asme b18.6.32024

ASME ASME (American Society of Mechanical Engineers) (ASME) adalah salah satu organisasi yang terkemuka di dunia, yang

asme b18.6.3length tolerance

ASME B18.6.3-2010 [Revision and Consolidation of ASME B18.6.3-2003 (R2008) and B18.6.4-2009] Machine Screws, Tapping Screws, and Metallic Drive Screws (Inch Series) A N A M E R I C A N N AT I O N A L STA N DA R D --`,,```,,,,````-`-`,,`,,`,`,,`--- Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Not for Resale --`,,```,,,,````-`-`,,`,,`,`,,`--- Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Not for Resale ASME B18.6.3-2010 [Revision and Consolidation of ASME B18.6.3-2003 (R2008) and B18.6.4-2009] Machine Screws, Tapping Screws, and Metallic Drive Screws (Inch Series) A N A M E R I C A N N AT I O N A L S TA N D A R D Three Park Avenue • New York, NY • 10016 USA --`,,```,,,,````-`-`,,`,,`,`,,`--- Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Not for Resale Date of Issuance: June 30, 2011 This Standard will be revised when the Society approves the issuance of a new edition. There will be no addenda issued to this edition. ASME issues written replies to inquiries concerning interpretations of technical aspects of this Standard. Periodically certain actions of the ASME B18.6.4 Committee may be published as Cases. Cases and interpretations are published on the ASME Web site under the Committee Pages at http://cstools.asme.org as they are issued. ASME is the registered trademark of The American Society of Mechanical Engineers. This code or standard was developed under procedures accredited as meeting the criteria for American National Standards. The Standards Committee that approved the code or standard was balanced to assure that individuals from competent and concerned interests have had an opportunity to participate. The proposed code or standard was made available for public review and comment that provides an opportunity for additional public input from industry, academia, regulatory agencies, and the public-at-large. ASME does not “approve,” “rate,” or “endorse” any item, construction, proprietary device, or activity. ASME does not take any position with respect to the validity of any patent rights asserted in connection with any items mentioned in this document, and does not undertake to insure anyone utilizing a standard against liability for infringement of any applicable letters patent, nor assumes any such liability. Users of a code or standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, is entirely their own responsibility. Participation by federal agency representative(s) or person(s) affiliated with industry is not to be interpreted as government or industry endorsement of this code or standard. ASME accepts responsibility for only those interpretations of this document issued in accordance with the established ASME procedures and policies, which precludes the issuance of interpretations by individuals. No part of this document may be reproduced in any form, in an electronic retrieval system or otherwise, without the prior written permission of the publisher. Copyright © 2011 by THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS All rights reserved Printed in U.S.A. Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Not for Resale --`,,```,,,,````-`-`,,`,,`,`,,`--- The American Society of Mechanical Engineers Three Park Avenue, New York, NY 10016-5990 CONTENTS Foreword . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Committee Roster . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Correspondence With the B18 Committee . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v vii viii 1 Introductory Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 2 General Data for Machine Screw and Tapping Screw Heads . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 3 General Data for Machine Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 4 General Data for Tapping Screws. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 5 General Data for Metallic Drive Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Figures 1 Types A, AB, B, BF, BP, and BT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Types C, D, G, T, and TRS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Type F . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Typical Torsional Strength Test Fixture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 6 6 9 --`,,```,,,,````-`-`,,`,,`,`,,`--- Tables 1 Dimensions of Slotted Flat Countersunk Head Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Recess Dimensions for Flat Countersunk Head Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Dimensions of Slotted 100-deg Flat Countersunk Head Screws (Machine Screws Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Recess Dimensions for 100-deg Flat Countersunk Head Screws (Machine Screws Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Dimensions of Slotted Close Tolerance 100-deg Flat Countersunk Head Screws (Machine Screws Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Recess Dimensions for Close Tolerance 100-deg Flat Countersunk Head Screws (Machine Screws Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Dimensions of Slotted Oval Countersunk Head Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Recess Dimensions for Slotted Oval Countersunk Head Screws . . . . . . . . . . . . . . . . . . . . 9 Dimensions of Slotted Undercut 82-deg Flat Countersunk Head Screws . . . . . . . . . . . . 10 Recess Dimensions for Undercut 82-deg Flat Countersunk Head Screws . . . . . . . . . . . . 11 Dimensions of Slotted Undercut Oval Countersunk Head Screws . . . . . . . . . . . . . . . . . . 12 Recess Dimensions for Undercut Oval 82-deg Countersunk Head Screws . . . . . . . . . . . 13 Dimensions of Flat Countersunk Trim Head Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Recess Dimensions for Flat Countersunk Trim Head Screws . . . . . . . . . . . . . . . . . . . . . . . 15 Dimensions of Oval 82-deg Countersunk Trim Head Screws . . . . . . . . . . . . . . . . . . . . . . . 16 Recess Dimensions for Oval 82-deg Countersunk Trim Head Screws . . . . . . . . . . . . . . . 17 Head Dimensions for Slotted Pan Head Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Dimensions of Type I Cross Recessed Pan Head Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Recess Dimensions for Pan Head Screws (Types IA, III, and VI) . . . . . . . . . . . . . . . . . . . . 20 Recess Dimensions for Combination Slotted-Pan Head Screws . . . . . . . . . . . . . . . . . . . . . 21 Dimensions of Slotted Fillister Head Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Recess Dimensions for Fillister Head Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 Dimensions of Slotted Drilled Fillister Head Screws (Machine Screws Only) . . . . . . . . 24 Dimensions of Slotted Truss Head Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 Recess Dimensions for Truss Head Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 Dimensions of Combination Slotted Truss Head Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 Dimensions of Slotted Binding Head Screws (Machine Screws Only) . . . . . . . . . . . . . . . 28 Recess Dimensions for Binding Head Screws (Machine Screws Only) . . . . . . . . . . . . . . . iii Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Not for Resale 11 13 15 16 17 18 19 21 23 24 25 27 28 29 30 33 34 35 36 37 39 40 42 43 44 46 48 49 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 Dimensions of Plain (Unslotted) and Slotted Regular and Large Hex Head Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Recess Dimensions for Indented Regular and Large Hex Head Screws . . . . . . . . . . . . . Recess Dimensions for Type I Nonindented Regular and Large Hex Head Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Dimensions of Plain and Slotted Hex Washer Head Screws . . . . . . . . . . . . . . . . . . . . . . . . Recess Dimensions for Indented Hex Washer Head Screws . . . . . . . . . . . . . . . . . . . . . . . . Recess Dimensions for Combination Slotted Type I Indented Hex Washer Head Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Dimensions of Slotted Round Head Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Recess Dimensions for Round Head Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Recess Dimensions for Combination Slotted Round Head Screws . . . . . . . . . . . . . . . . . . Dimensions of Slotted Round Washer Head Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Recess Dimensions for Round Washer Head Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Dimensions of Threads and Points for Types AB and ABR Thread-Forming Tapping Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Dimensions of Threads and Points for Types B and BP Thread-Forming Tapping Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Dimensions of Threads and Points for Type A Thread-Forming Tapping Screws . . . . Dimensions of Threads and Points for Types BF and BT Thread-Cutting Tapping Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Dimensions of Threads and Points for Types D, F, G, and T Thread-Cutting Tapping Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Dimensions of Type TRS Tapping Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Thread Lengths for Types A, AB, B, BF, BP, and BT Tapping Screws . . . . . . . . . . . . . . . . Thread Lengths for Types C, D, F, G, and T Tapping Screws . . . . . . . . . . . . . . . . . . . . . . . Standard Test-Plate Thickness and Hole Sizes for Drive-Test Inspection of Tapping Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Maximum Drive Torque for Type TRS Tapping Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Torsional Strength Requirements for Tapping Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Dimensions of Round Head Type U Metallic Drive Screws . . . . . . . . . . . . . . . . . . . . . . . . 50 52 53 54 56 57 58 59 60 62 63 64 65 66 67 68 70 71 72 73 74 75 76 Mandatory Appendices I Protrusion Gaging of Flat Countersunk Heads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . II Across-Corners Gaging of Hex Heads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . III Gaging of Recessed Heads, Types I, IA, and III . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . IV Wobble Gaging of Recessed Heads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . V Dimensions for No. 0000, No. 000, and No. 00 Thread Sizes . . . . . . . . . . . . . . . . . . . . . . . VI Dimensions of Type C Tapping Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . VII Type VI Recess Gage Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77 78 79 85 88 90 92 Nonmandatory Appendices A Dimensions of Header Points for Machine Screws Before Threading . . . . . . . . . . . . . . . . B Determination of Maximum Effective Design Grip Lengths . . . . . . . . . . . . . . . . . . . . . . . . C Formulas for Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D Approximate Hole Sizes for Tapping Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E Wrench Openings for Hex Head Screws, and Square and Hex Nuts . . . . . . . . . . . . . . . . 95 97 99 108 130 iv Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Not for Resale --`,,```,,,,````-`-`,,`,,`,`,,`--- 29 FOREWORD --`,,```,,,,````-`-`,,`,,`,`,,`--- American National Standards Committee B18 for the standardization of bolts, screws, nuts, rivets, and similar fasteners was organized in March 1922 as Sectional Committee B18 under the aegis of the American Engineering Standards Committee (later the American Standards Association, then the United States of America Standards Institute and, as of October 6, 1969, the American National Standards Institute, Inc.), with the Society of Automotive Engineers and the American Society of Mechanical Engineers as joint sponsors. Subcommittee 31 was subsequently established and charged with the responsibility for technical content of standards covering slotted and recessed head screws. An American Standard setting forth slotted head proportions was approved and published in April 1930. Over the years following the issuance of this document, the need for standards more comprehensive than head configurations became apparent. At a meeting held on April 14, 1942, Subcommittee 3 1 was reorganized and enlarged, and the following operating scope was established: The scope of Subcommittee 31 shall consist of the development and promulgation of American Standards embracing screw products variously known as machine screws, wood screws, tapping screws, slotted head cap screws, slotted headless set screws, and machine screw nuts. The standards shall comprise complete product standards covering all dimensions and tolerances required for the specification and production of the products. Details shall include boundary dimensions, such as nut width and thickness; screw head dimensions; slot and recess dimensions; body dimensions; thread classification or thread detail, as required; thread length; point design; chamfers; underhead fillets; and supporting general specifications covering the quality, finish, and the acceptable tolerances and limits as well as any information that may be necessary to ensure satisfactory application of the products. Several meetings of the Subcommittee over the ensuing 3 years resulted in the development and acceptance of a proposed revision containing complete product standards coverage for slotted and recessed head machine, tapping and wood screws; slotted and hexagon head cap screws; and slotted headless set screws. Following approval by the B18 Committee and sponsor organizations, this proposal was forwarded to the American Standards Association and declared an American Standard, ASA B18.6, on April 12, 1947. Recognizing the need for further refinements, Subcommittee 31 at a meeting held on February 1, 1951, established three standing working subgroups: one to develop details pertinent to tapping screw threads; a second to review, revise, and develop head dimensions and tolerances; and a third to correlate and edit the technical information emanating from the other two groups. Also at this meeting, numerous suggested changes were reviewed and assigned to the respective subgroups for further development. Additional meetings of the Subcommittee were held on October 9, 1952; October 29, 1953; and April 1 and 2, 1954. Between each of these meetings the subgroups held numerous working sessions and carried on technical development in cooperation with the technical committees of the U.S. Machine Screw and Tapping Screw Service Bureaus. At the April 1954 meeting, Subcommittee 3,1 contemplating a partial revision of the ASA B18.6 document, recommended the publication of standards for wood screws, cap and set screws, machine screws, and tapping and drive screws in four separate documents, each of which would consist of a complete product specification. This approach was confirmed by the B18 Committee with the further stipulation that the coverage for hexagon head cap screws, square head set screws, and machine screw nuts from the ASA B18.2 standard be transferred to the documents covering cap and set screws and machine screws, respectively. It was understood that jurisdiction over the square head set screws and hexagon head cap screws would remain with Subcommittee 2 and that Subcommittee 31 would retain responsibility for machine screw nuts. Following this 1 As of April 1, 1966, Subcommittee 3 was redesignated Subcommittee 6. v Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Not for Resale confirmation and additional direction, the preparation of proposals for the new documents was undertaken. The proposed standard covering slotted and recessed head machine screws and machine screw nuts was approved by Subcommittee 31 at a meeting held on December 6, 1955. After being circulated to industry for comment, it was revised and subsequently approved by letter ballot of the B18 Committee in March of 1958. The proposal was, however, redrafted to incorporate additional revisions and refinements adopted by Subcommittee 31 at meetings held on October 30, 1958 and September 17, 1959. The revised proposal was recirculated to the B18 Committee and was approved by the sponsor organizations and the American Standards Association and formally designated an American Standard, ASA B18.6.3, on February 12, 1962. Following issuance of the 1962 document, Subcommittee 31 and the working subgroups continued to develop revisions and refinements reflecting changes in industry practices and technical improvements. Work over the intervening years culminated in the Subcommittee 6 acceptance of a draft dated November 1969, incorporating revisions in the following areas: inclusion of Type IA cross recess data; addition of the No. 0000, No. 000, and No. 00 sizes to most slotted head styles; extensions of size coverage for 100 deg flat countersunk heads and binding heads in smaller sizes, and for pan heads in larger sizes; redimensioning of flat and oval countersunk heads; revision of thread lengths; inclusion of appendices for wobble gaging of recessed heads and wrench sizes for square and hex products; and a complete revamping of the format. This revision was approved as an American National Standard on May 22, 2003. In late 2008 the ASME B18.6 Subcommittee undertook a revision of B18.6.3. The first major decision was to combine B18.6.3 and B18.6.4 into one standard for all types of screws, machine and tapping. This was decided since over 50% of both standards were identical and they both contained essentially the same head and recess data. The Type VI recess design, having six internal lobes, was introduced into this standard because of its wide use. The Type I recess was removed from the standard because there is no documented use of this design today. A grade of hardened steel machine screw was added to the standard along with references to stainless steel and nonferrous materials. The thread Type TRS, for thread rolling screws, was added in the tapping screw section. The Type A thread type was moved back into the body of the standard from the Appendix because it is still in high use in several industries. The Type ABR thread, a Type AB with a radius point, was also introduced. Machine screw nuts were moved to ASME B18.2.2. This revision was approved as an American National Standard on September 8, 2010. --`,,```,,,,````-`-`,,`,,`,`,,`--- Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS vi Not for Resale ASME B18 COMMITTEE Standardization of Bolts, Nuts, Rivets, Screws, Washers, and Similar Fasteners (The following is the roster of the Committee at the time of approval of this Standard.) STANDARDS COMMITTEE OFFICERS J. Greenslade, Chair D. S. George, Vice Chair R. D. Strong, Vice Chair C. J. Gomez, Secretary W. H. Kopke, Consultant W. J. Lutkus, Emhart Technologies A. D. McCrindle, Canadian Fasteners Institute M. D. Prasad, Contributing Member, Global M&F Solutions, Inc. S. Savoji, ITW Medalist W. Schevey, Contributing Member, BGM Fastener Co., Inc. Q. M. Smith III, Oregon Department of Transportation W. R. Stevens, Ramco R. D. Strong, Consultant S. W. Vass, Consultant C. B. Wackrow, MNP Corp. W. K. Wilcox, Consultant C. B. Williamson, Fastenal Co. C. J. Wilson, Consultant R. B. Wright, Contributing Member, Wright Tool Co. J. G. Zeratsky, National Rivet and Manufacturing Co. V. Cartina, Autocraft Industrial D. A. Clever, Consultant A. P. Cockman, Ford Motor Co. C. A. Dugal de la Garza, TSP, Inc. D. S. George, Ramco Specialties C. J. Gomez, The American Society of Mechanical Engineers J. Greenslade, Industrial Fasteners Institute J. J. Grey, Contributing Member, Fastener Consulting Services, Inc. B. Hasiuk, Contributing Member, Defense Supply Center — Philadelphia A. Herskovitz, Consultant J. Hubbard, Leland-Powell Fasteners, Inc. J. Jennings, Contributing Member, Naval Surface Warfare Center W. H. King, Porteous Fastener Co. J. F. Koehl, Contributing Member, Spirol International Corp. SUBCOMMITTEE 6 — SLOTTED AND RECESSED HEAD SCREWS M. Keller, Consultant R. W. Kerr, Kerr Lakeside, Inc. W. H. King, Porteous Fastener Co. M. Levinson, ITW Shakeproof Industrial Products J. F. McCarrick, Defense Supply Center — Philadelphia R. B. Meade, Atrona Material Testing Laboratories, Inc. S. Savoji, ITW Medalist D. J. Soscia, General Dynamics Electric Boat Corp. K. Westphal, Kamax W. K. Wilcox, Consultant C. B. Williamson, Fastenal Co. C. J. Wilson, Consultant R. D. Strong, Chair, Consultant J. Hubbard, Vice Chair, Leland-Powell Fasteners, Inc. G. M. Simpson, Vice Chair, Semblex Corp. A. L. Guzman, Secretary, The American Society of Mechanical Engineers D. A. Clever, Consultant M. A. Elmi, Caterpillar J. S. Foote, Trade Association Management, Inc. D. S. George, Ramco Specialties J. Greenslade, Industrial Fasteners Institute A. Herskovitz, Consultant M. W. Holubecki, Electric Boat Corp. vii Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Not for Resale --`,,```,,,,````-`-`,,`,,`,`,,`--- STANDARDS COMMITTEE PERSONNEL CORRESPONDENCE WITH THE B18 COMMITTEE General. ASME Standards are developed and maintained with the intent to represent the consensus of concerned interests. As such, users of this Standard may interact with the Committee by requesting interpretations, proposing revisions, and attending Committee meetings. Correspondence should be addressed to Secretary, B18 Standards Committee The American Society of Mechanical Engineers Three Park Avenue New York, NY 10016-5990 http://go.asme.org/Inquiry Proposing Revisions. Revisions are made periodically to the Standard to incorporate changes that appear necessary or desirable, as demonstrated by the experience gained from the application of the Standard. Approved revisions will be published periodically. The Committee welcomes proposals for revisions to this Standard. Such proposals should be as specific as possible, citing the paragraph number(s), the proposed wording, and a detailed description of the reasons for the proposal, including any pertinent documentation. Proposing a Case. Cases may be issued for the purpose of providing alternative rules when justified, to permit early implementation of an approved revision when the need is urgent, or to provide rules not covered by existing provisions. Cases are effective immediately upon ASME approval and shall be posted on the ASME Committee Web page. Requests for Cases shall provide a Statement of Need and Background Information. The request should identify the Standard, the paragraph, figure or table number(s), and be written as a Question and Reply in the same format as existing Cases. Requests for Cases should also indicate the applicable edition(s) of the standard to which the proposed Case applies. Interpretations. Upon request, the B18 Standards Committee will render an interpretation of any requirement of the Standard. Interpretations can be rendered only in response to a written request sent to the Secretary of the B18 Standards Committee. The request for an interpretation should be clear and unambiguous. It is further recommended that the inquirer submit his/her request in the following format: Subject: Edition: Question: Cite the applicable paragraph number(s) and the topic of the inquiry. Cite the applicable edition of the Standard for which the interpretation is being requested. Phrase the question as a request for an interpretation of a specific requirement suitable for general understanding and use, not as a request for an approval of a proprietary design or situation. The inquirer may also include any plans or drawings that are necessary to explain the question; however, they should not contain proprietary names or information. --`,,```,,,,````-`-`,,`,,`,`,,`--- Requests that are not in this format may be rewritten in the appropriate format by the Committee prior to being answered, which may inadvertently change the intent of the original request. ASME procedures provide for reconsideration of any interpretation when or if additional information that might affect an interpretation is available. Further, persons aggrieved by an interpretation may appeal to the cognizant ASME Committee or Subcommittee. ASME does not “approve,” “certify,” “rate,” or “endorse” any item, construction, proprietary device, or activity. Attending Committee Meetings. The B18 Standards Committee regularly holds meetings that are open to the public. Persons wishing to attend any meeting should contact the Secretary of the B18 Standards Committee. viii Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Not for Resale ASME B18.6.3-2010 MACHINE SCREWS, TAPPING SCREWS, AND METALLIC DRIVE SCREWS (INCH SERIES) INTRODUCTORY NOTES 1.6 Comparison With ISO This Standard has no ISO counterpart. 1.1 Scope 1.7 Referenced Standards Unless otherwise specified, the standards referenced shall be the most recent at the time of order placement. This Standard is intended to cover the complete general and dimensional data for the various types of slotted and recessed head machine screws, tapping screws, and metallic drive screws recognized as American National Standard. Also included are appendices that provide specifications and instructions for the protrusion gaging of flat countersunk head screws; across-corners gaging of hex head screws; penetration gaging and wobble gaging of recessed head screws; approximate hole size for tapping screws; wrench openings for hex and square products; thread dimensions for the No. 0000, No. 000, and No. 00 sizes; means for determining effective grip lengths on screws; documentation for screw types and head types relegated to not-recommended or limited-usage status; and formulas on which dimensional data are based. It shall be understood, however, that where questions arise concerning acceptance of product, the dimensions in the tables shall govern over recalculation by formula. The inclusion of dimensional data in this Standard is not intended to imply that all of the products described are stock production sizes. Consumers should consult with suppliers concerning the availability of products. ASME B1.1, Unified Inch Screw Threads (UN and UNR Thread Form) ASME B1.3, Screw Thread Gaging Systems for Acceptability: Inch and Metric Screw Threads (UN, UNR, UNJ, M, and MJ) ASME B18.2.9, Straightness Gage and Gaging for Bolts and Screws ASME B18.12, Glossary of Terms for Mechanical Fasteners ASME B18.18.2, Inspection and Quality Assurance for High-Volume Machine Assembly Fasteners ASME B18.24, Part Identifying Number (PIN) Code System for B18 Fastener Products Publisher: The American Society of Mechanical Engineers (ASME), Three Park Avenue, New York, NY 10016-5990; Order Department: 22 Law Drive, P.O. Box 2900, Fairfield, NJ 07007-2900 (www.asme.org) ASTM F 1941, Specification for Electrodeposited Coatings on Threaded Fasteners [Unified Inch Screw Threads (UN/UNR)] Publisher: American Society for Testing and Materials (ASTM International), 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA, 19428-2959 (www.astm.org) 1.2 Dimensions All dimensions in this Standard are given in inches, unless stated otherwise. 1.3 Options SAE J423, Methods of Measuring Case Depth Publisher: SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001 (www.sae.org) Options, where specified, shall be at the discretion of the manufacturer unless otherwise agreed upon by the manufacturer and the purchaser. 1.8 Inspection and Quality Assurance Unless otherwise specified, acceptability to this Standard shall be determined in accordance with ASME B18.18.2. 1.4 Responsibility for Modification The manufacturer shall not be held responsible for malfunctions of product determined to be due to plating or other modifications when such plating or modification is not accomplished under the manufacturer’s control or direction. 2 1.5 Terminology GENERAL DATA FOR MACHINE SCREW AND TAPPING SCREW HEADS 2.1 Heads For definitions of terms relating to fasteners or features thereof used in this Standard, refer to ASME B18.12. 2.1.1 Head Height. All dimensions pertaining to head height specified in the dimensional tables shall be 1 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Not for Resale --`,,```,,,,````-`-`,,`,,`,`,,`--- 1 ASME B18.6.3-2010 Unless specified by the purchaser, the slot width may be slightly tapered from the bottom to the top, or straight, at the option of the manufacturer. measured parallel to the axis of the screw, and those relating to the top of the head shall represent a metalto-metal measurement. In other words, any truncation of rounded head contours due to the slot or recess shall not be considered part of the head height. Total or overall head heights shall be measured from the top of the head to the plane of the bearing surface for flat bearing surface type heads, to the plane of the undercut for undercut countersunk heads, and to the junction of the conical bearing surface with the basic screw diameter for countersunk heads. Head side heights shall be measured from the theoretical intersection of the top surface of the head with the head diameter to the plane of the bearing surface for flat bearing surface type heads, to the plane of the undercut for undercut countersunk heads, and to the junction of the conical bearing surface with the basic screw diameter for countersunk heads. On countersunk heads, the junction of the conical bearing surface with the basic screw diameter may not necessarily be the same as the actual junction of the head with the shank and the head height delineating the conical bearing surface is a reference dimension. 2.1.5 Feature Positional Tolerances. The positional relationship of the heads and driving provisions of screws with respect to the shanks of screws (formerly defined as “eccentricity”) shall be as follows: (a) True Position of Head. The axis of the head shall be located at true position relative to the axis of the screw shank within a tolerance zone having a diameter equivalent to 6% of the specified maximum head diameter, or maximum width across flats of hex and hex washer heads, regardless of feature size. (b) True Position of Recess. The recess in cross recessed head screws shall be located at true position relative to the axis of the screw shank within a tolerance zone having a diameter equivalent to 12% of the basic screw diameter or 0.030 in., whichever is greater, regardless of feature size. (c) True Position of Slot. The slot in slotted head screws shall be located at true position relative to the axis of the screw shank within a tolerance zone having a diameter equivalent to 12% of the basic screw diameter or 0.020 in., whichever is greater. 2.1.2 Bearing Surface. The bearing surface of flat bearing surface type machine screw heads shall be perpendicular to the axis of the screw shanks within 2 deg. 2.1.6 Underhead Fillets. The radius of the fillet under countersunk head screws shall be no greater than 40% of the basic screw diameter. The radius of the fillet under truss heads and No. 6-sized pan heads shall be no greater than 25% of the basic screw diameter. The radius of the fillet under all other head styles shall be no greater than 15% of the basic screw diameter. Screws shall have a definite underhead fillet large enough to ensure that full fastener strength is achieved. 2.1.3 Gaging of Recesses 2.1.3.1 Penetration Gaging. The penetration gaging depth of the recess in recessed head screws shall be the primary inspection criteria. It is measured, parallel to the axis of screw, from the intersection of the maximum diameter of the recess with the head surface to the point at which penetration gage bottoms in the recess. Recess gaging values are included in the respective dimensional tables. The gaging method and specifications for gages are contained in Mandatory Appendix III for Types I, IA, and III; and Mandatory Appendix VII for Type VI recesses. 2.2 Screw Head Types The head types covered by this Standard include those commonly recognized as being applicable to machine screws and tapping screws and are enumerated and described in paras. 2.2.1 through 2.2.12. 2.1.3.2 Wobble Gaging. Recess wobble gages, gaging procedures, and permissible limits for recess Types I, IA, and III are given in Mandatory Appendix IV. 2.2.1 Flat Countersunk Head. The flat countersunk head has a flat top surface and a conical bearing surface with a head angle for one style of approximately 82 deg and for another style of approximately 100 deg. Dimensions are given in Tables 1 through 4. Dimensions of close tolerance 100-deg flat countersunk heads are given in Tables 5 and 6. 2.1.4 Slot 2.1.4.1 Slot Depth. The depth of the slot in slotted head screws shall be measured, parallel to the axis of screw, from the top of the head to the intersection of the bottom of the slot with the head surface or bearing surface. 2.2.2 Oval Countersunk Head. The oval countersunk head has a rounded top surface and a conical bearing surface with a head angle of approximately 82 deg. Dimensions are given in Tables 7 and 8. 2.1.4.2 Slot Width. The width of the slot shall be measured perpendicular to the axis of the screw, from the theoretical intersection of the bottom and one side of the slot, to the theoretical intersection of the bottom and the other side of the slot. 2.2.3 Undercut Flat and Oval Countersunk Heads. For short lengths, 82-deg flat and oval countersunk head screws have heads undercut to 70% of normal side height 2 --`,,```,,,,````-`-`,,`,,`,`,,`--- Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Not for Resale ASME B18.6.3-2010 2.2.12 Round Washer Head. The round washer head has a semielliptical top surface formed integrally with a flat washer that projects beyond the crown of the head and provides a flat bearing surface. Dimensions are given in Tables 38 and 39. to afford greater length of thread on the screws. Dimensions are given in Tables 9 through 12. 2.2.4 Flat and Oval Countersunk Trim Heads. Flat and oval countersunk trim heads are similar to the 82 deg flat and oval countersunk heads except that the size of head for a given size screw is one or two sizes smaller than the regular flat and oval countersunk head size, and oval countersunk trim heads have a controlled radius where the curved top surface meets the conical bearing surface. Trim heads are furnished only in cross recessed head types. Dimensions are given in Tables 13 through 16. 3 3.1 Threads 3.1.1 Uncoated Threads. Unless otherwise specified, threads for sizes No. 0 through 3⁄4 in. shall conform to the requirements of Class 2A according to ASME B1.1. Threads for sizes No. 0000, No. 000, and No. 00 shall conform to the requirements in Mandatory Appendix V. 2.2.5 Pan Head. The slotted pan head has a flat top surface rounded into cylindrical sides and a flat bearing surface. The recessed pan head has a rounded top surface blending into cylindrical sides and a flat bearing surface. Dimensions are given in Tables 17 through 20. 3.1.2 Coated or Plated Threads. Unless otherwise specified, coated or plated threads shall be accepted based on the high limits of Class 3A (GO) and the low limits of Class 2A (NO GO). 2.2.6 Fillister Head. The fillister head has a rounded top surface, cylindrical sides, and a flat bearing surface. Dimensions are given in Tables 21 and 22. Dimensions of drilled fillister head machine screws are given in Table 23. 3.1.3 Thread Acceptance. Thread acceptance shall be determined using System 21 in ASME B1.3. 3.2 Machine Screw Length of Thread Machine screws shall have thread lengths conforming to the following (on screws threaded full length, the distance to the first full-form thread shall be measured, parallel to the axis of screw, from the bearing surface of the head to the face of a nonchamfered or noncounterbored special 3A GO thread ring gage assembled by hand as far as the thread will permit): (a) Sizes No. 5 and Smaller. Screws of nominal lengths equal to three diameters and shorter shall have full-form threads extending to within one pitch (thread) of the bearing surface of the head, or closer, if practicable. Nominal lengths greater than three diameters, up to and including 11⁄8 in., shall have full-form threads extending to within two pitches (threads) of the bearing surface of the head, or closer, if practicable. Screws of longer nominal lengths shall, unless otherwise specified, have a minimum length of full-form thread of 1 in. (b) Sizes No. 6 and Larger. Screws of nominal lengths equal to three diameters and shorter shall have full-form threads extending to within one pitch (thread) of the bearing surface of the head, or closer, if practicable. Nominal lengths greater than three diameters, up to and including 2 in., shall have full-form threads extending to within two pitches (threads) of the bearing surface of the head, or closer, if practicable. Screws of longer nominal lengths shall, unless otherwise specified, have a minimum length of full-form thread of 1.50 in. 2.2.7 Truss Head. The truss head has a low rounded top surface with a flat bearing surface, the diameter of which for a given screw size is larger than the diameter of the corresponding pan head. Dimensions are given in Tables 24 through 26. 2.2.8 Binding Head. The binding head has a rounded top surface and slightly tapered sides. The bearing surface is flat and, where so specified by the purchaser, slotted heads shall have an annular undercut adjacent to the shank. Binding heads are applicable only to machine screws. Dimensions are given in Tables 27 and 28. --`,,```,,,,````-`-`,,`,,`,`,,`--- 2.2.9 Hex Head. The hex head has a flat or indented top surface, six flat sides, and a flat bearing surface. Dimensions for regular and large heads are given in Tables 29 through 31. 2.2.10 Hex Washer Head. The hex washer head has an indented top surface and six flat sides formed integrally with a flat washer that projects beyond the sides and provides a flat bearing surface. Dimensions are given in Tables 32 through 34. 2.2.11 Round Head. The round head has a semielliptical top surface and a flat bearing surface. In recognition of the superior slot-driving characteristics of pan head screws over round head screws, and the overlap in the dimensions of cross recessed pan heads and round heads, it is recommended that pan head screws be used in new designs and, wherever possible, substituted in existing designs. Dimensions of round head screws are given in Tables 35 through 37. 3.3 Machine Screw Length Measurement The nominal length of screw, L, shall be measured, parallel to the axis of screw, from the extreme point to the plane of the bearing surface for screws having perpendicular bearing surface type heads, and to the 3 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS GENERAL DATA FOR MACHINE SCREWS Not for Resale ASME B18.6.3-2010 3.8.2 Carbon Steel — Hardened. When hardened machine screws are specified, they shall be made from low or medium carbon steel, through hardened to Rockwell C25-32. theoretical intersection of the top surface of head with the head diameter for screws having countersunk type heads. For all oval heads, the overall length, Lo, shall be measured, parallel to the axis of the screw, from the extreme point to the top of the head, where 3.8.3 Stainless Steel. When specified, stainless steel screws shall comply with the chemical requirements of ASTM F 837. Lo (overall length) p L (nominal length) + C (head crown height) 3.8.4 Nonferrous. When specified, nonferrous screws shall comply with the chemical requirements of ASTM F 468. 3.4 Machine Screw Tolerance on Length The length tolerance shall apply to Lo for all oval heads and to L for all other head styles. The tolerance on the length of machine screws shall conform to the following for the respective screw types: 3.9 Machine Screw Finish Unless otherwise specified, screws shall be supplied with a natural (as processed) finish, unplated or uncoated. When plating is specified, it shall conform to the requirements of ASTM F 1941. When other coatings are specified, the requirements shall be agreed upon by the supplier and the purchaser. Tolerance on Length for Nominal Screw Size Nominal Screw Length 0000 Through 00 Up to 1⁄2 in., inclusive Over 1⁄2 in. to 1 in., inclusive Over 1 in. to 2 in., inclusive Over 2 in. 0 Through 12 −0.01 −0.02 ... ... −0.02 −0.03 −0.06 −0.09 1 ⁄4 Through 3 ⁄4 −0.03 −0.03 −0.06 −0.09 3.10 Machine Screw Workmanship Screws shall not contain an excess of surface imperfections that might affect their serviceability, such as burrs, seams, laps, loose scale, and other irregularities. NOTE: Machine screws can be made to any length, but they are generally produced in fractional length increments of 1⁄16 in. for screws up to 5⁄8 in. long, 1⁄8 in. for screws over 5⁄8 in. through 11⁄2 in. long, and 1⁄4 in. for screws over 11⁄2 in. long. 3.11 Machine Screw Designation (a) Machine screws shall be designated by the following data, preferably in the sequence shown: (1) product name, including head type and driving provision and designation of the standard (2) nominal size (number, fraction, or decimal equivalent) (3) threads per inch (4) nominal length (fraction or decimal equivalent) (5) header point, if desired (6) material (7) protective coating, if required 3.5 Machine Screw Diameter of Body The diameter of body on machine screws having other than trim heads shall not be less than the Class 2A thread minimum pitch diameter nor greater than the basic major diameter of the thread. NOTE: Trim head screws not threaded to the head shall have a shoulder of 0.062 in. min. length under the head with diameter limits as specified in the dimensional tables. 3.6 Machine Screw Points Unless otherwise specified, machine screws shall have plain sheared ends. When chamfered points are specified by the purchaser, the point diameter shall be slightly under the minimum minor diameter and the chamfer length shall be one to two thread pitches in length. EXAMPLES: (1) Slotted pan head machine screws, ASME B18.6.3, 1⁄4 − 20 ⴛ 11⁄4, carbon steel, zinc plated per ASTM F 1941 Fe/Zn 3A. (2) Type IA cross recessed fillister head machine screw, ASME B18.6.3, 6 − 32 ⴛ 3⁄4, UNS C46200 brass per ASTM F 468. (3) Hexagon washer head machine screw, ASME B18.6.3, 0.375 − 16 ⴛ 1.50, carbon steel. (4) Type I cross recessed flat countersunk head machine screw, ASME B18.6.3, 0.190 − 24 ⴛ 1.50, carbon steel, phosphate/oil per ASTM E 1137 Grade 0D. 3.7 Machine Screw Straightness Straightness shall be determined using the gaging practices in B18.2.9. For lengths 12 in. and shorter, the tolerance shall be 0.006 in. per inch, and for lengths 24 in. and shorter but greater than 12 in., the tolerance shall be 0.008 in. per inch. For information of a typical gage design and an inspection procedure, consult ASME B18.2.9. (b) For a recommended part identifying number (PIN) system for machine screws, see ASME B18.24. 4 GENERAL DATA FOR TAPPING SCREWS 3.8 Machine Screw Material 4.1 Tapping Screw Types and Application 3.8.1 Carbon Steel — Unhardened. Unless otherwise specified, machine screws shall be non-heat-treated carbon steel with a hardness of Rockwell B69-100. Screws covered by this Standard and the appendices include tapping screws of the thread-forming, thread-cutting, and thread-rolling varieties, and metallic 4 --`,,```,,,,````-`-`,,`,,`,`,,`--- Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Not for Resale ASME B18.6.3-2010 drive screws. The type designations, descriptions, and applications are detailed in paras. 4.1.1 through 4.1.3. undesirable or where excessive driving torques are encountered with thread-forming screws. They shall be of the types described in paras. 4.1.2.1 and 4.1.2.2. 4.1.1 Thread-Forming Tapping Screws. Threadforming tapping screws are generally for application in materials where large internal stresses are permissible, or desirable, to increase resistance to loosening. They shall be of the types described in paras. 4.1.1.1 through 4.1.1.5. 4.1.1.1 Types AB and ABR. Type AB tapping screws shall have spaced threads, with the same pitches as Type B, and a gimlet point. They are primarily intended for use in thin metal, resin-impregnated plywood, and asbestos compositions. Type AB screws, because they offer wider versatility of application, are recommended over Type A screws. If a nonsharp point is specifically required, designate the screws as “ABR.” Dimensions for Types AB and ABR are given in Table 40. 4.1.2.2 Types D (1), F, G, and T (23). Types D, F, G, and T tapping screws shall have threads of machine screw diameter-pitch combinations approximating Unified Form with a blunt point and tapered entering threads having one or more cutting edges and chip cavities. The tapered threads of the Type F screw may be complete or incomplete at the manufacturer’s option; all other types shall have incomplete tapered threads. Types D, F, G, and T tapping screws are not subject to thread gaging but shall meet the dimensions specified in Table 44. These screws are intended for use in materials such as aluminum, zinc, and lead die castings; steel sheets and shapes; cast iron; brass; plastics; etc. 4.1.1.2 Type B. Type B tapping screws shall have spaced threads and a blunt point with incomplete entering threads. They are intended for use in materials such as thin metal, nonferrous castings, plastics, resinimpregnated plywood, and asbestos compositions. Dimensions are given in Table 41. 4.1.1.3 Type BP. Type BP tapping screws shall have spaced threads the same as Type B but shall have a conical point extending beyond the incomplete entering threads. They are intended for piercing fabrics or for use in assemblies where holes may be misaligned. Dimensions are given in Table 41. 4.1.3 Thread-Rolling Tapping Screws — Type TRS. Thread-rolling tapping screws shall have threads of machine screw diameter-pitch combinations approximating Unified Form with a blunt point, tapered entering threads, and some type of out-of-round-portion feature in the body and/or the tapered entering threads for displacing material in the application to form a mating internal thread without generating any chips. Thread-rolling tapping screws are generally for application in materials where the installer wishes to have a thread engagement longer than one screw diameter, they do not wish to create chips during installation, and/or they wish to maximize the difference between the amount of torque it takes to drive the screw up to its seating position and the torque required to fail the application either by screw breaking or thread stripping. Thread-rolling screws are installed in untapped holes larger than the comparable thread-cutting screws because thread-rolling screws uniformly displace the mating material instead of cutting it to create the internal thread. Dimensions are given in Table 45. 4.1.1.4 Type A. Type A tapping screws shall have coarse-spaced threads and a gimlet point. They are primarily intended for use in thin metal, resin-impregnated plywood, and asbestos compositions. Dimensions are given for reference purposes in Table 42. 4.1.1.5 Type C. Type C tapping screws shall have threads of machine screw diameter-pitch combinations approximating Unified Form with a blunt point and tapered, incomplete entering threads. Type C tapping screws are not subject to thread gaging but shall meet all dimensional requirements specified herein. They are intended for application where the use of a machine screw pitch thread is preferable to the use of the spacedthread types of thread-forming screws, or where chips from machine screw pitch thread-cutting screws are objectionable. In view of the declining use of Type C screws, which in general require high driving torques, in favor of more efficient designs of thread-rolling tapping screws, they are not recommended for new design. Accordingly, the dimensions are documented in Mandatory Appendix VI. 4.2 Threads and Points The threads and points applicable to screws covered by this Standard are generally described under subsection 4.1. Types B, BP, BF, BT, C, D, F, G, T, and TRS tapping screws shall have tapered entering threads from a diameter slightly less than the thread minor diameter. Point taper length is the length from the pointed end to the first fully formed thread at the major diameter as 4.1.2 Thread-Cutting Tapping Screws. Thread-cutting tapping screws are generally for application in materials where disruptive internal stresses are 5 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Not for Resale --`,,```,,,,````-`-`,,`,,`,`,,`--- 4.1.2.1 Types BF and BT (25). Types BF and BT tapping screws shall have spaced threads with a blunt point and tapered entering threads, as on Type B, with one or more cutting edges and chip cavities. The tapered threads of the Type BF screw may be complete or incomplete at the manufacturer’s option; all other types shall have incomplete tapered threads. These screws are intended for use in plastics, asbestos, and other similar compositions. Dimensions are given in Table 43. ASME B18.6.3-2010 Fig. 1 Types A, AB, B, BF, BP, and BT Y 90-deg Head Screws Fig. 2 Types C, D, G, T, and TRS Y Y Y 90-deg Head Screws Flat and Oval Countersunk Head Screws determined by the distance that the point enters into a cylindrical NO GO major diameter ring gage. For other details and dimensions, refer to the tables covering the respective screw types. Flat and Oval Countersunk Head Screws Fig. 3 Type F Y Y 4.3 Tapping Screw Length of Thread Tapping screws shall have thread lengths conforming to the specifications detailed in paras. 4.3.1 through 4.3.3. 4.3.1 Types A, AB, B, BF, BP, and BT. For screws of nominal lengths equal to or shorter than the nominal screw lengths, L, listed in Table 46, the full-form threads shall extend close to the head such that the minor diameter limits of the specified thread are maintained to within Y distance from the underside of the head, or closer if practicable. See Fig. 1. Screws of nominal lengths, L, longer than those tabulated in Table 46 shall, unless otherwise specified by the purchaser, have a minimum length of full-form thread as shown in the “LT Min.” column of Table 47. 90-deg Head Screws unthreaded length limits from the underside of the head, or closer if practicable. See Fig. 3. Screws of nominal lengths longer than those tabulated under the “Partially Threaded” column of Table 47 shall, unless otherwise specified by the purchaser, have a minimum length of full-form thread as shown in the “LT Min.” column. 4.3.2 Types C, D, G, T, and TRS. For screws of nominal lengths within the ranges listed under the “Fully Threaded” column of Table 47, full-form threads shall extend to within the respective Y max. unthreaded length limits from the underside of the head, or closer if practicable. Unthreaded length Y represents the distance, measured parallel to the axis of the screw, from the underside of the head to the face of a non-chamfered or non-counterbored thread ring set to Class 3A GO limits, assembled by hand as far as the thread will permit. See Fig. 2. Screws of nominal lengths longer than those tabulated under the “Partially Threaded” column of Table 47 shall, unless otherwise specified by the purchaser, have a minimum length of full-form thread as shown in the “LT Min.” column. 4.4 Tapping Screw Diameter of Body --`,,```,,,,````-`-`,,`,,`,`,,`--- 4.4.1 Types A, AB, B, BP, BF, and BT tapping screw body diameters shall not be less than the minimum minor diameter nor greater than the maximum major diameter of the thread, except for trim head screws. Trim head screws not threaded to head shall have a shoulder of 0.062 in. min. length under the head with diameter limits as specified in the dimensional tables. At the manufacturer’s option, the specified shoulder diameter may extend the entire length from the head to the thread. 4.3.3 Type F. For screws of nominal lengths within the ranges listed under the “Fully Threaded” column of Table 47, the full-form threads shall extend close to the head such that the major diameter limits of the specified thread are maintained to within the respective Y max. 4.4.2 Types C, D, F, G, T, and TRS tapping screw body diameters shall not be less than the Class 2A thread minimum pitch diameter nor greater than the maximum major diameter of the thread. 6 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Flat and Oval Countersunk Head Screws Not for Resale ASME B18.6.3-2010 4.8 Tapping Screw Materials Trim head screws not threaded to head shall have a shoulder of 0.062 in. min. length under the head with diameter limits as specified in the dimensional tables. At the manufacturer’s option, the specified shoulder diameter may extend the entire length from the head to the thread. 4.8.1 Steel. Tapping screws are fabricated from medium carbon steel, case hardened to meet the performance requirements set forth in these specifications. At the option of the manufacturer, the steel shall be killed or capped but not rimmed. 4.5 Tapping Screw Length Screw Size 4.5.1 Measurement. The nominal length of the screw, L, shall be measured, parallel to the axis of the screw, from the extreme point to the plane of the bearing surface for screws having perpendicular bearing surface type heads, and to the theoretical intersection of the top surface of the head with the head diameter for screws having countersunk type heads. For all oval heads, the overall length, Lo, shall be measured, parallel to the axis of the screw, from the extreme point to the top of the head, where No. 4 and smaller No. 5 and larger Carbon by % Wt. Manganese by % Wt. 0.11–0.27 0.13–0.27 0.57–1.71 0.64–1.71 NOTE: All material requirements come directly from SAE J933. 4.8.1.1 Core Hardness. Screws shall have a core hardness of Rockwell C28-38. Hardness shall not exceed the maximum shown and preferably should be no higher than Rockwell C36 to ensure against failure in assembly and service. Lo (overall length) p L (nominal length) + C (head crown height) 4.8.1.2 Case Hardness. Screws shall have a minimum case hardness of Rockwell C45. 4.6 Tapping Screw Tolerance on Length 4.8.1.3 Total Case Depth. Screws shall have a total case depth conforming to the following table, when tested as specified in SAE J423. At the maximum case depth, the hardness must not exceed Rockwell C42. The length tolerance shall apply to Lo for all oval heads and to L for all other head styles. The tolerance on the length of tapping screws shall conform to the specifications detailed in paras. 4.6.1 and 4.6.2 for the respective screw types. Min. Max. Tolerance on Length No. 2 through No. 6 No. 8 and No. 10 1 ⁄4 and larger 0.002 0.004 0.005 0.007 0.009 0.011 Up to 1 in., inclusive Over 1 in. ±0.03 ±0.05 4.8.2 Other Materials. When specified, tapping screws may be made from other materials. The material and properties shall be agreed to by the supplier and the purchaser. 4.6.2 Types B, BF, BT, C, D, F, G, T, and TRS. The tolerance on length shall be as tabulated below. Nominal Screw Length 3 Up to ⁄4 in., inclusive Over 3⁄4 in. to 11⁄2 in., inclusive Over 11⁄2 in. Tolerance on Length −0.03 −0.05 −0.06 4.9 Tapping Screw Finish Unless otherwise specified, screws shall be supplied with a natural (as processed) finish, unplated or uncoated. When plating is specified, it shall conform to the requirements of ASTM F 1941. When other coatings are specified, the requirements, such as recess fill, thread acceptability, etc., shall be agreed upon by the supplier and the purchaser. For Type TRS screws, all electroplated finishes must have an additional lubrication such as a wax top coating. NOTE: Tapping screws can be made to any length, but they are generally produced in fractional length increments of 1⁄16 in. for screws up to 1⁄2 in. long, 1⁄8 in. for screws over 1⁄2 in. through 11⁄2 in. long, 1⁄4 in. for screws over 11⁄2 in. through 3 in. long, and 1⁄2 in. for screws over 3 in. long. 4.7 Tapping Screw Straightness Straightness shall be determined using the gaging practices in ASME B18.2.9. For lengths 12 in. and shorter, the tolerance shall be 0.006 in. per inch, and for lengths 24 in. and shorter but greater than 12 in., the tolerance shall be 0.008 in. per inch. For information on a typical gage design and an inspection procedure, consult ASME B18.2.9. 4.10 Tapping Screw Workmanship Screws shall not contain an excess of surface imperfections that might affect their serviceability, such as burrs, seams, laps, loose scale, and other irregularities. 7 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Not for Resale --`,,```,,,,````-`-`,,`,,`,`,,`--- Nominal Screw Length Total Case Depth, in. Nominal Size 4.6.1 Types A, AB, and BP. The tolerance on length shall be as tabulated below ASME B18.6.3-2010 4.11 Performance Tests fixture for conducting torsional strength tests on tapping screws is depicted in Fig. 4. The acceptability of carbon steel tapping screws shall be determined by subjecting the screws to the applicable tests specified in paras. 4.11.1 through 4.11.5. 4.11.4 Ductility Test. The sample screw shall be inserted into a hole in a hardened 10-deg wedge block or other suitable device. The hole shall be 0.020 in. to 0.040 in. larger than the nominal screw diameter. An axial compressive load shall be applied against the top of the screw head and continued until the plane of the underhead bearing surface is permanently bent with respect to a plane perpendicular to the axis of the screw. This may be accomplished utilizing a hammer and applying a single or repeated blows, as necessary, to achieve a permanent bend. Head separation shall be cause for rejection. 4.11.1 Drive Test. All tapping screws except Types BF and BT shall be driven into standard test plates as specified in Table 48. Tapping screws shall be driven into test plates, forming or cutting a mating thread until the tapered threads of the point are completely through the test plate. The screw points and tapered threads shall not exhibit any deformation. The test-hole sizes specified in Table 48 were predicated originally on the testing of plain finish (uncoated or unplated) screws. Subsequent experience has shown these hole sizes to be satisfactory for the testing of screws having most types of commercial finishes. However, some finishes, heavy coatings in particular, alter the performance characteristics of the screws. Where screws with such finishes fail the test, they shall be stripped of plating, baked, lubricated with machine oil, and retested in the plain finish condition. If screws so tested pass the test, it will be determined that they are acceptable, and the problem arising from the finish shall be subject to resolution between the manufacturer and the purchaser. In cases where screws are plated subsequent to delivery to the purchaser, or where plating of screws is otherwise under the control of the purchaser, the screw manufacturer shall not be held responsible for failures due to plating. 4.11.5 Hydrogen Embrittlement Test. Electroplated screws shall be installed into a steel test plate as specified in Table 48 with the head of the screw seated against a standard steel flat washer or stack of washers to keep the head angle of countersunk heads and the thread runout from engaging the top surface of the test plate. For longer screws having an unthreaded shank portion, steel spacers, of a length that will ensure that full-form thread engagement is maintained within the test-plate thickness, shall be used between the screw head and the test plate. Drive five screws to failure (i.e., screw breakage into two or more parts) and average the failure values. Tighten sample screws to 80% of the average failure torque. The screws shall be allowed to remain in this tightened state for a period of 24 hr. The original embrittlement test torque shall then be reapplied, and there shall be no evidence of screw failure. 4.11.2 Type TRS Drive Torque Test. When performing the drive test using Type TRS screws, the maximum torque to drive the tapered threads completely through the test plate shall be recorded and shall not exceed the values shown in Table 49 regardless of their finish or coating. Speed of driving the screws shall not exceed 500 rotations per minute (rpm). In the event of dispute, the speed of 30 rpm shall be used for referee purposes. (a) Tapping screws shall be designated by the following data in the sequence shown: (1) nominal size (number, fraction, or decimal equivalent) (2) threads per inch (3) nominal length (fraction or decimal equivalent) (4) point type (5) product name, including head type and driving provision (6) material (7) protective finish, if required 4.11.3 Torsional Strength Test. Screws shall be securely clamped by suitable means such that the clamped portion of threads are not damaged and that at least two full threads project above the clamping device, and that at least two full threads exclusive of point, flutes, or end slot are held within the clamping device. (A blind hole may be used in place of a threaded clamping device, provided the hole depth is such as to ensure that breakage will occur beyond the point or the full length of the flutes or end slot.) By means of a suitably calibrated torque-measuring device, torque shall be applied to the screw until failure occurs. The torque required to twist the screw into two pieces shall be no less than the minimum value given in Table 50 for the type and size of screw being tested. A typical EXAMPLES: (1) Slotted pan head tapping screw, ASME B18.6.3, 1⁄4 − 14 ⴛ 11⁄4, Type AB, steel plated zinc per ASTM F 1941 Zn/Fe 3A. (2) Type 1 cross recessed pan head tapping screw, ASME B18.6.3, 6 − 32 ⴛ 3⁄4, Type F, corrosion-resistant steel per UNS 30200, passivated per ASTM A380. (b) Until ASME B18.24 is revised, the part identifying numbers will be listed under B18.6.4 rather than B18.6.3. 8 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Not for Resale --`,,```,,,,````-`-`,,`,,`,`,,`--- 4.12 Tapping Screw Designation ASME B18.6.3-2010 Fig. 4 Typical Torsional Strength Test Fixture 4.13 Tapping Screw Assembly Considerations 5.2 Drive Screw Length of Thread The finish (plating or coating) on tapping screws and the material composition and hardness of the mating component are factors that affect assembly torques in individual applications. Although the recommended hole sizes shown in Nonmandatory Appendix D were originally based on the use of plain unfinished carbon steel screws, experience has since proven that the specified holes are also suitable for screws having most types of commercial finishes. However, it should be noted that, due to various finishes providing different degrees of lubricity, some adjustment of installation torques may be necessary to suit individual applications. Also, where exceptionally heavy finishes are involved or screws are to be assembled into materials of higher hardness, some deviation from the specified hole sizes may be required to provide optimum assembly. The necessity and extent of such deviations can best be determined by experiment in the particular assembly environment. Type U metallic drive screws shall have fully formed threads extending from the base of pilot to the head except that threads at the starting end and under the head may be incomplete for a length equal to one-half of the maximum screw diameter, due to the natural flow of material in the thread-forming operation. 5 5.3 Drive Screw Points Type U metallic drive screws shall have a pilot point. The blunt end of the pilot may be slightly angular, as depicted in the illustration in Table 51, due to the natural flow of material in the cutoff process. 5.4 Drive Screw Tolerance on Length The tolerance on length of Type U metallic drive screws shall be as tabulated below. Nominal Screw Length 3 Up to ⁄8 in., inclusive Over 3⁄8 in. GENERAL DATA FOR METALLIC DRIVE SCREWS Metallic drive screws are designated Type U. They shall have multiple start threads of a large helix angle with a pilot point. These screws are intended for making permanent fastenings in metals and plastics, when forced into the work under pressure. Dimensions are given in Table 51. 5.5.1 Steel. Unless otherwise specified, Type U metallic drive screws shall be made of carbon steel suitably hardened to meet the performance requirements specified herein. 5.5.2 Other Materials. When specified, drive screws may be made from other materials; the materials and properties shall be agreed to by the supplier and purchaser. Type U metallic drive screws shall have multiple start threads, as specified for the respective screw size, with a helix angle of 45 deg to 65 deg. Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS ±0.02 ±0.03 5.5 Drive Screw Material 5.1 Drive Screw Threads --`,,```,,,,````-`-`,,`,,`,`,,`--- Tolerance on Length 9 Not for Resale ASME B18.6.3-2010 5.6 Test Requirements (1) nominal size (number, fraction, or decimal equivalent) (2) nominal length (fraction or decimal equivalent) (3) product name, including head type (4) material (5) protective finish Type U metallic drive screws shall be driven into steel test plates having a hardness of Rockwell B70 to B85 and having the thickness of Type C in Table 48 and hole sizes as specified in Table 51. The screws shall produce mating threads in the test plates without breaking or shearing of the screw threads. 5.7 Drive Screw Designation EXAMPLES: (1) Round head metallic drive, ASME B18.6.3, 10 ⴛ 5⁄16, screw, steel. (2) Round head metallic drive screw, ASME B18.6.3, 5⁄16 ⴛ 0.50, steel, zinc plated per ASTM F 1941, Zn/Fe 3A. (a) Type U metallic drive screws shall be designated by the following data in the sequence shown: (b) Until ASME B18.24 is revised, the part identifying numbers will be listed under B18.6.4 rather than B18.6.3. --`,,```,,,,````-`-`,,`,,`,`,,`--- 10 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Not for Resale ASME B18.6.3-2010 Table 1 Dimensions of Slotted Flat Countersunk Head Screws Nominal Size or Basic Machine Screw Screw Length, Diameter L [Notes (1),(6),(7)] [Note (2)] 0000 0.0210 000 0.0340 00 0.0470 These Lengths or Shorter Are Undercut [Note (2)] Head Diameter, A Type A & AB Tapping Screws Other Types of Tapping Screws Max. ... ... ... ... ... ... ... ... ... Protrusion Above Gaging Diameter, F [Note (4)] Min. Head Height, H, Ref. [Note (3)] Max. Min. Max. Min. Max. Min. Gaging Diameter, G [Note (4)] 0.040 0.060 0.087 0.035 0.055 0.080 0.011 0.016 0.028 0.008 0.011 0.017 0.004 0.007 0.010 0.007 0.009 0.014 0.003 0.005 0.009 [Note (5)] [Note (5)] [Note (5)] [Note (5)] [Note (5)] [Note (5)] [Note (5)] [Note (5)] [Note (5)] Slot Width, J Slot Depth, T 0 1 2 3 4 0.0600 0.0730 0.0860 0.0990 0.1120 1 ⁄8 ⁄8 1 ⁄8 1 ⁄8 3 ⁄16 3 ⁄16 ⁄16 3 ⁄16 7 ⁄32 1 ⁄4 1 1 3 ⁄8 ⁄32 ⁄16 7 ⁄32 1 ⁄4 0.112 0.137 0.162 0.187 0.212 0.096 0.120 0.144 0.167 0.191 0.035 0.043 0.051 0.059 0.067 0.023 0.026 0.031 0.035 0.039 0.016 0.019 0.023 0.027 0.031 0.015 0.019 0.023 0.027 0.030 0.010 0.012 0.015 0.017 0.020 0.026 0.028 0.029 0.031 0.032 0.016 0.016 0.017 0.018 0.019 0.078 0.101 0.124 0.148 0.172 5 6 7 8 10 0.1250 0.1380 0.1510 0.1640 0.1900 3 ⁄16 ⁄16 ... 1 ⁄4 5 ⁄16 1 ⁄4 ⁄16 3 ⁄8 7 ⁄16 1 ⁄2 1 5 5 ⁄4 ⁄16 3 ⁄8 7 ⁄16 1 ⁄2 0.237 0.262 0.287 0.312 0.362 0.215 0.238 0.262 0.285 0.333 0.075 0.083 0.091 0.100 0.116 0.043 0.048 0.048 0.054 0.060 0.035 0.039 0.039 0.045 0.050 0.034 0.038 0.041 0.045 0.053 0.022 0.024 0.027 0.029 0.034 0.034 0.036 0.037 0.039 0.042 0.020 0.021 0.022 0.023 0.025 0.196 0.220 0.243 0.267 0.313 12 14 1 ⁄4 16 18 0.2160 0.2420 0.2500 0.2680 0.2940 3 ⁄8 ... 7 ⁄16 ... ... 9 ⁄16 ⁄8 5 ⁄8 3 ⁄4 13 ⁄16 9 ⁄16 ... 5 ⁄8 ... ... 0.412 0.462 0.477 0.512 0.561 0.380 0.427 0.442 0.475 0.522 0.132 0.148 0.153 0.164 0.180 0.067 0.075 0.075 0.075 0.084 0.056 0.064 0.064 0.064 0.072 0.060 0.068 0.070 0.075 0.083 0.039 0.044 0.046 0.049 0.054 0.045 0.049 0.050 0.052 0.055 0.027 0.029 0.029 0.031 0.033 0.362 0.410 0.424 0.457 0.505 ⁄16 20 24 3 ⁄8 7 ⁄16 0.3125 0.3200 0.3720 0.3750 0.4375 1 ⁄2 ... ... 9 ⁄16 5 ⁄8 13 5 ⁄8 ... ... 5 ⁄8 3 ⁄4 0.597 0.611 0.711 0.717 0.760 0.556 0.569 0.664 0.670 0.715 0.191 0.196 0.228 0.230 0.223 0.084 0.084 0.094 0.094 0.094 0.072 0.072 0.081 0.081 0.081 0.088 0.090 0.105 0.106 0.103 0.058 0.059 0.069 0.070 0.066 0.057 0.058 0.065 0.065 0.073 0.034 0.035 0.039 0.039 0.044 0.539 0.553 0.648 0.653 0.690 1 ⁄2 ⁄16 5 ⁄8 3 ⁄4 0.5000 0.5625 0.6250 0.7500 3 ⁄4 ... ... ... ... ... ... ... 3 0.815 0.932 1.050 1.285 0.765 0.878 0.990 1.215 0.223 0.260 0.298 0.372 0.106 0.118 0.133 0.149 0.091 0.102 0.116 0.131 0.103 0.120 0.137 0.171 0.065 0.077 0.088 0.111 0.081 0.089 0.097 0.112 0.049 0.053 0.058 0.067 0.739 0.851 0.962 1.186 5 9 3 --`,,```,,,,````-`-`,,`,,`,`,,`--- Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS 5 ⁄16 ⁄16 13 1 ... ... 5 3 ⁄4 ... ... ... 11 Not for Resale ASME B18.6.3-2010 Table 1 Dimensions of Slotted Flat Countersunk Head Screws (Cont’d) GENERAL NOTES: (a) For additional requirements for machine screws, refer to sections 2 and 3, and for tapping screws refer to sections 2 and 4. (b) Applicable to screw types as indicated below. See referenced tables for thread and point dimensions. (1) Type A thread forming, except short lengths, see Table 42. (2) Type AB thread forming, see Table 40. (3) Type B and BP thread forming, see Table 41 and Types BF and BT thread cutting, see Table 43. (4) Type C thread forming, see Mandatory Appendix VI; Types D, F, G, and T thread cutting, see Table 44; and Type TRS thread-rolling, see Table 45. (c) For recess dimensions, refer to Table 2. (d) For slot inspection, see para. 2.1.4. NOTES: (1) Where specifying nominal size in decimals, zeros preceding the decimal and in the fourth decimal place shall be omitted. (2) Screws of these lengths and shorter shall have undercut heads as shown in Table 9. For tapping screws, use Type AB undercut head screws in place of Type A screws for these lengths and shorter. (3) Tabulated values determined from formula for maximum H in Nonmandatory Appendix C. (4) No tolerance for gaging diameter is given. If the gaging diameter of the gage used differs from tabulated value, the protrusion will be affected accordingly and the proper protrusion values must be recalculated using the formulas shown in Mandatory Appendix I. (5) Not practical to gage. (6) Sizes 0000, 000, 00, 9⁄16, 5⁄8, and 3⁄4 are for machine screws only. (7) Sizes 7, 14, 16, 18, 20, and 24 are for tapping screws only. --`,,```,,,,````-`-`,,`,,`,`,,`--- 12 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Not for Resale Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS P 13 Not for Resale 0.122 0.148 0.168 0.176 0.182 0.198 0.262 0.276 0.112 0.125 0.138 0.151 4 5 6 7 8 0.164 10 0.190 12 0.216 14 0.242 0.062 0.070 0.096 0.100 0.060 0.073 0.086 0.099 0 1 2 3 Nominal Screw Size or Basic Screw Diameter Recess Dia., [Notes (1), (2), (3)] M, Ref. M Type I 2 2 3 3 1 2 2 2 0 0 1 1 Driver Size Type I 0.110 0.125 0.139 0.154 0.082 0.075 0.095 0.103 0.036 0.044 0.056 0.061 Max. 0.087 0.102 0.116 0.131 0.066 0.052 0.072 0.080 0.020 0.028 0.040 0.045 Min. Recess Penetration Gaging Depth, P 0.182 0.198 0.262 0.276 0.122 0.148 0.168 0.176 0.062 0.070 0.096 0.100 Recess Dia., M, Ref. M Type IA 2 2 3 3 1 2 2 2 0 0 1 1 Driver Size Type IA P 0.107 0.122 0.136 0.151 0.079 0.071 0.091 0.099 0.037 0.045 0.053 0.058 Max. 0.089 0.104 0.118 0.133 0.063 0.053 0.073 0.081 0.021 0.029 0.037 0.042 Min. Recess Penetration Gaging Depth, P 0.112 0.112 0.133 0.133 0.070 0.091 0.091 0.091 ... ... 0.050 0.070 Across Flats, M, Ref. 2S 2R 3R 3R 0 1S 1S 1R ... ... 00 0 Driver Size (4) Max. Min. Recess Penetration Gaging Depth, P [Note (5)] P 0.063 0.075 0.095 0.095 0.038 0.055 0.055 0.065 0.048 0.060 0.080 0.080 0.028 0.040 0.040 0.050 ... ... ... ... 0.033 0.028 0.038 0.028 M Type III Type III Recess Dimensions for Flat Countersunk Head Screws --`,,```,,,,````-`-`,,`,,`,`,,`--- Table 2 0.132 0.155 0.178 0.200 0.094 0.111 0.111 0.132 ... 0.058 0.069 0.094 T15 T20 T25 T27 T8 T10 T10 T15 ... T5 T6 T8 Recess Dia., Driver M, Ref. Size M 0.051 0.065 0.070 0.080 0.033 0.037 0.045 0.045 ... 0.017 0.022 0.025 Max. 0.040 0.050 0.055 0.065 0.028 0.035 0.035 0.035 ... 0.012 0.017 0.020 Min. Recess Penetration Gaging Depth, P Type VI Type VI 0.026 0.031 0.036 0.040 0.019 0.022 0.022 0.022 ... 0.010 0.014 0.019 Max. Fallaway P ASME B18.6.3-2010 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS 0.372 0.386 0.386 0.402 0.418 0.443 0.565 0.628 20 0.320 24 0.372 3 ⁄8 0.375 7 ⁄16 0.438 1 ⁄2 0.500 ⁄16 0.563 5 ⁄8 0.625 3 ⁄4 0.750 Not for Resale 4 4 5 5 4 4 4 4 3 3 4 4 Driver Size 0.256 0.280 0.309 0.373 0.21 0.225 0.225 0.241 0.154 0.174 0.196 0.196 Max. 0.234 0.258 0.283 0.347 0.188 0.203 0.203 0.219 0.131 0.151 0.174 0.174 Min. Recess Penetration Gaging Depth, P 0.418 0.440 0.566 0.630 0.372 0.386 0.386 0.402 0.276 0.296 0.358 0.358 Recess Dia., M, Ref. 4 4 5 5 4 4 4 4 3 3 4 4 Driver Size Type IA 0.253 0.276 0.307 0.372 0.206 0.222 0.222 0.238 0.151 0.171 0.193 0.193 Max. 0.235 0.258 0.286 0.351 0.188 0.204 0.204 0.220 0.133 0.153 0.175 0.175 Min. Recess Penetration Gaging Depth, P ... ... ... ... 0.191 0.191 0.191 ... 0.133 0.133 0.191 0.191 Across Flats, M, Ref. ... ... ... ... 4R 4R 4R ... 3R 3R 4R 4R Driver Size (4) Type III 0.080 0.080 0.085 0.085 Min. ... ... ... ... 14 --`,,```,,,,````-`-`,,`,,`,`,,`--- 0.352 0.446 0.446 0.529 0.266 0.266 0.266 0.352 0.200 0.221 0.221 0.266 T50 T55 T55 T60 T40 T40 T40 T50 T27 T30 T30 T40 Recess Dia., Driver M, Ref. Size 0.135 0.160 0.160 0.230 0.115 0.125 0.135 0.125 0.090 0.070 0.090 0.105 Max. 0.120 0.140 0.140 0.205 0.095 0.105 0.115 0.105 0.075 0.055 0.075 0.087 Min. Recess Penetration Gaging Depth, P Type VI 0.062 0.078 0.078 0.093 0.047 0.047 0.047 0.062 0.040 0.042 0.042 0.047 Max. Fallaway NOTES: (1) Where specifying nominal size in decimals, zeros preceding the decimal and in the fourth decimal place shall be omitted. (2) Sizes 9⁄16, 5⁄8, and 3⁄4 are for machine screws only. (3) Sizes 7, 14, 16, 18, 20, and 24 are for tapping screws only. (4) “R” in the recess size tabulation means regular depth recess, and the “S” means short depth recess. (5) Square recesses incorporate a slight taper on the sides of the recess. This taper can result in loss of penetration gaging depth on finished fasteners due to the build up of plating in the recesses. The recess penetration dimensions specified here are for finished (plated) product. Manufacturers should be advised that they should not use all this tolerance in the heading process, or an out of tolerance condition could exist after plating. ... ... ... ... 0.100 0.085 0.100 0.085 0.100 0.085 ... ... 0.095 0.095 0.100 0.100 Max. Recess Penetration Gaging Depth, P [Note (5)] Recess Dimensions for Flat Countersunk Head Screws (Cont’d) GENERAL NOTES: (a) For additional requirements for machine screws, refer to sections 2 and 3, and for tapping screws refer to sections 2 and 4. (b) For head dimensions, refer to Table 1. (c) For recess inspection, see para. 2.1.3. 9 0.276 0.296 0.358 0.358 1 ⁄4 0.250 16 0.268 18 0.294 5 ⁄16 0.313 Nominal Screw Size or Basic Screw Diameter Recess Dia., [Notes (1), (2), (3)] M, Ref. Type I Table 2 ASME B18.6.3-2010 ASME B18.6.3-2010 Table 3 Dimensions of Slotted 100-deg Flat Countersunk Head Screws (Machine Screws Only) Head Height, H [Note (2)] Nominal Size or Basic Screw Diameter [Note (1)] Max. Min. Ref. Max. Min. Max. Min. Max. Min. Gaging Diameter, G [Note (3)] 0000 0.0210 000 0.0340 00 0.0470 0.040 0.060 0.087 0.035 0.055 0.080 0.009 0.014 0.020 0.008 0.012 0.017 0.005 0.008 0.010 0.008 0.011 0.013 0.004 0.007 0.008 [Note (4)] [Note (4)] [Note (4)] [Note (4)] [Note (4)] [Note (4)] [Note (4)] [Note (4)] [Note (4)] Head Diameter, A Slot Width, J Slot Depth, T Protrusion Above Gaging Diameter, F [Note (3)] --`,,```,,,,````-`-`,,`,,`,`,,`--- 0 1 2 3 0.0600 0.0730 0.0860 0.0990 0.112 0.137 0.162 0.187 0.095 0.118 0.142 0.165 0.026 0.031 0.037 0.043 0.023 0.026 0.031 0.035 0.016 0.019 0.023 0.027 0.013 0.016 0.019 0.022 0.008 0.010 0.012 0.014 0.020 0.021 0.022 0.024 0.012 0.013 0.014 0.015 0.074 0.098 0.121 0.144 4 6 8 10 0.1120 0.1380 0.1640 0.1900 0.212 0.262 0.312 0.362 0.188 0.235 0.282 0.329 0.049 0.060 0.072 0.083 0.039 0.048 0.054 0.060 0.031 0.039 0.045 0.050 0.024 0.030 0.036 0.042 0.017 0.022 0.027 0.031 0.025 0.028 0.031 0.034 0.016 0.017 0.019 0.021 0.167 0.214 0.261 0.307 1 ⁄4 0.2500 ⁄16 0.3125 3 ⁄8 0.3750 0.477 0.597 0.717 0.437 0.550 0.662 0.110 0.138 0.165 0.075 0.084 0.094 0.064 0.072 0.081 0.055 0.069 0.083 0.042 0.053 0.065 0.040 0.047 0.053 0.025 0.030 0.034 0.415 0.526 0.638 5 GENERAL NOTES: (a) For additional requirements, refer to sections 2 and 3. (b) For recess dimensions, refer to Table 4. (c) For slot inspection, see para. 2.1.4. NOTES: (1) Where specifying nominal size in decimals, zeros preceding the decimal and in the fourth decimal place shall be omitted. (2) Tabulated values determined from formula for maximum H in Nonmandatory Appendix C. (3) No tolerance for gaging diameter is given. If the gaging diameter of the gage used differs from tabulated value, the protrusion will be affected accordingly and the proper protrusion values must be recalculated using the formulas shown in Mandatory Appendix I. (4) Not practical to gage. 15 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Not for Resale Table 4 Recess Dimensions for 100-deg Flat Countersunk Head Screws (Machine Screws Only) P Type I 0.062 min. P Type IA M M Optional Shoulder for Long Recessed Head Screws With Reduced Body Type I Nominal Size or Basic Screw Diameter [Note (1)] 0 1 2 3 4 6 8 10 1 ⁄4 5 ⁄16 3 ⁄8 0.0600 0.0730 0.0860 0.0990 0.1120 0.1380 0.1640 0.1900 0.2500 0.3125 0.3750 Recess Dia., M, Ref. Driver Size 0.054 0.062 0.088 0.096 0.110 0.148 0.162 0.178 0.240 0.310 0.336 0 0 1 1 1 2 2 2 3 4 4 Type IA Recess Penetration Gaging Depth, P Max. Min. Recess Dia., M, Ref. 0.028 0.036 0.049 0.056 0.071 0.075 0.090 0.105 0.118 0.148 0.173 0.012 0.020 0.033 0.040 0.055 0.052 0.067 0.082 0.095 0.126 0.151 0.054 0.062 0.088 0.096 0.110 0.148 0.162 0.178 0.240 0.310 0.336 Driver Size 0 0 1 1 1 2 2 2 3 4 4 Recess Penetration Gaging Depth, P Max. Min. 0.029 0.037 0.046 0.053 0.068 0.071 0.086 0.101 0.114 0.145 0.170 0.013 0.021 0.030 0.037 0.052 0.053 0.068 0.083 0.096 0.127 0.152 NOTE: (1) Where specifying nominal size in decimals, zeros preceding the decimal and in the fourth decimal place shall be omitted. 16 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Not for Resale --`,,```,,,,````-`-`,,`,,`,`,,`--- ASME B18.6.3-2010 ASME B18.6.3-2010 Nominal Size or Basic Screw Diameter [Note (1)] Head Diameter, A Head Height, H [Note (2)] Slot Width, J Slot Depth, T Protrusion Above Gaging Diameter, F [Note (3)] Max. Min. Ref. Max. Min. Max. Min. Max. Min. Gaging Diameter, G [Note (3)] 4 6 8 10 0.1120 0.1380 0.1640 0.1900 0.212 0.262 0.312 0.362 0.188 0.235 0.282 0.329 0.049 0.060 0.072 0.083 0.039 0.048 0.054 0.060 0.031 0.039 0.045 0.050 0.024 0.030 0.036 0.042 0.017 0.022 0.027 0.031 0.025 0.028 0.031 0.034 0.019 0.021 0.023 0.026 0.167 0.214 0.261 0.307 1 0.2500 0.3125 0.3750 0.4375 0.477 0.597 0.717 0.837 0.437 0.550 0.662 0.774 0.110 0.138 0.165 0.193 0.075 0.084 0.094 0.094 0.064 0.072 0.081 0.081 0.055 0.069 0.083 0.097 0.042 0.053 0.065 0.076 0.040 0.047 0.053 0.060 0.031 0.037 0.042 0.047 0.415 0.526 0.638 0.750 1 ⁄2 0.5000 ⁄16 0.5625 5 ⁄8 0.6250 0.957 1.077 1.197 0.887 1.000 1.112 0.221 0.249 0.276 0.106 0.118 0.133 0.091 0.102 0.116 0.111 0.125 0.139 0.088 0.099 0.111 0.066 0.073 0.080 0.053 0.058 0.063 0.862 0.974 1.086 ⁄4 ⁄16 3 ⁄8 7 ⁄16 5 9 GENERAL NOTE: For additional requirements, refer to sections 2 and 3. NOTES: (1) Where specifying nominal size in decimals, zeros preceding the decimal and in the fourth decimal place shall be omitted. (2) Tabulated values determined from formula for maximum H in Nonmandatory Appendix C. (3) No tolerance for gaging diameter is given. If the gaging diameter of the gage used differs from tabulated value, the protrusion will be affected accordingly and the proper protrusion values must be recalculated using the formulas shown in Mandatory Appendix I. 17 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Not for Resale --`,,```,,,,````-`-`,,`,,`,`,,`--- Table 5 Dimensions of Slotted Close Tolerance 100-deg Flat Countersunk Head Screws (Machine Screws Only) ASME B18.6.3-2010 Table 6 Recess Dimensions for Close Tolerance 100-deg Flat Countersunk Head Screws (Machine Screws Only) Type I Type IA P M 0.062 min. P M Optional Shoulder for Long Recessed Head Screws With Reduced Body Type I Nominal Size or Basic Screw Diameter [Note (1)] 4 6 8 10 1 ⁄4 5 ⁄16 3 ⁄8 7 ⁄16 1 ⁄2 9 ⁄16 5 ⁄8 0.1120 0.1380 0.1640 0.1900 0.2500 0.3125 0.3750 0.4375 0.5000 0.5625 0.6250 Recess Dia., M, Ref. Driver Size 0.110 0.148 0.162 0.178 0.240 0.310 0.336 0.360 0.386 0.418 0.504 1 2 2 2 3 4 4 4 4 4 5 Type IA Recess Penetration Gaging Depth, P Max. Min. Recess Dia., M, Ref. Driver Size 0.071 0.075 0.090 0.105 0.118 0.148 0.173 0.198 0.226 0.256 0.248 0.055 0.052 0.067 0.082 0.095 0.126 0.151 0.176 0.204 0.234 0.222 0.110 0.148 0.162 0.178 0.240 0.310 0.336 0.360 0.386 0.418 0.488 1 2 2 2 3 4 4 4 4 4 5 Recess Penetration Gaging Depth, P Max. Min. 0.068 0.071 0.086 0.101 0.114 0.145 0.170 0.194 0.222 0.253 0.228 0.052 0.053 0.068 0.083 0.096 0.127 0.152 0.176 0.204 0.235 0.207 NOTE: (1) Where specifying nominal size in decimals, zeros preceding the decimal and in the fourth decimal place shall be omitted. --`,,```,,,,````-`-`,,`,,`,`,,`--- Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS 18 Not for Resale Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS 19 Not for Resale 0.0470 0.0600 0.0730 0.0860 0.0990 10 12 14 1 ⁄4 16 0.1900 0.2160 0.2420 0.2500 0.2680 4 0.1120 5 0.1250 6 0.1380 7 0.1510 8 0.1640 00 0 1 2 3 Nominal Size or Basic Screw Diameter [Notes (1), (7), (8)] 1 ⁄16 ⁄8 ... 7 ⁄16 ... 3 9 ⁄2 ⁄16 5 ⁄8 5 ⁄8 3 ⁄4 1 5 3 ⁄4 ⁄4 5 ⁄16 3 ⁄8 7 ⁄16 1 3 ⁄16 ⁄16 3 ⁄16 ... 1 ⁄4 ... 3 ⁄16 3 ⁄16 3 ⁄16 7 ⁄32 ... 1 ⁄8 1 ⁄8 1 ⁄8 1 ⁄8 Length, L [Note (2)] Type A & AB Tapping Screws ⁄4 ⁄4 5 ⁄16 3 ⁄8 7 ⁄16 ⁄2 ⁄16 ... 5 ⁄8 ... 9 1 1 1 ... 1 ⁄8 5 ⁄32 3 ⁄16 7 ⁄32 Other Types of Tapping Screws These Lengths or Shorter Are Undercut [Note (2)] C J T 0.362 0.412 0.462 0.477 0.512 0.212 0.237 0.262 0.287 0.312 0.087 0.112 0.137 0.162 0.187 Max. 0.333 0.380 0.427 0.442 0.475 0.191 0.215 0.238 0.262 0.285 0.080 0.096 0.120 0.144 0.167 Min. Head Diameter, A H O 0.116 0.132 0.148 0.153 0.164 0.067 0.075 0.083 0.091 0.100 0.028 0.035 0.043 0.051 0.059 Head Side Height, H, Ref. [Note (3)] 0.060 0.068 0.076 0.079 0.084 0.037 0.041 0.045 0.049 0.052 0.014 0.021 0.025 0.029 0.033 Head Crown Height, C, Ref. Lo (see para. 3.2) L 0.176 0.200 0.224 0.232 0.248 0.104 0.116 0.128 0.140 0.152 0.042 0.056 0.068 0.080 0.092 Total Head Height, O, Ref. [Note (4)] 0.060 0.067 0.075 0.075 0.075 0.039 0.043 0.048 0.048 0.054 0.017 0.023 0.026 0.031 0.035 Min. 0.050 0.056 0.064 0.064 0.064 0.031 0.035 0.039 0.039 0.045 0.010 0.016 0.019 0.023 0.027 Slot Width, J Max. Edge of head may be flat or rounded 0.103 0.117 0.132 0.136 0.146 0.059 0.067 0.074 0.081 0.088 0.023 0.030 0.038 0.045 0.052 0.084 0.096 0.108 0.112 0.120 0.049 0.055 0.060 0.066 0.072 0.016 0.025 0.031 0.037 0.043 Min. Slot Depth, T Protrusion gage G A Max. Dimensions of Slotted Oval Countersunk Head Screws --`,,```,,,,````-`-`,,`,,`,`,,`--- Table 7 0.102 0.113 0.125 0.129 0.136 0.069 0.075 0.080 0.085 0.091 [Note (6)] 0.047 0.053 0.058 0.064 Max. 0.075 0.084 0.093 0.095 0.102 0.048 0.053 0.057 0.062 0.066 [Note (6)] 0.031 0.035 0.039 0.044 Min. Protrusion Above Gaging Diameter, F [Note (5)] F 0.313 0.362 0.410 0.424 0.457 0.172 0.196 0.220 0.243 0.267 [Note (6)] 0.078 0.101 0.124 0.148 Gaging Diameter, G [Note (5)] ASME B18.6.3-2010 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS 0.2940 0.3125 0.3200 0.3720 0.3750 0.4375 0.5000 0.5625 0.6250 0.7500 7 ⁄8 ⁄4 ... ... ... 3 5 ... 1 ⁄2 ... ... 9 ⁄16 Length, L [Note (2)] ... ... ... ... ... 13 ⁄16 ⁄16 13 ⁄16 1 ... 13 Type A & AB Tapping Screws ⁄4 ⁄4 ... ... ... 3 3 ... 5 ⁄8 ... ... 5 ⁄8 Other Types of Tapping Screws 0.760 0.815 0.932 1.050 1.285 0.561 0.597 0.611 0.711 0.717 Max. 0.715 0.765 0.878 0.990 1.215 0.522 0.556 0.569 0.664 0.670 Min. Head Diameter, A 0.223 0.223 0.260 0.298 0.372 0.180 0.191 0.196 0.228 0.230 Head Side Height, H, Ref. [Note (3)] 0.122 0.131 0.150 0.169 0.206 0.092 0.099 0.100 0.116 0.117 Head Crown Height, C, Ref. 0.345 0.354 0.410 0.467 0.578 0.272 0.290 0.296 0.344 0.347 Total Head Height, O, Ref. [Note (4)] 0.094 0.106 0.118 0.133 0.149 0.084 0.084 0.084 0.094 0.094 Max. Min. 0.081 0.091 0.102 0.116 0.131 0.072 0.072 0.072 0.081 0.081 Slot Width, J 0.210 0.216 0.250 0.285 0.353 0.160 0.171 0.175 0.204 0.206 Max. 0.174 0.176 0.207 0.235 0.293 0.132 0.141 0.144 0.168 0.170 Min. Slot Depth, T Dimensions of Slotted Oval Countersunk Head Screws (Cont’d) 0.195 0.212 0.239 0.266 0.318 0.147 0.155 0.158 0.181 0.182 Max. 0.150 0.163 0.184 0.206 0.240 0.111 0.117 0.120 0.138 0.139 Min. Protrusion Above Gaging Diameter, F [Note (5)] 0.690 0.739 0.851 0.962 1.186 0.505 0.539 0.553 0.648 0.653 Gaging Diameter, G [Note (5)] 20 Not for Resale --`,,```,,,,````-`-`,,`,,`,`,,`--- GENERAL NOTES: (a) For additional requirements for machine screws, refer to sections 2 and 3, and for tapping screws refer to sections 2 and 4. (b) Applicable to screw types as indicated below. See referenced tables for thread and point dimensions. (1) Type A thread forming, except short lengths, see Table 42. (2) Type AB thread forming, see Table 40. (3) Type B and BP thread forming, see Table 41 and Types BF and BT thread cutting, see Table 43. (4) Type C thread forming, see Mandatory Appendix VI; Types D, F, G, and T thread cutting, see Table 44; and Type TRS thread-rolling, see Table 45. (c) For recess dimensions, refer to Table 8. (d) For slot inspection, see para. 2.1.4. NOTES: (1) Where specifying nominal size in decimals, zeros preceding the decimal and in the fourth decimal place shall be omitted (2) Screws of these lengths and shorter shall have undercut heads as shown in Table 11. For tapping screws, use Type AB undercut head screws in place of Type A screws for these lengths and shorter. (3) Tabulated values determined from formula for maximum H in Nonmandatory Appendix C. (4) Tabulated values determined from formula for maximum O in Nonmandatory Appendix C. (5) No tolerance for gaging diameter is given. If the gaging diameter of the gage used differs from tabulated value, the protrusion will be affected accordingly and the proper protrusion values must be recalculated using the formulas shown in Mandatory Appendix I. (6) Not practical to gage. (7) Sizes 00, 9⁄16, 5⁄8, and 3⁄4 are for machine screws only. (8) Sizes 7, 14, 16, 18, 20, and 24 are for tapping screws only. ⁄16 1 ⁄2 9 ⁄16 5 ⁄8 3 ⁄4 5 18 ⁄16 20 24 3 ⁄8 Nominal Size or Basic Screw Diameter [Notes (1), (7), (8)] These Lengths or Shorter Are Undercut [Note (2)] Table 7 ASME B18.6.3-2010 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS 0.130 0.152 0.172 0.176 0.186 0.202 0.264 0.282 0.284 0.326 0.374 0.384 0.394 0.430 0.404 0.416 0.0600 0.0730 0.0860 0.0990 0.1120 0.1250 0.1380 0.1510 4 5 6 7 8 0.1640 10 0.1900 12 0.2160 14 0.2420 1 ⁄4 0.2500 16 0.2680 18 0.2940 5 ⁄16 0.3125 20 0.3200 24 0.3720 3 ⁄8 0.3750 7 ⁄16 0.4375 0.068 0.070 0.106 0.118 Recess Dia., M, Ref. 0 1 2 3 Nominal Size or Basic Screw Diameter [Notes (1), (2), (3)] M 21 Not for Resale 4 4 4 4 3 3 4 4 2 2 3 3 1 2 2 2 0 0 1 1 Driver Size Type I P 0.225 0.262 0.237 0.249 0.156 0.197 0.206 0.218 0.108 0.126 0.135 0.156 0.087 0.074 0.094 0.100 0.038 0.041 0.062 0.074 Max. 0.201 0.238 0.213 0.225 0.131 0.172 0.182 0.194 0.084 0.102 0.111 0.131 0.070 0.050 0.069 0.075 0.020 0.023 0.045 0.057 Min. Recess Penetration Gaging Depth, P --`,,```,,,,````-`-`,,`,,`,`,,`--- Type I 0.394 0.430 0.404 0.416 0.284 0.326 0.374 0.384 0.186 0.202 0.264 0.282 0.130 0.152 0.172 0.176 0.068 0.070 0.106 0.118 4 4 4 4 3 3 4 4 2 2 3 3 1 2 2 2 0 0 1 1 Driver Size Type IA M Type IA 0.225 0.261 0.235 0.247 0.155 0.197 0.205 0.215 0.108 0.125 0.135 0.153 0.086 0.074 0.093 0.099 0.042 0.043 0.062 0.074 Max. 0.207 0.243 0.217 0.229 0.137 0.179 0.187 0.197 0.090 0.107 0.117 0.135 0.070 0.056 0.075 0.081 0.024 0.027 0.046 0.058 Min. Recess Penetration Gaging Depth, P P 0.191 0.191 0.191 ... 0.133 0.133 0.191 0.191 0.112 0.112 0.133 0.133 0.070 0.091 0.091 0.091 ... ... 0.050 0.070 Recess, AF, Ref. 4R 4R 4R ... 3R 3R 4R 4R 2R 2R 3R 3R 0 1R 1R 1R ... ... 00 0 Driver Size (4) Type III M P 0.100 0.100 0.100 ... 0.095 0.095 0.100 0.100 0.075 0.075 0.095 0.095 0.038 0.065 0.065 0.065 ... ... 0.033 0.038 Max. 0.085 0.085 0.085 ... 0.080 0.080 0.085 0.085 0.060 0.060 0.080 0.080 0.028 0.050 0.050 0.050 ... ... 0.028 0.028 Min. Recess Penetration Gaging Depth, P [Note (5)] Type III Recess Dimensions for Oval Countersunk Head Screws Recess Dia., M, Ref. Table 8 0.266 0.312 0.312 0.352 0.221 0.221 0.266 0.266 0.155 0.178 0.200 0.221 0.094 0.111 0.132 0.132 ... ... 0.069 0.094 Recess Dia., M, Ref. T40 T45 T45 T50 T30 T30 T40 T40 T20 T25 T27 T30 T8 T10 T15 T15 ... ... T6 T8 Driver Size Type VI M 0.130 0.155 0.155 0.150 0.105 0.115 0.115 0.125 0.071 0.090 0.090 0.095 0.033 0.055 0.055 0.060 ... ... 0.022 0.025 Max. 0.110 0.130 0.130 0.130 0.085 0.095 0.095 0.105 0.055 0.070 0.070 0.075 0.028 0.045 0.045 0.050 ... ... 0.017 0.022 Min. Recess Penetration Gaging Depth, P Type VI P 0.050 0.055 0.055 0.062 0.044 0.045 0.045 0.047 0.031 0.036 0.040 0.042 0.019 0.022 0.026 0.028 ... ... 0.014 0.019 Fallaway ASME B18.6.3-2010 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS 0.430 0.462 0.580 0.642 1 ⁄2 0.5000 ⁄16 0.5625 5 ⁄8 0.6250 3 ⁄4 0.7500 4 4 5 5 Driver Size Type I 0.263 0.296 0.323 0.388 Max. 0.239 0.272 0.291 0.357 Min. Recess Penetration Gaging Depth, P 0.430 0.450 0.562 0.624 Recess Dia., M, Ref. 4 4 5 5 Driver Size Type IA 0.262 0.285 0.300 0.362 Max. 0.244 0.267 0.279 0.341 Min. Recess Penetration Gaging Depth, P ... ... ... ... Recess, AF, Ref. ... ... ... ... Driver Size (4) Type III ... ... ... ... Max. ... ... ... ... Min. Recess Penetration Gaging Depth, P [Note (5)] 0.352 0.446 0.446 0.529 Recess Dia., M, Ref. Recess Dimensions for Oval Countersunk Head Screws (Cont’d) T50 T55 T55 T60 Driver Size Type VI 0.169 0.190 0.190 0.230 Max. 0.150 0.165 0.165 0.210 Min. Recess Penetration Gaging Depth, P 0.062 0.078 0.078 0.093 Fallaway 22 Not for Resale --`,,```,,,,````-`-`,,`,,`,`,,`--- GENERAL NOTES: (a) For additional requirements for machine screws, refer to sections 2 and 3, and for tapping screws refer to sections 2 and 4. (b) For head dimensions, refer to Table 7. (c) For recess inspection, see para. 2.1.3. NOTES: (1) Where specifying nominal size in decimals, zeros preceding the decimal and in the fourth decimal place shall be omitted. (2) Sizes 9⁄16, 5⁄8, and 3⁄4 are for machine screws only. (3) Sizes 7, 14, 16, 18, 20, and 24 are for tapping screws only. (4) “R” in the recess size tabulation means regular depth recess, and the “S” means short depth recess. (5) Square recesses incorporate a slight taper on the sides of the recess. This taper can result in loss of penetration gaging depth on finished fasteners due to the build up of plating in the recesses. The recess penetration dimensions specified here are for finished (plated) product. Manufacturers should be advised that they should not use all this tolerance in the heading process, or an out of tolerance condition could exist after plating. 9 Recess Dia., M, Ref. Nominal Size or Basic Screw Diameter [Notes (1), (2), (3)] Table 8 ASME B18.6.3-2010 ASME B18.6.3-2010 --`,,```,,,,````-`-`,,`,,`,`,,`--- Table 9 Dimensions of Slotted Undercut 82-deg Flat Countersunk Head Screws These Lengths or Shorter Are Undercut, L [Note (2)] Nominal Size or Basic Machine Other Head Screw Screw Type Types Diameter, Diameter Length, A & AB of A [Notes (1) L Tapping Tapping and (5)] [Note (2)] Screws Screws Max. Min. 0 1 2 3 4 0.0600 0.0730 0.0860 0.0990 0.1120 1 1 3 5 6 7 8 10 0.1250 0.1380 0.1510 0.1640 0.1900 3 ⁄16 ⁄16 ... 1 ⁄4 5 ⁄16 5 ⁄4 ⁄16 3 ⁄8 7 ⁄16 1 ⁄2 5 12 14 1 ⁄4 16 18 0.2160 0.2420 0.2500 0.2680 0.2940 3 ⁄8 ... 7 ⁄16 ... ... 0.3125 0.3200 0.3720 0.3750 1 ⁄16 0.4375 1 ⁄2 0.5000 5 ⁄16 20 24 3 ⁄8 7 ⁄8 ⁄8 1 ⁄8 1 ⁄8 3 ⁄16 3 1 Slot Width, J Slot Depth, T Max. Min. Max. Min. Max. Min. Protrusion Above Gaging Diameter, F [Note (3)] Max. Min. Gaging Diameter, G [Note (3)] ⁄8 ⁄32 3 ⁄16 7 ⁄32 1 ⁄4 0.112 0.137 0.162 0.187 0.212 0.096 0.120 0.144 0.167 0.191 0.025 0.031 0.036 0.042 0.047 0.018 0.023 0.028 0.033 0.038 0.023 0.026 0.031 0.035 0.039 0.016 0.019 0.023 0.027 0.031 0.011 0.014 0.016 0.019 0.022 0.007 [Note (4)] [Note (4)] [Note (4)] 0.009 [Note (4)] [Note (4)] [Note (4)] 0.011 0.029 0.017 0.124 0.012 0.031 0.018 0.148 0.014 0.032 0.019 0.172 1 ⁄4 ⁄16 3 ⁄8 7 ⁄16 1 ⁄2 0.237 0.262 0.287 0.312 0.362 0.215 0.238 0.262 0.285 0.333 0.053 0.059 0.064 0.070 0.081 0.043 0.048 0.053 0.058 0.068 0.043 0.048 0.048 0.054 0.060 0.035 0.039 0.039 0.045 0.050 0.024 0.027 0.030 0.032 0.037 0.016 0.017 0.019 0.021 0.024 0.034 0.036 0.037 0.039 0.042 0.020 0.021 0.022 0.023 0.025 0.196 0.220 0.243 0.267 0.313 9 ⁄16 5 ⁄8 5 ⁄8 11 ⁄16 3 ⁄4 9 ⁄16 ... 5 ⁄8 ... ... 0.412 0.462 0.477 0.512 0.581 0.380 0.427 0.442 0.475 0.522 0.092 0.103 0.107 0.114 0.126 0.078 0.089 0.092 0.099 0.109 0.067 0.075 0.075 0.075 0.084 0.056 0.064 0.064 0.064 0.072 0.043 0.047 0.050 0.053 0.058 0.028 0.032 0.032 0.035 0.039 0.045 0.049 0.050 0.052 0.055 0.027 0.029 0.029 0.031 0.033 0.362 0.410 0.424 0.457 0.505 ⁄2 ... ... 9 ⁄16 13 ⁄16 ⁄16 7 ⁄8 ... 5 ⁄8 ... ... 5 ⁄8 0.597 0.611 0.711 0.717 0.556 0.569 0.664 0.670 0.134 0.137 0.159 0.161 0.116 0.119 0.139 0.140 0.084 0.084 0.094 0.094 0.072 0.072 0.081 0.081 0.062 0.063 0.074 0.075 0.041 0.042 0.049 0.049 0.057 0.058 0.065 0.065 0.034 0.035 0.039 0.039 0.539 0.553 0.648 0.653 5 ... ... 3 0.760 0.715 0.156 0.133 0.094 0.081 0.072 0.045 0.815 0.765 0.156 0.130 0.106 0.091 0.072 0.046 0.073 0.081 0.044 0.049 0.690 0.739 3 ⁄8 ⁄4 3 ⁄16 ⁄16 3 ⁄16 7 ⁄32 1 ⁄4 Head Height, H 1 13 5 ⁄4 ⁄4 3 GENERAL NOTES: (a) For additional requirements for machine screws, refer to sections 2 and 3, and for tapping screws refer to sections 2 and 4. (b) Applicable to screw types as indicated below. See referenced tables for thread and point dimensions and minimum practical screw lengths. (1) Type AB thread forming, see Table 40. (2) Type B and BP thread forming, see Table 41; and Types BF and BT thread cutting, see Table 43. (3) Type C thread forming, see Mandatory Appendix VI; Types D, F, G, and T thread cutting, see Table 44; and Type TRS thread-rolling, see Table 45. (c) For recess dimensions, refer to Table 10. (d) For slot inspection, see para. 2.1.4. NOTES: (1) Where specifying nominal size in decimals, zeros preceding the decimal and in the fourth decimal place shall be omitted. (2) Screws of these lengths and shorter are undercut. Screws of longer lengths shall have head heights as shown in Table 1. (3) No tolerance for gaging diameter is given. If the gaging diameter of the gage used differs from tabulated value, the protrusion will be affected accordingly and the proper protrusion values must be recalculated using the formulas shown in Mandatory Appendix I. (4) Not practical to gage. (5) Size 7 is for tapping screws only. 23 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Not for Resale ASME B18.6.3-2010 Table 10 Recess Dimensions for Undercut 82-deg Flat Countersunk Head Screws Type I Type IA P Type III P M M M P A Type I Nominal Size or Basic Screw Diameter [Notes (1), (2)] Recess Dia., M, Ref. Driver Size Type IA Recess Penetration Gaging Depth, P Max. Min. Recess Dia., M, Ref. Driver Size Type III Recess Penetration Gaging Depth, P Max. Min. Recess Across Flats, M, Ref. Driver Size (3) Recess Penetration Gaging Depth, P [Note (4)] Max. Min. 0 1 2 3 4 0.0600 0.0730 0.0860 0.0990 0.1120 0.062 0.070 0.088 0.096 0.110 0 0 1 1 1 0.036 0.044 0.049 0.056 0.071 0.020 0.028 0.033 0.040 0.055 0.062 0.070 0.088 0.096 0.110 0 0 1 1 1 0.037 0.045 0.046 0.053 0.068 0.021 0.029 0.030 0.037 0.052 ... ... ... 0.050 0.050 ... ... ... 00 00 ... ... ... 0.033 0.033 ... ... ... 0.028 0.028 5 6 7 8 10 0.1250 0.1380 0.1510 0.1640 0.1900 0.122 0.140 0.148 0.168 0.182 1 2 2 2 2 0.082 0.067 0.075 0.095 0.110 0.066 0.044 0.052 0.072 0.087 0.122 0.140 0.148 0.168 0.182 1 2 2 2 2 0.079 0.063 0.071 0.091 0.107 0.063 0.045 0.053 0.073 0.089 0.070 0.091 0.091 0.112 0.112 0 1SS 1SS 2SS 2SS 0.038 0.027 0.027 0.037 0.037 0.028 0.017 0.017 0.027 0.027 12 14 1 ⁄4 16 18 0.2160 0.2420 0.2500 0.2680 0.2940 0.226 0.224 0.224 0.262 0.310 3 3 3 3 4 0.104 0.119 0.119 0.139 0.139 0.081 0.096 0.096 0.116 0.126 0.226 0.242 0.242 0.262 0.310 3 3 3 3 4 0.100 0.115 0.115 0.136 0.145 0.082 0.097 0.097 0.118 0.127 0.133 0.133 0.133 0.133 0.191 3SS 3S 3S 3R 4R 0.073 0.080 0.080 0.095 0.100 0.063 0.065 0.065 0.080 0.085 0.3125 0.3200 0.3720 0.3750 0.4375 0.5000 0.310 0.329 0.358 0.358 0.386 0.402 4 4 4 4 4 4 0.148 0.166 0.196 0.196 0.225 0.241 0.126 0.144 0.174 0.174 0.203 0.219 0.310 0.328 0.358 0.358 0.386 0.402 4 4 4 4 4 4 0.145 0.163 0.193 0.193 0.222 0.238 0.127 0.145 0.175 0.175 0.204 0.220 0.191 0.191 0.191 0.191 ... ... 4R 4R 4R 4R ... ... 0.100 0.100 0.100 0.100 ... ... 0.085 0.085 0.085 0.085 ... ... 5 ⁄16 20 24 3 ⁄8 7 ⁄16 1 ⁄2 GENERAL NOTES: (a) For additional requirements for machine screws, refer to sctions 2 and 3, and for tapping screws refer to sctions 2 and 4 (b) For head dimensions, refer to Table 9 (c) For recess inspection, see para. 2.1.3 NOTES: (1) Where specifying nominal size in decimals, zeros preceding the decimal and in the fourth decimal place shall be omitted. (2) Size 7 is for tapping screws only. (3) “R” in the recess size tabulation means regular depth recess, and the “S” means short depth recess. (4) Square recesses incorporate a slight taper on the sides of the recess. This taper can result in loss of penetration gaging depth on finished fasteners due to the build up of plating in the recesses. The recess penetration dimensions specified here are for finished (plated) product. Manufacturers should be advised that they should not use all this tolerance in the heading process, or an out-oftolerance condition could exist after plating. 24 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS --`,,```,,,,````-`-`,,`,,`,`,,`--- Not for Resale Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS 25 Not for Resale 0.1250 0.1380 0.1510 0.1640 0.1900 0.2160 0.2420 0.2500 0.2680 0.2940 0.3125 0.3200 0.3720 0.3750 0.4375 0.5000 5 6 7 8 10 12 14 1 ⁄4 16 18 5 ⁄16 20 24 3 ⁄8 7 ⁄16 1 ⁄2 0.0600 0.0730 0.0860 0.0990 0.1120 0 1 2 3 4 Nominal Size or Basic Screw Diameter [Notes (1), (5)] 1 9 3 ⁄8 ... 7 ⁄16 ... ... 1 ⁄2 ... ... 9 ⁄16 5 ⁄8 3 ⁄4 ⁄16 ⁄16 1 ... ... 13 13 ⁄16 5 ⁄8 5 ⁄8 3 ⁄4 13 ⁄16 5 ⁄4 ⁄16 3 ⁄8 7 ⁄16 1 ⁄2 3 ⁄16 ⁄16 ... 1 ⁄4 5 ⁄16 3 3 1 ⁄16 ⁄16 3 ⁄16 7 ⁄32 1 ⁄4 3 Type A & AB Tapping Screws ⁄8 ⁄8 1 ⁄8 1 ⁄8 3 ⁄16 1 Machine Screw Length, L [Note (2)] ⁄8 ⁄32 3 ⁄16 7 ⁄32 1 ⁄4 ⁄4 ⁄16 3 ⁄8 7 ⁄16 1 ⁄2 5 ⁄8 ... ... 5 ⁄8 3 ⁄4 3 ⁄4 9 ⁄16 ... 5 ⁄8 ... ... 5 1 5 1 0.597 0.611 0.711 0.717 0.760 0.815 0.412 0.462 0.477 0.512 0.561 0.237 0.262 0.287 0.312 0.362 0.112 0.137 0.162 0.187 0.212 Max. H 0.556 0.569 0.664 0.670 0.715 0.765 0.380 0.427 0.442 0.475 0.522 0.215 0.238 0.262 0.285 0.333 0.096 0.120 0.144 0.167 0.191 0.134 0.137 0.160 0.161 0.156 0.156 0.092 0.104 0.107 0.115 0.126 0.053 0.059 0.064 0.070 0.081 0.025 0.031 0.036 0.042 0.047 Head Side Height, H, Ref. [Note (3)] L Lo (see para. 2.2) Min. Head Diameter, A C J O T 0.099 0.100 0.116 0.117 0.122 0.131 0.068 0.076 0.079 0.084 0.092 0.041 0.045 0.049 0.052 0.060 0.021 0.025 0.029 0.033 0.037 Head Crown Height, C, Ref. F 0.232 0.237 0.275 0.278 0.279 0.288 0.161 0.180 0.186 0.199 0.218 0.094 0.104 0.113 0.123 0.142 0.046 0.056 0.065 0.075 0.084 Max. 0.198 0.204 0.238 0.239 0.239 0.244 0.135 0.153 0.158 0.170 0.187 0.076 0.084 0.093 0.101 0.118 0.033 0.042 0.050 0.059 0.067 Min. Total Head Height, O G A 0.084 0.084 0.094 0.094 0.094 0.106 0.067 0.075 0.075 0.075 0.084 0.043 0.048 0.048 0.054 0.060 0.023 0.026 0.031 0.035 0.039 Max. 0.072 0.072 0.081 0.081 0.081 0.091 0.056 0.064 0.064 0.064 0.072 0.035 0.039 0.039 0.045 0.050 0.016 0.019 0.023 0.027 0.031 Min. Slot Width, J 0.149 0.152 0.177 0.179 0.184 0.204 0.103 0.115 0.119 0.127 0.140 0.059 0.065 0.071 0.078 0.090 0.028 0.034 0.040 0.047 0.053 Max. 0.124 0.127 0.148 0.149 0.154 0.169 0.085 0.096 0.098 0.106 0.116 0.048 0.053 0.059 0.064 0.074 0.022 0.027 0.033 0.038 0.043 Min. Slot Depth, T Protrusion gage Edge of head may be flat or rounded Dimensions of Slotted Undercut Oval Countersunk Head Screws --`,,```,,,,````-`-`,,`,,`,`,,`--- Other Types of Tapping Screws These Lengths or Shorter Are Undercut, L [Note (2)] Table 11 0.155 0.158 0.181 0.182 0.195 0.212 0.113 0.125 0.129 0.136 0.147 0.075 0.080 0.085 0.091 0.102 0.047 0.053 0.058 0.064 0.069 Max. 0.117 0.120 0.138 0.139 0.150 0.163 0.084 0.093 0.095 0.102 0.111 0.053 0.057 0.062 0.066 0.075 0.031 0.035 0.039 0.044 0.048 Min. Protrusion Above Gaging Diameter, F [Note (4)] 0.539 0.553 0.648 0.653 0.690 0.739 0.362 0.410 0.424 0.457 0.505 0.196 0.220 0.243 0.267 0.313 0.078 0.101 0.124 0.148 0.172 Gaging Diameter, G [Note (4)] ASME B18.6.3-2010 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Dimensions of Slotted Undercut Oval Countersunk Head Screws (Cont’d) 26 Not for Resale --`,,```,,,,````-`-`,,`,,`,`,,`--- GENERAL NOTES: (a) For additional requirements for machine screws, refer to sections 2 and 3, and for tapping screws refer to sections 2 and 4. (b) Applicable to screw types as indicated below. See referenced tables for thread and point dimensions and minimum practical screw lengths. (1) Type AB thread forming, see Table 40. (2) Type B and BP thread forming, see Table 41, and Types BF and BT thread cutting, see Table 43. (3) Type C thread forming, see Mandatory Appendix VI; Types D, F, G, and T thread cutting, see Table 44; and Type TRS thread-rollling, see Table 45. (c) For recess dimensions, refer to Table 12. (d) For slot inspection, see para. 2.1.4. NOTES: (1) Where specifying nominal size in decimals, zeros preceding the decimal and in the fourth decimal place shall be omitted. (2) Screws of these lengths and shorter are undercut. Screws of longer lengths shall have head heights as shown in Table 7. (3) Tabulated values determined from formula for maximum H in Nonmandatory Appendix C. (4) No tolerance for gaging diameter is given. If the gaging diameter of the gage used differs from tabulated value, the protrusion will be affected accordingly and the proper protrusion values must be recalculated using the formulas shown in Mandatory Appendix I. (5) Size 7 is for tapping screws only. Table 11 ASME B18.6.3-2010 ASME B18.6.3-2010 Table 12 Recess Dimensions for Undercut Oval 82-deg Countersunk Head Screws Type I Type IA P Type III P M M M P A Type I Nominal Size or Basic Screw Diameter [Notes (1), (2)] Recess Dia., M, Ref. Driver Size Type IA Recess Penetration Gaging Depth, P Max. Min. Recess Dia., M, Ref. Driver Size Type III Recess Penetration Gaging Depth, P Max. Min. Recess Across Flats, M, Ref. Driver Size (3) Recess Penetration Gaging Depth, P [Note (4)] Max. Min. 0 1 2 3 4 0.0600 0.0730 0.0860 0.0990 0.1120 0.068 0.070 0.106 0.118 0.130 0 0 1 1 1 0.038 0.041 0.062 0.074 0.087 0.020 0.023 0.045 0.057 0.070 0.068 0.070 0.106 0.118 0.130 0 0 1 1 1 0.040 0.043 0.062 0.074 0.086 0.024 0.027 0.046 0.058 0.070 ... ... 0.050 0.070 0.070 ... ... 00 0 0 ... ... 0.033 0.038 0.038 ... ... 0.028 0.028 0.028 5 6 7 8 10 0.1250 0.1380 0.1510 0.1640 0.1900 0.152 0.172 0.176 0.186 0.202 2 2 2 2 2 0.074 0.094 0.100 0.108 0.126 0.050 0.069 0.075 0.084 0.102 0.152 0.172 0.176 0.186 0.202 2 2 2 2 2 0.074 0.093 0.099 0.108 0.125 0.056 0.075 0.081 0.090 0.107 0.091 0.091 0.091 0.112 0.112 1R 1R 1R 2R 2R 0.065 0.065 0.065 0.075 0.075 0.050 0.050 0.05 0.060 0.060 12 14 1 ⁄4 16 18 0.2160 0.2420 0.2500 0.2680 0.2940 0.264 0.282 0.284 0.300 0.358 3 3 3 3 4 0.135 0.156 0.156 0.173 0.189 0.111 0.131 0.131 0.149 0.165 0.264 0.282 0.284 0.300 0.358 3 3 3 3 4 0.135 0.153 0.155 0.172 0.188 0.117 0.135 0.137 0.154 0.170 0.133 0.133 0.133 0.133 0.191 3R 3R 3R 3R 4R 0.095 0.095 0.095 0.095 0.100 0.080 0.080 0.080 0.080 0.085 0.3125 0.3200 0.3720 0.3750 0.4375 0.5000 0.374 0.384 0.394 0.394 0.404 0.416 4 4 4 4 4 4 0.206 0.218 0.225 0.225 0.237 0.249 0.182 0.194 0.201 0.201 0.213 0.225 0.374 0.384 0.394 0.394 0.404 0.416 4 4 4 4 4 4 0.205 0.215 0.225 0.225 0.235 0.247 0.187 0.197 0.207 0.207 0.217 0.229 0.191 0.191 0.191 0.191 ... ... 4R 4R 4R 4R ... ... 0.100 0.100 0.100 0.100 ... ... 0.085 0.085 0.085 0.085 ... ... 5 ⁄16 20 24 3 ⁄8 7 ⁄16 1 ⁄2 GENERAL NOTES: (a) For additional requirements for machine screws, refer to sections 2 and 3, and for tapping screws refer to sections 2 and 4. (b) For head dimensions, refer to Table 11. (c) For recess inspection, see para. 2.1.3. NOTES: (1) Where specifying nominal size in decimals, zeros preceding the decimal and in the fourth decimal place shall be omitted. (2) Size 7 is for tapping screws only. (3) “R” in the recess size tabulation means regular depth recess. (4) Square recesses incorporate a slight taper on the sides of the recess. This taper can result in loss of penetration gaging depth on finished fasteners due to the build up of plating in the recesses. The recess penetration dimensions specified here are for finished (plated) product. Manufacturers should be advised that they should not use all this tolerance in the heading process, or an out-oftolerance condition could exist after plating. 27 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Not for Resale --`,,```,,,,````-`-`,,`,,`,`,,`--- ASME B18.6.3-2010 Table 13 Dimensions of Flat Countersunk Trim Head Screws Edge of head may be flat or rounded T A A min. E F G H 0.062 min. [See Notes (2) & (3)] --`,,```,,,,````-`-`,,`,,`,`,,`--- Nominal Size or Basic Screw Diameter [Notes (1)–(4)] Head Size Protrusion gage H L Shoulder Diameter, E Shoulder Diameter, E, Type A, Tapping Screws [Note (5)] Shoulder Diameter, E; Other Types of Tapping Screws [Note (5)] Head Diameter, A Max. Min. Max. Min. Max. Min. Head Height, H, Ref. [Note (6)] Protrusion Above Gaging Diameter, F [Note (7)] Max. Min. Gaging Diameter, G [Note (7)] 4 5 6 6 0.1120 0.1250 0.1380 0.1380 3 4 4 5 0.112 0.125 0.138 0.138 0.106 0.119 0.131 0.131 0.105 0.118 0.131 0.131 0.106 0.119 0.131 0.131 0.187 0.212 0.212 0.237 0.167 0.191 0.191 0.215 0.052 0.060 0.052 0.068 0.031 0.032 0.032 0.034 0.018 0.019 0.019 0.020 0.148 0.172 0.172 0.196 8 8 10 12 0.1640 0.1640 0.1900 0.2160 5 6 8 8 0.164 0.164 0.190 0.216 0.157 0.157 0.181 0.207 0.157 0.157 0.183 0.209 0.157 0.157 0.181 0.207 0.237 0.262 0.312 0.312 0.215 0.238 0.285 0.285 0.052 0.069 0.085 0.069 0.034 0.036 0.039 0.039 0.020 0.021 0.023 0.023 0.196 0.220 0.267 0.267 12 14 14 1 ⁄4 0.2160 0.2420 0.2420 0.2500 10 10 12 10 0.216 ... ... 0.250 0.207 ... ... 0.240 0.209 0.235 0.235 ... 0.207 ... ... 0.240 0.362 0.362 0.412 0.362 0.333 0.333 0.380 0.333 0.101 0.080 0.112 0.080 0.042 0.042 0.045 0.042 0.025 0.025 0.027 0.025 0.313 0.313 0.362 0.313 1 0.2500 0.3125 0.3125 0.3750 12 12 1 ⁄4 5 ⁄16 0.250 0.312 0.312 0.375 0.240 0.302 0.302 0.364 ... ... ... ... 0.240 0.302 0.302 0.364 0.412 0.412 0.477 0.597 0.380 0.380 0.442 0.556 0.112 0.075 0.116 0.155 0.045 0.045 0.050 0.057 0.027 0.027 0.029 0.034 0.362 0.362 0.424 0.539 ⁄4 ⁄16 5 ⁄16 3 ⁄8 5 GENERAL NOTES: (a) For additional requirements for machine screws, refer to sections 2 and 3, and for tapping screws refer to sections 2 and 4. (b) Applicable to screw types as indicated below. See referenced tables for thread and point dimensions. (1) Type A thread forming, except short lengths, see Table 42. (2) Type AB thread forming, see Table 40. (3) Type B and BP thread forming, see Table 41; and Types BF and BT thread cutting, see Table 43. (4) Type C thread forming, see Mandatory Appendix VI; Types D, F, G, and T thread cutting, see Table 44; and Type TRS thread-rolling, see Table 45. (c) For recess dimensions, refer to Table 14. (d) For slot inspection, see para. 2.1.4. NOTES: (1) Where specifying nominal size in the decimals, zeros preceding the decimal and in the fourth decimal place shall be omitted. (2) Short machine screws include nominal lengths up to and including 11⁄8 in. for sizes No. 5 and smaller, and 2 in. for sizes No. 6 and larger. (3) Short tapping screws are those threaded full length. Refer to subsection 4.3 for applicable screw lengths. (4) Size 14 is for tapping screws only. (5) Maximum diameter shall not exceed minimum plus 0.011 in. for Type A tapping screws, and basic screw diameter for all other tapping screw types. (6) Tabulated values determined from formula for maximum H in Nonmandatory Appendix C. (7) No tolerance for gaging diameter is given. If the gaging diameter of the gage used differs from tabulated value, the protrusion will be affected accordingly and the proper protrusion values must be recalculated using the formulas shown in Mandatory Appendix I. 28 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Not for Resale ASME B18.6.3-2010 Table 14 Recess Dimensions for Flat Countersunk Trim Head Screws Type I P Type IA M M Type I Nominal Size or Basic Screw Diameter [Notes (1)–(4)] Head Size P Recess Dia., M, Ref. Driver Size Type IA Recess Penetration Gaging Depth, P Max. Min. Recess Dia., M, Ref. Driver Size Recess Penetration Gaging Depth, P Max. Min. 4 5 6 6 0.1120 0.1250 0.1380 0.1380 3 4 4 5 0.100 0.122 0.122 0.148 1 1 1 2 0.061 0.082 0.082 0.075 0.045 0.066 0.066 0.052 0.100 0.122 0.122 0.148 1 1 1 2 0.058 0.079 0.079 0.071 0.042 0.063 0.063 0.053 8 8 10 12 0.1640 0.1640 0.1900 0.2160 5 6 8 8 0.158 0.176 0.182 0.192 2 2 2 2 0.085 0.103 0.110 0.120 0.062 0.080 0.087 0.097 0.158 0.176 0.182 0.192 2 2 2 2 0.081 0.099 0.107 0.117 0.063 0.081 0.089 0.099 12 14 14 1 ⁄4 0.2160 0.2420 0.2420 0.2500 10 10 12 10 0.198 0.198 0.262 0.198 2 2 3 2 0.125 0.125 0.139 0.125 0.102 0.102 0.116 0.102 0.198 0.198 0.262 0.198 2 2 3 2 0.122 0.122 0.136 0.122 0.104 0.104 0.118 0.104 1 ⁄4 ⁄16 5 ⁄16 3 ⁄8 0.2500 0.3125 0.3125 0.3750 12 12 1 ⁄4 5 ⁄16 0.262 0.262 0.276 0.358 3 3 3 4 0.139 0.139 0.154 0.196 0.116 0.116 0.131 0.174 0.262 0.262 0.276 0.358 3 3 3 4 0.136 0.136 0.151 0.193 0.118 0.118 0.133 0.175 5 --`,,```,,,,````-`-`,,`,,`,`,,`--- GENERAL NOTES: (a) For additional requirements for machine screws, refer to sections 2 and 3, and for tapping screws refer to sections 2 and 4. (b) For head dimensions, refer to Table 13. (c) For recess inspection, see para. 2.1.3 NOTES: (1) Where specifying nominal size in decimals, zeros preceding the decimal and in the fourth decimal place shall be omitted (2) Short machine screws include nominal lengths up to and including 11⁄8 in. for sizes No. 5 and smaller, and 2 in. for sizes No. 6 and larger. (3) Short tapping screws are those threaded full length. Refer to subsection 4.3 for applicable screw lengths. (4) Size 14 is for tapping screws only. 29 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Not for Resale Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS 30 --`,,```,,,,````-`-`,,`,,`,`,,`--- Not for Resale Head Size Max. 3 4 4 5 5 6 8 8 10 0.112 0.125 0.138 0.138 8 0.164 8 0.164 10 0.190 12 0.216 12 0.216 4 5 6 6 ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... Min. Machine Screw Shoulder Diameter, E For Short Screws [Notes (2), (3)] Nominal Size or Basic Screw Diameter [Notes (1), (4)] C H O ... ... ... ... ... ... ... ... ... Min. ... ... ... ... ... ... ... ... ... Min. Shoulder Diameter, E, Other Types of Tapping Screws [Note (5)] Lo (See para. 3.2) L [See Notes (2) & (3)] H 0.237 0.262 0.312 0.312 0.362 0.187 0.212 0.212 0.237 Max. 0.215 0.238 0.285 0.285 0.333 0.167 0.191 0.191 0.215 Min. Head Diameter, A H 0.060 0.076 0.094 0.078 0.111 0.057 0.066 0.058 0.075 Head Side Height, H, Ref. [Note (6)] 0.041 0.045 0.076 0.076 0.060 0.033 0.037 0.037 0.041 Head Crown Height, C, Ref. 0.062 min. E G [See Note (6)] A 0.096 0.117 0.141 0.125 0.166 0.086 0.099 0.091 0.112 Total Head Height, O, Ref. [Note (7)] Protrusion gage F 0.019 0.021 0.025 0.025 0.029 0.014 0.017 0.017 0.019 Head Radius, R, Ref. Edge of head may be flat or rounded Dimensions of Oval 82-deg Countersunk Trim Head Screws R Shoulder Diameter, E, Type A Tapping Screws [Note (5)] T Table 15 0.075 0.080 0.091 0.091 0.102 0.064 0.069 0.069 0.075 Max. 0.053 0.057 0.066 0.066 0.075 0.044 0.048 0.048 0.053 Min. Protrusion Above Gaging Diameter, F [Note (8)] 0.196 0.220 0.267 0.267 0.313 0.148 0.172 0.172 0.196 Gaging Diameter, G [Note (8)] ASME B18.6.3-2010 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Head Size Max. Min. Machine Screw Shoulder Diameter, E 0.242 0.242 0.250 0.250 0.3125 0.3125 0.375 10 12 10 12 12 5 ⁄16 3 ⁄8 ... ... ... ... ... ... ... --`,,```,,,,````-`-`,,`,,`,`,,`--- 31 Not for Resale 0.190 0.216 0.216 0.242 0.242 10 12 12 14 14 1 ⁄4 0.250 ⁄4 0.250 5 ⁄16 0.3125 5 ⁄16 0.3125 3 ⁄8 0.375 1 0.112 0.125 0.138 0.138 0.164 0.164 4 5 6 6 8 8 10 12 12 5 ⁄16 3 ⁄8 8 8 10 10 12 3 4 4 5 5 6 0.250 0.250 0.312 0.312 0.375 0.190 0.216 0.216 ... ... 0.112 0.125 0.138 0.138 0.164 0.164 For Long Screws With Shoulder 14 14 1 ⁄4 1 ⁄4 5 ⁄16 5 ⁄16 3 ⁄8 0.240 0.240 0.302 0.302 0.364 0.181 0.207 0.207 ... ... 0.106 0.119 0.131 0.131 0.157 0.157 ... ... ... ... ... ... ... For Short Screws [Notes (2), (3)] (Cont’d) Nominal Size or Basic Screw Diameter [Notes (1), (4)] ... ... ... ... ... 0.183 0.209 0.209 0.235 0.235 0.105 0.118 0.131 0.131 0.157 0.157 ... ... ... ... ... ... ... Min. 0.240 0.240 0.302 0.302 0.364 0.181 0.207 0.207 ... ... 0.106 0.119 0.131 0.131 0.157 0.157 ... ... ... ... ... ... ... Min. Shoulder Diameter, E, Other Types of Tapping Screws [Note (5)] 0.362 0.412 0.412 0.477 0.597 0.312 0.312 0.362 0.362 0.412 0.187 0.212 0.212 0.237 0.237 0.262 0.362 0.412 0.362 0.412 0.412 0.477 0.597 Max. 0.333 0.380 0.380 0.442 0.556 0.285 0.285 0.333 0.333 0.380 0.167 0.191 0.191 0.215 0.215 0.238 0.333 0.380 0.333 0.380 0.380 0.442 0.556 Min. Head Diameter, A 0.091 0.124 0.087 0.130 0.173 0.094 0.078 0.111 0.091 0.124 0.057 0.066 0.058 0.075 0.060 0.076 0.091 0.124 0.091 0.124 0.087 0.130 0.173 Head Side Height, H, Ref. [Note (6)] 0.060 0.068 0.068 0.079 0.099 0.076 0.076 0.060 0.060 0.068 0.033 0.037 0.037 0.041 0.041 0.045 0.060 0.068 0.060 0.068 0.068 0.079 0.099 Head Crown Height, C, Ref. 0.146 0.187 0.150 0.202 0.265 0.141 0.125 0.166 0.146 0.187 0.086 0.099 0.091 0.112 0.096 0.117 0.146 0.187 0.146 0.187 0.150 0.202 0.265 Total Head Height, O, Ref. [Note (7)] 0.029 0.033 0.033 0.038 0.048 0.025 0.025 0.029 0.029 0.033 0.014 0.017 0.017 0.019 0.019 0.021 0.029 0.033 0.029 0.033 0.033 0.038 0.048 Head Radius, R, Ref. Dimensions of Oval 82-deg Countersunk Trim Head Screws (Cont’d) Shoulder Diameter, E, Type A Tapping Screws [Note (5)] Table 15 0.102 0.113 0.113 0.129 0.155 0.091 0.091 0.102 0.102 0.113 0.064 0.069 0.069 0.075 0.075 0.080 0.102 0.113 0.102 0.113 0.113 0.129 0.155 Max. 0.075 0.084 0.084 0.095 0.117 0.066 0.066 0.075 0.075 0.084 0.044 0.048 0.048 0.053 0.053 0.057 0.075 0.084 0.075 0.084 0.084 0.095 0.117 Min. Protrusion Above Gaging Diameter, F [Note (8)] 0.313 0.362 0.362 0.424 0.539 0.267 0.267 0.313 0.313 0.362 0.148 0.172 0.172 0.196 0.196 0.220 0.313 0.362 0.313 0.362 0.362 0.424 0.539 Gaging Diameter, G [Note (8)] ASME B18.6.3-2010 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Dimensions of Oval 82-deg Countersunk Trim Head Screws (Cont’d) 32 Not for Resale --`,,```,,,,````-`-`,,`,,`,`,,`--- GENERAL NOTES: (a) For additional requirements for machine screws, refer to sections 2 and 3, and for tapping screws refer to sections 2 and 4. (b) Applicable to screw types as indicated below. See referenced tables for thread and point dimensions and minimum practical screw lengths. (1) Type A thread forming, except short lengths, see Table 42. (2) Type AB thread forming, see Table 40. (3) Type B and BP thread forming, see Table 41; and Types BF and BT thread cutting, see Table 43. (4) Type C thread forming, see Mandatory Appendix VI; Types D, F, G, and T thread cutting, see Table 44; and Type TRS thread-rolling, see Table 45. (c) For recess dimensions, refer to Table 16. (d) For slot inspection, see para. 2.1.4. NOTES: (1) Where specifying nominal size in decimals, zeros preceding the decimal and in the fourth decimal place shall be omitted. (2) Short machine screws include nominal lengths up to and including 11⁄8 in. for sizes No. 5 and smaller, and 2 in. for sizes No. 6 and larger. (3) Short tapping screws are those threaded full length. Refer to subsection 4.3 for applicable screw lengths. (4) Size 14 is for tapping screws only. (5) Maximum diameter shall not exceed minimum plus 0.011 in. for Type A tapping screws, and basic screw diameter for all other tapping screw types. (6) Tabulating values determined from formula for maximum H in Nonmandatory Appendix C. (7) Tabulating values determined from formula for maximum O in Nonmandatory Appendix C. (8) No tolerance for gaging diameter is given. If the gaging diameter of the gage used differs from tabulated value, the protrusion will be affected accordingly and the proper protrusion values must be recalculated using the formulas shown in Mandatory Appendix I. Table 15 ASME B18.6.3-2010 ASME B18.6.3-2010 Table 16 Recess Dimensions for Oval 82-deg Countersunk Trim Head Screws Type I Type IA P M M Type I Nominal Size or Basic Screw Diameter [Notes (1)–(4)] P Head Size Recess Dia., M, Ref. Driver Size 4 5 6 6 8 8 10 12 12 14 14 1 ⁄4 1 ⁄4 5 ⁄16 5 ⁄16 3 ⁄8 0.118 0.130 0.130 0.152 0.152 0.172 0.186 0.186 0.202 0.202 0.264 0.202 0.264 0.264 0.284 0.384 0.118 0.130 0.130 0.162 0.162 0.188 0.200 0.200 0.214 0.214 0.264 0.214 0.264 0.264 0.264 0.384 Type IA Recess Penetration Gaging Depth, P Max. Min. Recess Dia., M, Ref. Driver Size 1 1 1 2 2 2 2 2 2 2 3 2 3 3 3 4 0.074 0.087 0.087 0.074 0.074 0.094 0.108 0.108 0.126 0.126 0.126 0.126 0.135 0.135 0.156 0.218 0.057 0.070 0.070 0.050 0.050 0.069 0.084 0.084 0.102 0.102 0.102 0.102 0.111 0.111 0.131 0.194 0.118 0.130 0.130 0.152 0.152 0.172 0.186 0.186 0.202 0.202 0.264 0.202 0.264 0.264 0.284 0.384 1 1 1 2 2 2 2 2 2 2 3 2 3 3 3 4 0.074 0.087 0.087 0.085 0.085 0.110 0.124 0.124 0.137 0.137 0.135 0.137 0.135 0.135 0.156 0.218 0.057 0.070 0.070 0.061 0.061 0.085 0.099 0.099 0.112 0.112 0.111 0.112 0.111 0.111 0.131 0.194 0.118 0.130 0.130 0.162 0.162 0.188 0.200 0.200 0.214 0.214 0.264 0.214 0.264 0.264 0.284 0.384 Recess Penetration Gaging Depth, P Max. Min. 1 1 1 2 2 2 2 2 2 2 3 2 3 3 3 4 0.074 0.086 0.086 0.074 0.074 0.093 0.108 0.108 0.125 0.125 0.135 0.125 0.135 0.135 0.155 0.215 0.058 0.070 0.070 0.056 0.056 0.075 0.090 0.090 0.107 0.107 0.117 0.107 0.117 0.117 0.137 0.197 1 1 1 2 2 2 2 2 2 2 3 2 3 3 3 4 0.074 0.086 0.086 0.084 0.084 0.109 0.122 0.122 0.136 0.136 0.135 0.136 0.135 0.135 0.155 0.215 0.058 0.070 0.070 0.066 0.066 0.091 0.104 0.104 0.118 0.118 0.117 0.118 0.117 0.117 0.137 0.197 4 5 6 6 8 8 10 12 12 14 14 1 ⁄4 1 ⁄4 5 ⁄16 5 ⁄16 3 ⁄8 0.1120 0.1250 0.1380 0.1380 0.1640 0.1640 0.1900 0.2160 0.2160 0.2420 0.2420 0.2500 0.2500 0.3125 0.3125 0.3750 For Long Screws With Shoulder 4 5 6 6 8 8 10 12 12 14 14 1 ⁄4 1 ⁄4 5 ⁄16 5 ⁄16 3 ⁄8 0.1120 0.1250 0.1380 0.1380 0.1640 0.1640 0.1900 0.2160 0.2160 0.2420 0.2420 0.2500 0.2500 0.3125 0.3125 0.3750 4 5 6 6 8 8 10 12 12 10 12 1 ⁄4 1 ⁄4 5 ⁄16 5 ⁄16 3 ⁄8 GENERAL NOTES: (a) For additional requirements for machine screws, refer to sections 2 and 3, and for tapping screws refer to sections 2 and 4. (b) For head dimensions, refer to Table 15. (c) For recess inspection, see para. 2.1.3. NOTES: (1) Where specifying nominal size in decimals, zeros preceding the decimal and in the fourth decimal place shall be omitted. (2) Short machine screws include nominal lengths up to and including 11⁄8 in. for sizes No. 5 and smaller, and 2 in. for sizes No. 6 and larger. (3) Short tapping screws are those threaded full length. Refer to subsection 4.3 for applicable screw lengths. (4) Size 14 is for tapping screws only. 33 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Not for Resale --`,,```,,,,````-`-`,,`,,`,`,,`--- For Short Screws ASME B18.6.3-2010 Table 17 Head Dimensions for Slotted Pan Head Screws Nominal Size or Basic Screw Diameter [Notes (1), (2), and (3)] Max. Min. Max. Min. Head Radius, R, Max. Head Diameter, A Head Height, H Slot Width, J Slot Depth, T Max. Min. Max. Min. 0000 000 00 0 0.0210 0.0340 0.0470 0.0600 0.042 0.066 0.090 0.116 0.036 0.060 0.082 0.104 0.016 0.023 0.032 0.039 0.010 0.017 0.025 0.031 0.007 0.010 0.015 0.020 0.008 0.012 0.017 0.023 0.004 0.008 0.010 0.016 0.008 0.012 0.016 0.022 0.004 0.008 0.010 0.014 1 2 3 4 0.0730 0.0860 0.0990 0.1120 0.142 0.167 0.193 0.219 0.130 0.155 0.180 0.205 0.046 0.053 0.060 0.068 0.038 0.045 0.051 0.058 0.025 0.035 0.037 0.042 0.026 0.031 0.035 0.039 0.019 0.023 0.027 0.031 0.027 0.031 0.036 0.040 0.018 0.022 0.026 0.030 5 6 7 8 0.1250 0.1380 0.1510 0.1640 0.245 0.270 0.296 0.322 0.231 0.256 0.281 0.306 0.075 0.082 0.089 0.096 0.065 0.072 0.079 0.085 0.044 0.046 0.049 0.052 0.043 0.048 0.048 0.054 0.035 0.039 0.039 0.045 0.045 0.050 0.054 0.058 0.034 0.037 0.041 0.045 10 12 14 1 ⁄4 0.1900 0.2160 0.2420 0.2500 0.373 0.425 0.476 0.492 0.357 0.407 0.457 0.473 0.110 0.125 0.139 0.144 0.099 0.112 0.126 0.130 0.061 0.078 0.087 0.087 0.060 0.067 0.075 0.075 0.050 0.056 0.064 0.064 0.068 0.077 0.085 0.087 0.053 0.061 0.068 0.070 16 18 5 ⁄16 20 0.2680 0.2940 0.3125 0.3200 0.528 0.579 0.615 0.631 0.508 0.558 0.594 0.608 0.153 0.168 0.178 0.182 0.139 0.153 0.162 0.166 0.094 0.099 0.099 0.121 0.075 0.084 0.084 0.084 0.064 0.072 0.072 0.072 0.093 0.100 0.106 0.108 0.074 0.080 0.085 0.087 24 3 ⁄8 7 ⁄16 1 ⁄2 0.3720 0.3750 0.4375 0.5000 0.734 0.740 0.863 0.987 0.709 0.716 0.837 0.958 0.211 0.212 0.247 0.281 0.193 0.195 0.228 0.260 0.143 0.143 0.153 0.175 0.094 0.094 0.094 0.106 0.081 0.081 0.081 0.091 0.123 0.124 0.142 0.161 0.100 0.100 0.116 0.131 ⁄16 0.5625 5 ⁄8 0.6250 3 ⁄4 0.7500 1.041 1.172 1.435 1.000 1.125 1.375 0.315 0.350 0.419 0.293 0.325 0.390 0.197 0.219 0.263 0.118 0.133 0.149 0.102 0.116 0.131 0.179 0.197 0.234 0.146 0.162 0.192 9 --`,,```,,,,````-`-`,,`,,`,`,,`--- GENERAL NOTES: (a) For additional requirements for machine screws, refer to sections 2 and 3, and for tapping screws refer to sections 2 and 4. (b) Applicable to screw types as indicated below. See referenced tables for thread and point dimensions and minimum practical screw lengths. (1) Type A thread forming, except short lengths, see Table 42. (2) Type AB thread forming, see Table 40. (3) Type B and BP thread forming, see Table 41, and Types BF and BT thread cutting, see Table 43. (4) Type C thread forming, see Mandatory Appendix VI; Types D, F, G, and T thread cutting, see Table 44; and Type TRS thread-rolling, see Table 45. (c) For recess dimensions, refer to Table 19. (d) For slot inspection, see para. 2.1.4. NOTES: (1) Where specifying nominal size in decimals, zeros preceding the decimal and in the fourth decimal place shall be omitted. (2) Sizes 0000, 000, 00, 9⁄16, 5⁄8, and 3⁄4 are for machine screws only. (3) Sizes 7, 14, 16, 18, 20, and 24 are for tapping screws only. 34 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Not for Resale ASME B18.6.3-2010 Table 18 Dimensions of Type I Cross Recessed Pan Head Screws Type I P M R A H Nominal Size or Basic Screw Diameter [Notes (1), (2), and (3)] Head Diameter, A L Head Height, H Max. Min. Max. Min. Head Radius, R, Min. Recess Diameter, M, Ref. Driver Size Recess Penetration Gaging Depth, P Max. Min. 0 1 2 3 0.0600 0.0730 0.0860 0.0990 0.116 0.142 0.167 0.193 0.104 0.130 0.155 0.180 0.044 0.053 0.062 0.071 0.036 0.044 0.053 0.062 0.005 0.005 0.010 0.010 0.060 0.067 0.097 0.105 0 0 1 1 0.032 0.040 0.052 0.061 0.014 0.022 0.034 0.043 4 5 6 7 0.1120 0.1250 0.1380 0.1510 0.219 0.245 0.270 0.296 0.205 0.231 0.256 0.281 0.080 0.089 0.097 0.106 0.070 0.079 0.087 0.096 0.010 0.015 0.015 0.015 0.115 0.152 0.159 0.170 1 2 2 2 0.071 0.072 0.080 0.089 0.053 0.046 0.055 0.064 8 10 12 14 0.1640 0.1900 0.2160 0.2420 0.322 0.373 0.425 0.476 0.306 0.357 0.407 0.457 0.115 0.133 0.151 0.169 0.105 0.122 0.139 0.156 0.015 0.020 0.025 0.035 0.175 0.192 0.252 0.274 2 2 3 3 0.097 0.113 0.124 0.144 0.071 0.089 0.098 0.118 1 ⁄4 16 18 5 ⁄16 0.2500 0.2680 0.2940 0.3125 0.492 0.528 0.579 0.615 0.473 0.508 0.558 0.594 0.175 0.187 0.205 0.218 0.162 0.173 0.191 0.203 0.035 0.035 0.035 0.040 0.274 0.286 0.328 0.343 3 3 4 4 0.144 0.158 0.158 0.173 0.118 0.132 0.134 0.149 20 24 3 ⁄8 7 ⁄16 0.3200 0.3720 0.3750 0.4375 0.631 0.734 0.740 0.863 0.608 0.709 0.716 0.837 0.223 0.259 0.261 0.305 0.208 0.242 0.244 0.284 0.040 0.040 0.040 0.050 0.344 0.382 0.382 0.406 4 4 4 4 0.173 0.213 0.213 0.239 0.149 0.190 0.190 0.214 1 ⁄2 ⁄16 5 ⁄8 3 ⁄4 0.5000 0.5625 0.6250 0.7500 0.987 1.041 1.172 1.435 0.958 1.000 1.125 1.375 0.348 0.391 0.434 0.521 0.325 0.366 0.406 0.488 0.055 0.065 0.075 0.085 0.428 0.458 0.575 0.621 4 4 5 5 0.260 0.292 0.310 0.349 0.235 0.268 0.281 0.322 9 GENERAL NOTES: (a) For additional requirements for machine screws, refer to sections 2 and 3, and for tapping screws refer to sections 2 and 4. (b) For recess inspection, see para. 2.1.3. NOTES: (1) Where specifying nominal size in decimals, zeros preceding the decimal and in the fourth decimal place shall be omitted. (2) Sizes 9⁄16, 5⁄8, and 3⁄4 are for machine screws only. (3) Sizes 7, 14, 16, 18, 20, and 24 are for tapping screws only. --`,,```,,,,````-`-`,,`,,`,`,,`--- Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS 35 Not for Resale ASME B18.6.3-2010 Table 19 Recess Dimensions for Pan Head Screws (Types IA, III, and VI) P P P M M M Type IA Nominal Size or Basic Screw Diameter [Notes (1), (2), (3)] Recess Dia., M, Ref. Driver Size Type III Recess Penetration Gaging Depth, P Max. Min. Recess Across Flats, M, Ref. Driver Size (4) Type VI Recess Penetration Gaging Depth, P [Note (5)] Max. Min. Recess Dia., M, Ref. Driver Size Recess Penetration Gaging Depth, P [Note (5)] Max. Min. Fallaway 0 1 2 3 0.0600 0.0730 0.0860 0.0990 0.060 0.067 0.097 0.105 0 0 1 1 0.033 0.040 0.053 0.062 0.017 0.024 0.037 0.046 ... ... 0.050 0.070 ... ... 00 0 ... ... 0.033 0.038 ... ... 0.028 0.028 0.058 0.069 0.094 0.094 T5 T6 T8 T8 0.020 0.030 0.035 0.038 0.015 0.025 0.030 0.033 0.009 0.014 0.019 0.019 4 5 6 7 0.1120 0.1250 0.1380 0.1510 0.115 0.147 0.155 0.164 1 2 2 2 0.072 0.068 0.076 0.085 0.056 0.050 0.058 0.067 0.070 0.091 0.091 0.091 0 1R 1R 1R 0.038 0.065 0.065 0.065 0.028 0.050 0.050 0.050 0.111 0.111 0.132 0.132 T10 T10 T15 T15 0.045 0.055 0.055 0.060 0.035 0.045 0.045 0.050 0.022 0.022 0.026 0.026 8 10 12 14 0.1640 0.1900 0.2160 0.2420 0.170 0.185 0.247 0.266 2 2 3 3 0.092 0.108 0.117 0.137 0.074 0.090 0.099 0.119 0.112 0.112 0.133 0.133 2R 2R 3R 3R 0.075 0.075 0.095 0.095 0.060 0.060 0.080 0.080 0.155 0.178 0.200 0.221 T20 T25 T27 T30 0.070 0.085 0.085 0.075 0.055 0.070 0.070 0.060 0.031 0.036 0.040 0.044 1 ⁄4 16 18 5 ⁄16 0.2500 0.2680 0.2940 0.3125 0.266 0.278 0.322 0.334 3 3 4 4 0.137 0.149 0.152 0.164 0.119 0.131 0.134 0.146 0.133 0.133 0.191 0.191 3R 3R 4R 4R 0.095 0.095 0.100 0.100 0.080 0.080 0.085 0.085 0.221 0.221 0.266 0.266 T30 T30 T40 T40 0.100 0.110 0.095 0.120 0.085 0.095 0.080 0.105 0.044 0.044 0.047 0.047 20 24 3 ⁄8 7 ⁄16 0.3200 0.3720 0.3750 0.4375 0.344 0.370 0.370 0.392 4 4 4 4 0.164 0.201 0.201 0.224 0.146 0.183 0.183 0.206 0.191 0.191 0.191 ... 4R 4R 4R ... 0.100 0.100 0.100 ... 0.085 0.085 0.085 ... 0.266 0.312 0.312 0.352 T40 T45 T45 T50 0.130 0.145 0.145 0.159 0.115 0.130 0.130 0.144 0.047 0.055 0.055 0.062 1 ⁄2 ⁄16 5 ⁄8 3 ⁄4 0.5000 0.5625 0.6250 0.7500 0.413 0.444 0.558 0.602 4 4 5 5 0.246 0.277 0.295 0.341 0.228 0.259 0.274 0.320 ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... 0.446 ... ... ... T55 ... ... ... 0.180 ... ... ... 0.165 ... ... ... 0.078 ... ... ... 9 GENERAL NOTES: (a) For additional requirements for machine screws, refer to sections 2 and 3, and for tapping screws refer to sections 2 and 4. (b) For head dimensions, refer to Table 18. (c) For recess inspection, see para. 2.1.3. NOTES: (1) Where specifying nominal size in decimals, zeros preceding the decimal and in the fourth decimal place shall be omitted. (2) Sizes 9⁄16, 5⁄8, and 3⁄4 are for machine screws only. (3) Sizes 7, 14, 16, 18, 20, and 24 are for tapping screws only. (4) “R” in the recess size tabulation means regular depth recess. (5) Square recesses incorporate a slight taper on the sides of the recess. This taper can result in loss of penetration gaging depth on finished fasteners due to the buildup of plating in the recesses. The recess penetration dimensions specified here are for finished (plated) product. Manufacturers should be advised that they should not use all this tolerance in the heading process, or an out-of-tolerance condition could exist after plating. 36 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS --`,,```,,,,````-`-`,,`,,`,`,,`--- Not for Resale Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS 37 Not for Resale 0.023 0.026 0.031 0.035 0.039 0.043 0.048 0.048 0.054 0.060 5 0.1250 6 0.1380 7 0.1510 8 0.1640 10 0.1900 Max. 0.035 0.039 0.039 0.045 0.050 0.016 0.019 0.023 0.027 0.031 Min. Slot Width, J 0.0600 0.0730 0.0860 0.0990 0.1120 0 1 2 3 4 Nominal Size or Basic Screw Diameter [Notes (1), (2), and (3)] A R T H P 0.045 0.050 0.054 0.058 0.068 0.022 0.027 0.031 0.036 0.040 Max. 0.030 0.033 0.036 0.041 0.048 0.013 0.016 0.020 0.023 0.027 Min. Slot Depth, T [Note (4)] M Type I With Slot 0.152 0.159 0.170 0.175 0.192 0.060 0.067 0.097 0.105 0.115 Recess Dia., M, Ref. A 2 2 2 2 2 0 0 1 1 1 Driver Size H P 0.072 0.080 0.089 0.097 0.113 0.032 0.040 0.052 0.061 0.071 Max. 0.046 0.055 0.064 0.071 0.089 0.014 0.022 0.034 0.043 0.053 Min. Recess Penetration Gaging Depth, P Type I R T M Type III With Slot J L 0.147 0.155 0.164 0.170 0.185 0.060 0.067 0.097 0.105 0.115 Recess Dia., M, Ref. L A 2 2 2 2 2 0 0 1 1 1 T H P 0.068 0.076 0.085 0.092 0.108 0.033 0.040 0.053 0.062 0.072 Max. 0.050 0.058 0.067 0.074 0.090 0.017 0.024 0.037 0.046 0.056 Min. Recess Penetration Gaging Depth, P [Note (5)] Optional head design Type IA R Driver Size M Type IA With Slot Recess Dimensions for Combination Slotted-Pan Head Screws --`,,```,,,,````-`-`,,`,,`,`,,`--- Table 20 L 0.091 0.091 0.091 0.112 0.112 ... ... 0.050 0.070 0.070 Recess Across Flats, M, Ref. 1R 1R 1R 2R 2R ... ... 00 0 0 Driver Size [Note (6)] 0.065 0.065 0.065 0.075 0.075 ... ... 0.033 0.038 0.038 Max. 0.050 0.050 0.050 0.060 0.060 ... ... 0.028 0.028 0.028 Min. Recess Penetration Gaging Depth, P [Note (5)] Type III ASME B18.6.3-2010 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS 0.3125 0.3200 0.3720 0.3750 0.4375 0.5000 5 38 Not for Resale 0.072 0.072 0.081 0.081 0.081 0.091 0.056 0.064 0.064 0.064 0.072 Min. 0.106 0.108 0.123 0.124 0.142 0.161 0.077 0.085 0.087 0.093 0.100 Max. 0.076 0.080 0.090 0.090 0.105 0.118 0.055 0.060 0.063 0.068 0.072 Min. Slot Depth, T [Note (4)] 0.343 0.344 0.382 0.382 0.406 0.428 0.252 0.274 0.274 0.286 0.328 Recess Dia., M, Ref. 4 4 4 4 4 4 3 3 3 3 4 Driver Size 0.173 0.173 0.213 0.213 0.239 0.260 0.124 0.144 0.144 0.158 0.158 Max. 0.149 0.149 0.190 0.190 0.214 0.235 0.098 0.118 0.118 0.132 0.134 Min. Recess Penetration Gaging Depth, P Type I 0.334 0.344 0.370 0.370 0.392 0.413 0.247 0.266 0.266 0.278 0.322 Recess Dia., M, Ref. 4 4 4 4 4 4 3 3 3 3 4 Driver Size 0.164 0.164 0.201 0.201 0.224 0.246 0.117 0.137 0.137 0.149 0.152 0.191 0.191 0.191 0.191 ... ... 0.133 0.133 0.133 0.133 0.191 Recess Across Flats, M, Ref. 4R 4R 4R 4R ... ... 3R 3R 3R 3R 4R Driver Size [Note (6)] 0.100 0.100 0.100 0.100 ... ... 0.095 0.095 0.095 0.095 0.100 Max. 0.085 0.085 0.085 0.085 ... ... 0.080 0.080 0.080 0.080 0.085 Min. Recess Penetration Gaging Depth, P [Note (5)] Type III --`,,```,,,,````-`-`,,`,,`,`,,`--- NOTES: (1) Where specifying nominal size in decimals, zeros preceding the decimal and in the fourth decimal place shall be omitted. (2) Sizes 9⁄16, 5⁄8, and 3⁄4 are for machine screws only. (3) Sizes 7, 14, 16, 18, 20, and 24 are for tapping screws only. (4) For inspection of the recess and slot, see paras. 2.1.3 and 2.1.4, respectively. Due to the underfill of material caused by the combination recess, the minimum slot depths are approximately 10% lower than slotted pan heads. (5) Square recesses incorporate a slight taper on the sides of the recess. This taper can result in loss of penetration gaging depth on finished fasteners due to the buildup of plating in the recesses. The recess penetration dimensions specified here are for finished (plated) product. Manufacturers should be advised that they should not use all this tolerance in the heading process, or an out-of-tolerance condition could exist after plating. (6) “R” in the recess size tabulation means regular depth recess. 0.146 0.146 0.183 0.183 0.206 0.228 0.099 0.119 0.119 0.131 0.134 Min. Recess Penetration Gaging Depth, P [Note (5)] Max. Type IA Recess Dimensions for Combination Slotted-Pan Head Screws (Cont’d) GENERAL NOTES: (a) For additional requirements for machine screws, refer to sections 2 and 3, and for tapping screws refer to sections 2 and 4. (b) For head dimensions, refer to Table 18. 0.084 0.084 0.094 0.094 0.094 0.106 0.067 0.075 0.075 0.075 0.084 0.2160 0.2420 0.2500 0.2680 0.2940 12 14 1 ⁄4 16 18 ⁄16 20 24 3 ⁄8 7 ⁄16 1 ⁄2 Max. Slot Width, J Nominal Size or Basic Screw Diameter [Notes (1), (2), and (3)] Table 20 ASME B18.6.3-2010 ASME B18.6.3-2010 Table 21 Dimensions of Slotted Fillister Head Screws Nominal Size or Basic Screw Diameter [Notes (2), (3), and (4)] Max. 0000 0.0210 000 0.0340 00 0.0470 Head Diameter, A Slot Width, J Slot Depth, T Head Side Height, H Total Head Height, O Min. Max. Min. Max. Min. Max. Min. Max. Min. 0.038 0.059 0.082 0.032 0.053 0.072 0.019 0.029 0.037 0.011 0.021 0.028 0.025 0.035 0.047 0.015 0.027 0.039 0.008 0.012 0.017 0.004 0.006 0.010 0.012 0.017 0.022 0.006 0.011 0.015 0 1 2 3 0.0600 0.0730 0.0860 0.0990 0.096 0.118 0.140 0.161 0.083 0.104 0.124 0.145 0.043 0.053 0.062 0.070 0.038 0.045 0.053 0.061 0.055 0.066 0.083 0.095 0.047 0.058 0.066 0.077 0.023 0.026 0.031 0.035 0.016 0.019 0.023 0.027 0.025 0.031 0.037 0.043 0.015 0.020 0.025 0.030 4 5 6 7 0.1120 0.1250 0.1380 0.1510 0.183 0.205 0.226 0.248 0.166 0.187 0.208 0.229 0.079 0.088 0.096 0.105 0.069 0.078 0.086 0.094 0.107 0.120 0.132 0.144 0.088 0.100 0.111 0.122 0.039 0.043 0.048 0.048 0.031 0.035 0.039 0.039 0.048 0.054 0.060 0.065 0.035 0.040 0.045 0.049 8 10 12 14 0.1640 0.1900 0.2160 0.2420 0.270 0.313 0.357 0.400 0.250 0.292 0.334 0.376 0.113 0.130 0.148 0.165 0.102 0.118 0.134 0.151 0.156 0.180 0.205 0.230 0.133 0.156 0.178 0.201 0.054 0.060 0.067 0.075 0.045 0.050 0.056 0.064 0.071 0.083 0.094 0.105 0.054 0.064 0.074 0.084 1 ⁄4 ⁄16 3 ⁄8 7 ⁄16 0.2500 0.3125 0.3750 0.4375 0.414 0.518 0.622 0.625 0.389 0.490 0.590 0.589 0.170 0.211 0.253 0.265 0.155 0.194 0.233 0.242 0.237 0.295 0.355 0.368 0.207 0.262 0.315 0.321 0.075 0.084 0.094 0.094 0.064 0.072 0.081 0.081 0.109 0.137 0.164 0.170 0.087 0.110 0.133 0.135 1 ⁄2 ⁄16 5 ⁄8 3 ⁄4 0.5000 0.5625 0.6250 0.7500 0.750 0.812 0.875 1.000 0.710 0.768 0.827 0.945 0.297 0.336 0.375 0.441 0.273 0.308 0.345 0.406 0.412 0.466 0.521 0.612 0.362 0.410 0.461 0.542 0.106 0.118 0.133 0.149 0.091 0.102 0.116 0.131 0.190 0.214 0.240 0.281 0.151 0.172 0.193 0.226 5 9 GENERAL NOTES: (a) For additional requirements for machine screws, refer to sections 2 and 3, and for tapping screws refer to sections 2 and 4. (b) Applicable to screw types as indicated below. See referenced tables for thread and point dimensions and minimum practical screw lengths. (1) Type A thread forming, except short lengths, see Table 42. (2) Type AB thread forming, see Table 40. (3) Type B and BP thread forming, see Table 41; and Types BF and BT thread cutting, see Table 43. (4) Type C thread forming, see Mandatory Appendix VI; Types D, F, G, and T thread cutting, see Table 44; and Type TRS thread-rolling, see Table 45. (c) For recess dimensions, refer to Table 22. (d) For slot inspection, see para. 2.1.4. NOTES: (1) A slight rounding of the edges at periphery of head shall be permissible provided the diameter of the bearing circle is equal to no less than 90% of the specified minimum head diameter. (2) Where specifying nominal size in decimals, zeros preceding the decimal and in the fourth decimal place shall be omitted. (3) Sizes 0000, 000, 00, 9⁄16, 5⁄8, and 3⁄4 are for machine screws only. (4) Sizes 7 and 14 are for tapping screws only. 39 --`,,```,,,,````-`-`,,`,,`,`,,`--- Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Not for Resale Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS --`,,```,,,,````-`-`,,`,,`,`,,`--- 40 Not for Resale ⁄16 0.4375 1 ⁄2 0.5000 9 ⁄16 0.5625 5 ⁄8 0.6250 3 ⁄4 0.7500 0.406 0.428 0.456 0.575 0.621 0.252 0.274 0.274 0.315 0.382 12 14 1 ⁄4 5 ⁄16 3 ⁄8 7 0.136 0.159 0.170 0.175 0.192 5 0.1250 6 0.1380 7 0.1510 8 0.1640 10 0.1900 0.2160 0.2420 0.2500 0.3125 0.3750 0.060 0.067 0.097 0.105 0.115 Recess Dia., M, Ref. 0.0600 0.0730 0.0860 0.0990 0.1120 0 1 2 3 4 Nominal Size or Basic Screw Diameter [Notes (1)–(3)] M Type I 4 4 4 5 5 3 3 3 3 4 2 2 2 2 2 0 0 1 1 1 Driver Size 0.239 0.260 0.292 0.310 0.349 0.124 0.144 0.144 0.186 0.213 0.056 0.080 0.089 0.097 0.113 0.032 0.040 0.052 0.061 0.071 Max. 0.214 0.235 0.268 0.281 0.322 0.098 0.118 0.118 0.160 0.190 0.031 0.055 0.064 0.071 0.089 0.014 0.022 0.034 0.043 0.053 Min. Recess Penetration Gaging Depth, P Type I P 0.392 0.413 0.444 0.558 0.602 0.247 0.266 0.266 0.308 0.370 0.133 0.155 0.164 0.170 0.186 0.060 0.067 0.097 0.105 0.115 Recess Dia., M, Ref. 4 4 4 5 5 3 3 3 3 4 2 2 2 2 2 0 0 1 1 1 0.224 0.246 0.277 0.295 0.341 0.117 0.137 0.137 0.181 0.201 0.054 0.076 0.085 0.092 0.108 0.033 0.040 0.053 0.062 0.072 Max. 0.206 0.228 0.259 0.274 0.320 0.099 0.119 0.119 0.163 0.183 0.036 0.058 0.067 0.074 0.090 0.017 0.024 0.037 0.046 0.056 Min. Recess Penetration Gaging Depth, P Type IA Driver Size M P ... ... ... ... ... 0.133 0.133 0.133 0.191 0.191 0.091 0.091 0.091 0.112 0.112 ... ... 0.050 0.070 0.070 Recess Across Flats, M, Ref. ... ... ... ... ... 3R 3R 3R 4R 4R 1R 1R 1R 2R 2R ... ... 00 0 0 Driver Size [Note (4)] P ... ... ... ... ... 0.095 0.095 0.095 0.100 0.100 0.065 0.065 0.065 0.075 0.075 ... ... 0.033 0.038 0.038 Max. ... ... ... ... ... 0.080 0.080 0.080 0.085 0.085 0.050 0.050 0.050 0.060 0.060 ... ... 0.028 0.028 0.028 Min. Recess Penetration Gaging Depth, P [Note (5)] Type III M Type III Recess Dimensions for Fillister Head Screws Type IA Table 22 0.352 0.446 0.446 0.529 0.619 0.200 0.221 0.221 0.266 0.312 0.111 0.132 0.132 0.155 0.178 ... ... 0.069 0.094 0.101 Recess Dia., M Ref. T50 T55 T55 T60 T70 T27 T27 T30 T40 T45 T10 T15 T15 T20 T25 ... ... T6 T8 T10 Driver Size 0.169 0.190 0.190 0.230 0.295 0.090 0.090 0.120 0.125 0.155 0.055 0.055 0.060 0.071 0.090 ... ... 0.030 0.040 0.040 Max. 0.149 0.170 0.170 0.210 0.275 0.070 0.070 0.100 0.105 0.135 0.045 0.045 0.050 0.055 0.070 ... ... 0.025 0.035 0.030 Min. Recess Penetration Gaging Depth, P [Note (5)] Type VI M Type VI P 0.062 0.078 0.078 0.093 0.108 0.040 0.040 0.044 0.047 0.055 0.022 0.026 0.028 0.031 0.036 ... ... 0.012 0.015 0.016 Fallaway ASME B18.6.3-2010 --`,,```,,,,````-`-`,,`,,`,`,,`--- Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Recess Dimensions for Fillister Head Screws (Cont’d) GENERAL NOTES: (a) For additional requirements for machine screws, refer to sections 2 and 3, and for tapping screws refer to sections 2 and 4 (b) For head dimensions, refer to Table 21. (c) For recess inspection, see para. 2.1.3. NOTES: (1) Where specifying nominal size in decimals, zeros preceding the decimal and in the fourth decimal place shall be omitted. (2) Sizes 9⁄16, 5⁄8, and 3⁄4 are for machine screws only. (3) Sizes 7 and 14 are for tapping screws only. (4) “R” in the recess size tabulation means regular depth recess. (5) Square recesses incorporate a slight taper on the sides of the recess. This taper can result in loss of penetration gaging depth on finished fasteners due to the buildup of plating in the recesses. The recess penetration dimensions specified here are for finished (plated) product. Manufacturers should be advised that they should not use all this tolerance in the heading process, or an out-of-tolerance condition could exist after plating. Table 22 ASME B18.6.3-2010 41 Not for Resale ASME B18.6.3-2010 Head Diameter, A Head Side Height, H Total Head Height, O Slot Depth, T Nominal Size or Basic Screw Diameter [Note (3)] Max. Min. Max. Min. Max. Min. Max. Min. Max. 2 0.0860 3 0.0990 0.140 0.161 0.124 0.145 0.062 0.070 0.055 0.064 0.083 0.095 0.070 0.082 0.031 0.035 0.023 0.027 4 0.1120 5 0.1250 6 0.1380 0.183 0.205 0.226 0.166 0.187 0.208 0.079 0.088 0.096 0.072 0.081 0.089 0.107 0.120 0.132 0.094 0.106 0.118 0.039 0.043 0.048 8 0.1640 10 0.1900 12 0.2160 0.270 0.313 0.357 0.250 0.292 0.334 0.113 0.130 0.148 0.106 0.123 0.139 0.156 0.180 0.205 0.141 0.165 0.188 1 0.414 0.518 0.622 0.389 0.490 0.590 0.170 0.211 0.253 0.161 0.201 0.242 0.237 0.295 0.355 0.219 0.276 0.333 ⁄4 0.2500 ⁄16 0.3125 3 ⁄8 0.3750 5 Min. Drilled Hole Location, E, Basic [Note (1)] Drilled Hole Diameter, F, Basic [Note (1)] 0.030 0.034 0.022 0.026 0.026 0.030 0.031 0.037 0.031 0.035 0.039 0.038 0.042 0.045 0.030 0.033 0.035 0.035 0.038 0.043 0.037 0.046 0.046 0.054 0.060 0.067 0.045 0.050 0.056 0.065 0.075 0.087 0.054 0.064 0.074 0.043 0.043 0.053 0.046 0.046 0.046 0.075 0.084 0.094 0.064 0.072 0.081 0.102 0.130 0.154 0.087 0.110 0.134 0.062 0.078 0.094 0.062 0.070 0.070 Slot Width, J GENERAL NOTES: (a) For additional requirements, refer to sections 2 and 3. (b) For slot inspection, see para. 2.1.4. NOTES: (1) Drilled hole shall be approximately perpendicular to the axis of slot and may be permitted to break through bottom of the slot. Edges of the hole shall be free from burrs. (2) A slight rounding of the edges at periphery of head shall be permissible provided the diameter of the bearing circle is equal to no less than 90% of the specified minimum head diameter. (3) Where specifying nominal size in decimals, zeros preceding the decimal and in the fourth decimal place shall be omitted. 42 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Not for Resale --`,,```,,,,````-`-`,,`,,`,`,,`--- Table 23 Dimensions of Slotted Drilled Fillister Head Screws (Machine Screws Only) ASME B18.6.3-2010 Table 24 Dimensions of Slotted Truss Head Screws Head Diameter, A Head Height, H Nominal Size or Basic Screw Diameter [Notes (1)–(3)] Max. Min. Max. 0000 000 00 0 1 0.0210 0.0340 0.0470 0.0600 0.0730 0.049 0.077 0.106 0.131 0.164 0.043 0.071 0.098 0.119 0.149 2 3 4 5 6 0.0860 0.0990 0.1120 0.1250 0.1380 0.194 0.226 0.257 0.289 0.321 7 8 10 12 14 0.1510 0.1640 0.1900 0.2160 0.2420 1 ⁄4 16 18 5 ⁄16 20 24 3 ⁄8 ⁄16 1 ⁄2 9 ⁄16 5 ⁄8 3 ⁄4 7 Slot Width, J Slot Depth, T Min. Head Radius, R, Max. Max. Min. Max. Min. 0.014 0.022 0.030 0.037 0.045 0.010 0.018 0.024 0.029 0.037 0.032 0.051 0.070 0.087 0.107 0.009 0.013 0.017 0.023 0.026 0.005 0.009 0.010 0.016 0.019 0.009 0.013 0.018 0.022 0.027 0.005 0.009 0.012 0.014 0.018 0.180 0.211 0.241 0.272 0.303 0.053 0.061 0.069 0.078 0.086 0.044 0.051 0.059 0.066 0.074 0.129 0.151 0.169 0.191 0.211 0.031 0.035 0.039 0.043 0.048 0.023 0.027 0.031 0.035 0.039 0.031 0.036 0.040 0.045 0.050 0.022 0.026 0.030 0.034 0.037 0.352 0.384 0.448 0.511 0.557 0.333 0.364 0.425 0.487 0.530 0.094 0.102 0.118 0.134 0.146 0.081 0.088 0.103 0.118 0.129 0.231 0.254 0.283 0.336 0.375 0.048 0.054 0.060 0.067 0.075 0.039 0.045 0.050 0.056 0.064 0.054 0.058 0.068 0.077 0.085 0.041 0.045 0.053 0.061 0.068 0.2500 0.2680 0.2940 0.3125 0.3200 0.3720 0.573 0.609 0.661 0.698 0.713 0.817 0.546 0.580 0.630 0.666 0.680 0.780 0.150 0.159 0.173 0.183 0.186 0.213 0.133 0.141 0.153 0.162 0.165 0.190 0.375 0.410 0.446 0.457 0.484 0.557 0.075 0.075 0.084 0.084 0.084 0.094 0.064 0.064 0.072 0.072 0.072 0.081 0.087 0.093 0.100 0.106 0.108 0.123 0.070 0.074 0.080 0.085 0.087 0.100 0.3750 0.4375 0.5000 0.5625 0.6250 0.7500 0.823 0.948 1.073 1.198 1.323 1.573 0.787 0.907 1.028 1.149 1.269 1.511 0.215 0.248 0.280 0.312 0.345 0.410 0.191 0.221 0.250 0.279 0.309 0.368 0.538 0.619 0.701 0.783 0.863 1.024 0.094 0.094 0.106 0.118 0.133 0.149 0.081 0.081 0.091 0.102 0.116 0.131 0.124 0.142 0.161 0.179 0.196 0.234 0.100 0.116 0.131 0.146 0.162 0.182 GENERAL NOTES: (a) For additional requirements for machine screws, refer to sections 2 and 3, and for tapping screws refer to sections 2 and 4. (b) For recess dimensions refer to Table 25. (c) Applicable to screw types as indicated below. See referenced tables for thread and point dimensions and minimum practical screw lengths. (1) Type A thread forming, except short lengths, see Table 42. (2) Type AB thread forming, see Table 40. (3) Type B and BP thread forming, see Table 41; and Types BF and BT thread cutting, see Table 43. (4) Type C thread forming, see Mandatory Appendix VI; Types D, F, G, and T thread cutting, see Table 44; and Type TRS thread-rolling, see Table 45. (d) For slot inspection, see para. 2.1.4. NOTES: (1) Where specifying nominal size in decimals, zeros preceding the decimal and in the fourth decimal place shall be omitted. (2) Sizes 0000, 000, 00, 9⁄16, 5⁄8, and 3⁄4 are for machine screws only. (3) Sizes 7, 14, 16, 18, 20 and 24 are for tapping screws only. --`,,```,,,,````-`-`,,`,,`,`,,`--- Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS 43 Not for Resale Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS 44 Not for Resale 0.256 0.260 0.316 0.345 8 0.1640 10 0.1900 12 0.2160 14 0.2420 1 3 3 4 4 2 2 3 3 1 1 2 2 0 0 1 1 Driver Size M Type IA 0.126 0.134 0.145 0.173 0.088 0.104 0.111 0.126 0.062 0.078 0.073 0.080 0.030 0.038 0.052 0.059 Max. 0.101 0.109 0.121 0.148 0.063 0.079 0.086 0.101 0.044 0.060 0.048 0.055 0.012 0.020 0.034 0.042 Min. Recess Penetration Gaging Depth, P Type I --`,,```,,,,````-`-`,,`,,`,`,,`--- 0.166 0.181 0.241 0.256 0.1120 0.1250 0.1380 0.1510 4 5 6 7 ⁄4 0.2500 16 0.2680 18 0.2940 5 ⁄16 0.3125 0.105 0.121 0.151 0.158 0.0600 0.0730 0.0860 0.0990 0.056 0.064 0.097 0.103 Recess Dia., M, Ref. P 0 1 2 3 Nominal Size or Basic Screw Diameter [Notes (1), (2), (3)] M Type I 0.241 0.250 0.300 0.326 0.155 0.171 0.227 0.242 0.101 0.117 0.141 0.148 0.055 0.063 0.091 0.098 Recess Dia., M, Ref. P Table 25 3 3 4 4 2 2 3 3 1 1 2 2 0 0 1 1 Driver Size 0.115 0.123 0.133 0.161 0.079 0.095 0.101 0.115 0.059 0.075 0.065 0.072 0.030 0.038 0.049 0.056 Max. 0.097 0.105 0.115 0.143 0.061 0.077 0.083 0.097 0.043 0.059 0.047 0.054 0.014 0.022 0.033 0.040 Min. Recess Penetration Gaging Depth, P Type IA M Type III 0.133 0.191 0.191 0.191 0.112 0.112 0.133 0.133 0.070 0.091 0.091 0.091 ... ... 0.050 0.070 Recess Across Flats, M, Ref. P 3S 4R 4R 4R 2S 2R 3S 3S 0 1S 1S 1S ... ... 00 0 Driver Size (4) 0.080 0.100 0.100 0.100 0.063 0.075 0.080 0.080 0.038 0.055 0.055 0.055 ... ... 0.033 0.038 Max. 0.065 0.085 0.085 0.085 0.048 0.060 0.065 0.065 0.028 0.040 0.040 0.040 ... ... 0.028 0.028 Min. M Type VI Recess Penetration Gaging Depth, P [Note (5)] Type III Recess Dimensions for Truss Head Screws 0.200 0.221 0.221 0.266 0.132 0.155 0.178 0.200 ... ... 0.111 0.132 ... ... ... ... Recess Dia., M, Ref. P T27 T30 T30 T40 T15 T20 T25 T27 ... ... T10 T15 ... ... ... ... Driver Size 0.090 0.085 0.090 0.095 0.055 0.071 0.090 0.090 ... ... 0.055 0.045 ... ... ... ... Max. 0.070 0.070 0.075 0.080 0.045 0.055 0.070 0.070 ... ... 0.045 0.035 ... ... ... ... Min. Recess Penetration Gaging Depth, P Type VI 0.062 min. 0.040 0.042 0.045 0.047 0.026 0.031 0.036 0.040 ... ... 0.022 0.024 ... ... ... ... Fallaway ASME B18.6.3-2010 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS 0.350 0.376 0.376 0.407 0.437 0.439 0.547 0.608 20 0.3200 24 0.3720 3 ⁄8 0.3750 7 ⁄16 0.4375 1 ⁄2 0.5000 ⁄16 0.5625 5 ⁄8 0.6250 3 ⁄4 0.7500 45 Not for Resale 4 4 5 5 4 4 4 4 Driver Size 0.268 0.282 0.289 0.351 0.177 0.206 0.206 0.237 Max. 0.243 0.258 0.256 0.319 0.151 0.182 0.182 0.212 Min. Recess Penetration Gaging Depth, P 0.415 0.420 0.524 0.581 0.330 0.358 0.357 0.387 Recess Dia., M, Ref. 4 4 5 5 4 4 4 4 Driver Size 0.251 0.256 0.266 0.323 0.164 0.192 0.192 0.223 Max. 0.233 0.238 0.245 0.302 0.146 0.174 0.174 0.205 Min. Recess Penetration Gaging Depth, P Type IA ... ... ... ... 0.191 0.191 0.191 ... Recess Across Flats, M, Ref. ... ... ... ... 4R 4R 4R ... Driver Size [Note (4)] ... ... ... ... 0.100 0.100 0.100 ... Max. ... ... ... ... 0.085 0.085 0.085 ... Min. Recess Penetration Gaging Depth, P [Note (5)] Type III 0.352 0.446 0.446 0.529 0.266 0.312 0.312 0.312 Recess Dia., M Ref. T50 T55 T55 T60 T40 T45 T45 T45 Driver Size 0.150 0.190 0.190 0.230 0.100 0.100 0.125 0.155 Max. 0.130 0.165 0.165 0.210 0.085 0.085 0.110 0.130 Min. Recess Penetration Gaging Depth, P Type VI 0.062 0.078 0.078 0.093 0.050 0.052 0.055 0.055 Fallaway GENERAL NOTES: (a) For additional requirements for machine screws, refer to sections 2 and 3, and for tapping screws refer to sections 2 and 4. (b) For head dimensions, refer to Table 24. Unless otherwise specified, recessed truss head screws may be supplied with either a full contour or flat top design at the option of the supplier. (c) For recess inspection, see para. 2.1.3. NOTES: (1) Where specifying nominal size in decimals, zeros preceding the decimal and in the fourth decimal place shall be omitted. (2) Sizes 9⁄16, 5⁄8, and 3⁄4 are for machine screws only. (3) Sizes 7, 14, 16, 18, 20 and 24 are for tapping screws only. (4) “R” in the recess size tabulation means regular depth recess, and the “S” means short depth recess. (5) Square recesses incorporate a slight taper on the sides of the recess. This taper can result in loss of penetration gaging depth on finished fasteners due to the buildup of plating in the recesses. The recess penetration dimensions specified here are for finished (plated) product. Manufacturers should be advised that they should not use all this tolerance in the heading process, or an out-of-tolerance condition could exist after plating. 9 Recess Dia., M, Ref. Nominal Size or Basic Screw Diameter [Notes (1), (2), (3)] Type I Recess Dimensions for Truss Head Screws (Cont’d) --`,,```,,,,````-`-`,,`,,`,`,,`--- Table 25 ASME B18.6.3-2010 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS 46 Not for Resale T H P 0.039 0.043 0.048 0.048 0.054 0.060 0.067 0.075 0.1120 0.1250 0.1380 0.1510 4 5 6 7 8 0.1640 10 0.1900 12 0.2160 14 0.2420 0.023 0.026 0.031 0.035 0.0600 0.0730 0.0860 0.0990 Max. 0.045 0.050 0.056 0.064 0.031 0.035 0.039 0.039 0.016 0.019 0.023 0.027 Min. Slot Width, J M 0 1 2 3 Nominal Size or Basic Screw Diameter [Notes (1), (2), (3)] A J Type I With Slot 0.058 0.068 0.077 0.085 0.040 0.045 0.050 0.054 0.022 0.027 0.031 0.036 Max. 0.040 0.048 0.055 0.063 0.027 0.030 0.033 0.037 0.013 0.016 0.020 0.023 Min. Slot Depth, D [Note (4)] L 0.166 0.181 0.241 0.256 0.105 0.121 0.151 0.158 0.056 0.064 0.097 0.103 Recess Dia., M, Ref. A T M 2 2 3 3 1 1 2 2 0 0 1 1 Driver Size Type III With Slot J Type I H P 0.088 0.104 0.111 0.126 0.062 0.078 0.073 0.080 0.030 0.038 0.052 0.059 Max. 0.063 0.079 0.086 0.101 0.044 0.060 0.048 0.055 0.012 0.020 0.034 0.042 Min. Recess Penetration Gaging Depth, P L 0.112 0.112 0.133 0.133 0.070 0.091 0.091 0.091 ... ... 0.050 0.070 Recess Across Flats, M, Ref. Dimensions of Combination Slotted Truss Head Screws --`,,```,,,,````-`-`,,`,,`,`,,`--- Table 26 2S 2R 3S 3S 0 1S 1S 1S ... ... 00 0 Driver Size [Note (5)] Type III 0.063 0.075 0.080 0.080 0.038 0.055 0.055 0.055 ... ... 0.033 0.038 Max. 0.048 0.060 0.065 0.065 0.028 0.040 0.040 0.040 ... ... 0.028 0.028 Min. Recess Penetration Gaging Depth, P [Note (6)] 0.062 min. ASME B18.6.3-2010 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS --`,,```,,,,````-`-`,,`,,`,`,,`--- 0.084 0.094 0.094 0.094 20 0.3200 24 0.3720 3 ⁄8 0.3750 7 ⁄16 0.4375 47 Not for Resale 0.091 0.102 0.116 0.131 0.072 0.081 0.081 0.081 0.064 0.064 0.072 0.072 Min. 0.161 0.179 0.196 0.234 0.108 0.123 0.124 0.142 0.087 0.093 0.100 0.106 Max. 0.118 0.131 0.146 0.164 0.082 0.087 0.090 0.104 0.063 0.069 0.075 0.076 Min. Slot Depth, D [Note (4)] 0.437 0.439 0.547 0.608 0.349 0.376 0.376 0.407 0.256 0.260 0.316 0.345 Recess Dia., M, Ref. 4 4 5 5 4 4 4 4 3 3 4 4 Driver Size Type I 0.268 0.282 0.289 0.351 0.177 0.206 0.206 0.237 0.126 0.134 0.145 0.173 Max. 0.243 0.258 0.256 0.319 0.151 0.182 0.182 0.212 0.101 0.109 0.121 0.148 Min. Recess Penetration Gaging Depth, P ... ... ... ... 0.191 0.191 0.191 ... 0.133 0.191 0.191 0.191 Recess Across Flats, M, Ref. Dimensions of Combination Slotted Truss Head Screws (Cont’d) ... ... ... ... 4R 4R 4R ... 3S 4R 4R 4R Driver Size [Note (5)] Type III ... ... ... ... 0.100 0.100 0.100 ... 0.080 0.100 0.100 0.100 Max. ... ... ... ... 0.085 0.085 0.085 ... 0.065 0.085 0.085 0.085 Min. Recess Penetration Gaging Depth, P [Note (6)] GENERAL NOTES: (a) For additional requirements for machine screws, refer to sections 2 and 3, and for tapping screws refer to sections 2 and 4. (b) For head dimensions, refer to Table 24. NOTES: (1) Where specifying nominal size in decimals, zeros preceding the decimal and in the fourth decimal place shall be omitted. (2) Sizes 9⁄16, 5⁄8, and 3⁄4 are for machine screws only. (3) Sizes 7, 14, 16, 18, 20 and 24 are for tapping screws only. (4) For inspection of the recess and slot, see paras. 2.1.3 and 2.1.4, respectively. Due to the underfill of material caused by the combination recess, the minimum slot depths are approximately 10% lower than slotted truss head. (5) “R” in the recess size tabulation means regular depth recess, and the “S” means short depth recess. (6) Square recesses incorporate a slight taper on the sides of the recess. This taper can result in loss of penetration gaging depth on finished fasteners due to the buildup of plating in the recesses. The recess penetration dimensions specified here are for finished (plated) product. Manufacturers should be advised that they should not use all this tolerance in the heading process, or an out-of-tolerance condition could exist after plating. 9 0.106 0.118 0.133 0.149 0.075 0.075 0.084 0.084 1 ⁄4 0.2500 16 0.2680 18 0.2940 5 ⁄16 0.3125 1 ⁄2 0.5000 ⁄16 0.5625 5 ⁄8 0.6250 3 ⁄4 0.7500 Max. Slot Width, J Nominal Size or Basic Screw Diameter [Notes (1), (2), (3)] Table 26 ASME B18.6.3-2010 ASME B18.6.3-2010 Table 27 Dimensions of Slotted Binding Head Screws (Machine Screws Only) Total Head Height, O Head Oval Height, F Undercut Diameter, U [Note (2)] Undercut Depth, X [Note (2)] Max. Min. Max. Min. Max. Min. Max. Min. Max. Min. Max. Min. Max. Min. 0000 0.0210 000 0.0340 00 0.0470 0.046 0.073 0.098 0.040 0.067 0.090 0.014 0.021 0.028 0.009 0.015 0.023 0.006 0.008 0.011 0.003 0.005 0.007 0.008 0.012 0.017 0.004 0.006 0.010 0.009 0.013 0.018 0.005 0.009 0.012 . . .. ... ... ... ... ... ... ... ... ... ... ... 0.0600 0.0730 0.0860 0.0990 0.126 0.153 0.181 0.208 0.119 0.145 0.171 0.197 0.032 0.041 0.050 0.059 0.026 0.035 0.043 0.052 0.012 0.015 0.018 0.022 0.008 0.011 0.013 0.016 0.023 0.026 0.031 0.035 0.016 0.019 0.023 0.027 0.018 0.024 0.030 0.036 0.009 0.014 0.020 0.025 0.098 0.120 0.141 0.162 0.086 0.105 0.124 0.143 0.007 0.008 0.010 0.011 0.002 0.003 0.005 0.006 4 0.1120 5 0.1250 6 0.1380 0.235 0.263 0.290 0.223 0.249 0.275 0.068 0.078 0.087 0.061 0.069 0.078 0.025 0.029 0.032 0.018 0.021 0.024 0.039 0.043 0.048 0.031 0.035 0.039 0.042 0.048 0.053 0.030 0.035 0.040 0.184 0.205 0.226 0.161 0.180 0.199 0.012 0.014 0.015 0.007 0.009 0.010 8 0.1640 10 0.1900 12 0.2160 0.344 0.399 0.454 0.326 0.378 0.430 0.105 0.123 0.141 0.095 0.112 0.130 0.039 0.045 0.052 0.029 0.034 0.039 0.054 0.060 0.067 0.045 0.050 0.056 0.065 0.077 0.089 0.050 0.060 0.070 0.269 0.312 0.354 0.236 0.274 0.311 0.017 0.020 0.023 0.012 0.015 0.018 1 ⁄4 0.2500 ⁄16 0.3125 3 ⁄8 0.3750 0.525 0.656 0.788 0.498 0.622 0.746 0.165 0.209 0.253 0.152 0.194 0.235 0.061 0.077 0.094 0.046 0.059 0.071 0.075 0.084 0.094 0.064 0.072 0.081 0.105 0.134 0.163 0.084 0.108 0.132 0.410 0.513 0.615 0.360 0.450 0.540 0.026 0.032 0.039 0.021 0.027 0.034 0 1 2 3 5 Slot Width, J Slot Depth, T GENERAL NOTES: (a) For additional requirements, refer to sections 2 and 3. (b) For recess dimensions, refer to Table 28. (c) For slot inspection, see para. 2.1.4. NOTES: (1) Break sharp edge on head where spherical and conical surfaces meet. (2) Unless otherwise specified by purchaser, slotted binding head machine screws shall not be undercut. (3) Where specifying nominal size in decimals, zeros preceding the decimal and in the fourth decimal place shall be omitted. 48 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Not for Resale --`,,```,,,,````-`-`,,`,,`,`,,`--- Head Diameter, A Nominal Size or Basic Screw Diameter [Note (3)] ASME B18.6.3-2010 Table 28 Recess Dimensions for Binding Head Screws (Machine Screws Only) Type I Type IA P P M M P Type III M Nominal Size or Basic Screw Diameter [Note (1)] Recess Dia., M, Ref. Driver Size Type IA Recess Penetration Gaging Depth, P Max. Min. Recess Dia., M, Ref. Driver Size Type III Recess Penetration Gaging Depth, P Max. Min. Recess Across Flats, M, Ref. Recess Penetration Gaging Depth, P [Note (3)] Driver Size (2) Max. Min. 0 1 2 3 0.0600 0.0730 0.0860 0.0990 0.060 0.067 0.093 0.103 0 0 1 1 0.033 0.040 0.051 0.061 0.016 0.023 0.034 0.044 0.060 0.067 0.097 0.102 0 0 1 1 0.034 0.043 0.054 0.059 0.018 0.027 0.038 0.043 ... ... ... 0.070 ... ... ... 0 ... ... ... 0.038 ... ... ... 0.023 4 5 6 8 0.1120 0.1250 0.1380 0.1640 0.111 0.141 0.153 0.179 1 2 2 2 0.070 0.064 0.077 0.103 0.052 0.040 0.053 0.079 0.110 0.137 0.149 0.174 1 2 2 2 0.068 0.059 0.072 0.097 0.052 0.041 0.054 0.079 0.070 0.091 0.091 0.112 0 1S 1S 2S 0.038 0.055 0.055 0.063 0.023 0.040 0.040 0.048 10 12 1 ⁄4 5 ⁄16 3 ⁄8 0.1900 0.2160 0.2500 0.3125 0.3750 0.198 0.260 0.274 0.343 0.393 2 3 3 4 4 0.123 0.134 0.147 0.175 0.227 0.098 0.109 0.123 0.152 0.203 0.192 0.253 0.267 0.332 0.380 2 3 3 4 4 0.115 0.125 0.139 0.163 0.213 0.097 0.107 0.121 0.145 0.195 0.112 0.133 0.133 0.191 0.191 2S 3S 3S 4R 4R 0.063 0.080 0.080 0.100 0.100 0.048 0.065 0.065 0.080 0.080 GENERAL NOTES: (a) For additional requirements, refer to sections 2 and 3. (b) For head dimensions, refer to Table 27. (c) For recess inspection, see para. 2.1.3. NOTES: (1) Where specifying nominal size in decimals, zeros preceding the decimal and in the fourth decimal place shall be omitted. (2) “R” in the recess size tabulation means regular depth recess, and the “S” means short depth recess. (3) Square recesses incorporate a slight taper on the sides of the recess. This taper can result in loss of penetration gaging depth on finished fasteners due to the buildup of plating in the recesses. The recess penetration dimensions specified here are for finished (plated) product. Manufacturers should be advised that they should not use all this tolerance in the heading process, or an out-oftolerance condition could exist after plating. 49 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Not for Resale --`,,```,,,,````-`-`,,`,,`,`,,`--- Type I Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS 50 Not for Resale 0.0730 0.0860 0.0990 0.1120 0.1250 0.1380 0.1510 0.1640 0.1900 0.2160 0.2420 0.2500 0.3125 1 2 3 4 5 6 7 8 10 12 14 1 ⁄4 5 ⁄16 Nominal Size or Basic Screw Diameter [Notes (1), (9)] 0.312 0.312 0.375 0.375 0.500 0.188 0.188 0.250 0.250 0.250 0.125 0.125 0.188 A 0.305 0.305 0.367 0.367 0.489 0.181 0.181 0.244 0.244 0.244 0.120 0.120 0.181 Min. --`,,```,,,,````-`-`,,`,,`,`,,`--- 0.340 0.340 0.409 0.409 0.545 0.202 0.202 0.272 0.272 0.272 0.134 0.134 0.202 Across Corners, W, Min. [Notes (3), (4)] Regular Head [Note (7)] Width Across Flats, A [Note (3)] Max. A H ... 0.375 0.438 0.438 ... 0.219 0.250 ... ... 0.312 ... ... ... Max. ... 0.367 0.428 0.428 ... 0.213 0.244 ... ... 0.305 ... ... ... Min. H Gaging ring ... 0.409 0.477 0.477 ... 0.238 0.272 ... ... 0.340 ... ... ... Across Corners, W, Min. [Notes (3), (4)] 0.120 0.155 0.190 0.190 0.230 0.060 0.070 0.093 0.093 0.110 0.044 0.050 0.055 Max. 0.105 0.139 0.172 0.172 0.208 0.049 0.058 0.080 0.080 0.096 0.036 0.040 0.044 Min. Head Height, H H Trimmed or Fully Upset Head Indented Head See Note (2) Large Head [Notes (7), (8)] J T H Width Across Flats, A [Note (3)] Slot may be at random to hex flats - see Note (5) J T 0.060 0.067 0.075 0.075 0.084 0.039 0.043 0.048 0.048 0.054 ... ... ... Max. 0.050 0.056 0.064 0.064 0.072 0.031 0.035 0.039 0.039 0.045 ... ... ... Min. Slot Width, J [Note (5)] L W dia. 0.072 0.093 0.101 0.101 0.122 0.036 0.042 0.046 0.054 0.066 ... ... ... Max. 0.057 0.077 0.083 0.083 0.100 0.025 0.030 0.033 0.040 0.052 ... ... ... Min. Slot Depth, T [Notes (5), (6)] F Dimensions of Plain (Unslotted) and Slotted Regular and Large Hex Head Screws Shape of indentation optional Table 29 0.063 0.083 0.103 0.103 0.125 0.029 0.035 0.048 0.048 0.058 0.022 0.024 0.026 Protrusion Beyond Gaging Ring, F, Min. [Note (4)] ASME B18.6.3-2010 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS 0.3200 0.3720 0.3750 0.4375 0.5000 0.500 0.562 0.562 0.625 0.750 Max. 0.489 0.551 0.551 0.610 0.735 Min. Width Across Flats, A [Note (3)] 0.545 0.614 0.614 0.682 0.820 Across Corners, W, Min. [Notes (3), (4)] Regular Head [Note (7)] ... ... ... ... ... Max. ... ... ... ... ... Min. Width Across Flats, A [Note (3)] ... ... ... ... ... Across Corners, W, Min. [Notes (3), (4)] Large Head [Notes (7), (8)] 0.230 0.295 0.295 0.348 0.400 Max. 0.208 0.270 0.270 0.321 0.367 Min. Head Height, H 0.084 0.094 0.094 ... ... Max. 0.072 0.081 0.081 ... ... Min. Slot Width, J [Note (5)] 0.122 0.156 0.156 ... ... Max. 0.100 0.131 0.131 ... ... Min. Slot Depth, T [Notes (5), (6)] Dimensions of Plain (Unslotted) and Slotted Regular and Large Hex Head Screws (Cont’d) 0.125 0.162 0.162 0.193 0.220 Protrusion Beyond Gaging Ring, F, Min. [Note (4)] GENERAL NOTES: (a) For additional requirements for machine screws, refer to sections 2 and 3, and for tapping screws refer to sections 2 and 4. (b) For recess dimensions, refer to Table 30. (c) Applicable to screw types as indicated below. See referenced tables for thread and point dimensions and minimum practical screw lengths. (1) Type A thread forming, except short lengths, see Table 42. (2) Type AB thread forming, see Table 40. (3) Type B and BP thread forming, see Table 41; and Types BF and BT thread cutting, see Table 43. (4) Type C thread forming, see Mandatory Appendix VI; Types D, F, G, and T thread cutting, see Table 44; and Type TRS thread-rolling, see Table 45. (d) For slot inspection, see para. 2.1.4. NOTES: (1) Where specifying nominal size in decimals, zeros preceding the decimal and in the fourth decimal place shall be omitted. (2) A slight rounding of all edges and corners of the hex surfaces of indented hex heads shall be permissible provided the diameter of the bearing circle is equal to no less than 90% of the specified minimum width-across-flats dimension. (3) Dimensions across flats and across corners of the head shall be measured at the point of maximum metal. The taper of the sides of the hex (the angle between one side and the axis) shall not exceed 2 deg or 0.004 in., whichever is greater, the specified width across flats being the large dimension. (4) The rounding due to lack of fill on all six corners of the head shall be reasonably uniform, and the width across corners of the head shall be such that when a sharp ring having an inside diameter equal to the specified minimum width across corners is placed on the top and bottom of the head, the head shall protrude by an amount equal to or greater than the F value tabulated. See Mandatory Appendix II for across-corners gaging of hex heads. (5) Unless otherwise specified by the purchaser, hex head machine screws are not slotted. (6) Slot depth beyond the bottom of the indentation on indented heads shall not be less than one-third of the minimum slot depth specified. (7) Unless otherwise specified by the purchaser, regular hex heads shall be furnished, and both regular and large head styles may be indented head, trimmed head, or fully upset head construction, at the option of the manufacturer. (8) Large hex heads are intended for screw and washer assemblies (sems) as specified in ASME B18.13, and other applications requiring large bearing. (9) Sizes 7, 14, 20 and 24 are for tapping screws only. 20 24 3 ⁄8 7 ⁄16 1 ⁄2 Nominal Size or Basic Screw Diameter [Notes (1), (9)] --`,,```,,,,````-`-`,,`,,`,`,,`--- Table 29 ASME B18.6.3-2010 51 Not for Resale ASME B18.6.3-2010 Table 30 Recess Dimensions for Indented Regular and Large Hex Head Screws Shape of indentation optional Gaging ring See Note (2) P F A H H L Type I Nominal Size or Basic Screw Diameter [Notes (1), (2), (3)] --`,,```,,,,````-`-`,,`,,`,`,,`--- M Type VI Recess Penetration Gaging Depth, P Recess Penetration Gaging Depth, P Recess Dia., M, Ref. Driver Size Max. Min. Recess Dia., M, Ref. Driver Size Max. Min. Fallaway 1 2 3 4 0.0730 0.0860 0.0990 0.1120 0.072 0.086 0.092 0.097 0 1 1 1 0.054 0.054 0.060 0.067 0.036 0.036 0.042 0.049 ... ... ... 0.111 ... ... ... T10 ... ... ... 0.040 ... ... ... 0.035 ... ... ... 0.022 5 6 7 8 0.1250 0.1380 0.1510 0.1640 0.105 0.148 0.148 0.168 1 2 2 2 0.076 0.089 0.089 0.115 0.058 0.064 0.064 0.090 0.111 0.132 0.132 0.155 T10 T15 T15 T20 0.050 0.051 0.051 0.065 0.040 0.040 0.040 0.050 0.022 0.026 0.026 0.031 10 12 14 1 ⁄4 0.1900 0.2160 0.2420 0.2500 0.178 0.247 0.277 0.277 2 3 3 3 0.127 0.152 0.186 0.186 0.102 0.127 0.161 0.161 0.178 0.200 0.221 0.221 T25 T27 T30 T30 0.080 0.080 0.095 0.095 0.065 0.065 0.080 0.080 0.036 0.040 0.044 0.044 0.3125 0.3200 0.3720 0.3750 0.359 0.359 0.387 0.387 4 4 4 4 0.234 0.234 0.267 0.267 0.210 0.210 0.243 0.243 0.266 0.266 0.312 0.312 T40 T40 T45 T45 0.125 0.125 0.155 0.155 0.100 0.100 0.125 0.125 0.047 0.047 0.055 0.055 5 ⁄16 20 24 3 ⁄8 GENERAL NOTES: (a) For additional requirements for machine screws, refer to sections 2 and 3, and for tapping screws refer to sections 2 and 4. (b) For head dimensions, refer to Table 29. (c) For recess inspection, see para. 2.1.3. NOTES: (1) Where specifying nominal size in decimals, zeros preceding the decimal and in the fourth decimal place shall be omitted. (2) A slight rounding of all edges and corners of the hex surfaces of indented hex heads shall be permissible provided the diameter of the bearing circle is equal to no less than 90% of the specified minimum width-across-flats dimension. (3) Sizes 7, 14, 20 and 24 are for tapping screws only. 52 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Not for Resale ASME B18.6.3-2010 Table 31 Recess Dimensions for Type I Nonindented Regular and Large Hex Head Screws T Gaging ring See Note (2) See Note (2) F M A L H H Trimmed or Fully Upset Head Nominal Size or Basic Screw Diameter [Note (1)] 8 10 12 1 ⁄4 5 ⁄16 3 ⁄8 0.1640 0.1900 0.2160 0.2500 0.3125 0.3750 Recess Penetration Gaging Depth, P Recess Dia., M, Ref. Driver Size Max. Min. 0.183 0.198 0.262 0.277 0.359 0.387 2 2 3 3 4 4 0.110 0.125 0.139 0.154 0.196 0.225 0.087 0.102 0.116 0.131 0.174 0.203 GENERAL NOTES: (a) For additional requirements for machine screws, refer to sections 2 and 3, and for tapping screws refer to sections 2 and 4. (b) For head dimensions, refer to Table 29. (c) For recess inspection, see para. 2.1.3. NOTES: (1) Where specifying nominal size in decimals, zeros preceding the decimal and in the fourth decimal place shall be omitted. (2) A slight rounding of all edges and corners of the hex surfaces of indented hex heads shall be permissible provided the diameter of the bearing circle is equal to no less than 90% of the specified minimum width-across-flats dimension. --`,,```,,,,````-`-`,,`,,`,`,,`--- Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS 53 Not for Resale 54 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Not for Resale 0.125 0.125 0.188 0.188 0.250 0.250 0.250 0.312 0.312 0.375 0.375 0.500 6 0.1380 7 0.1510 8 0.1640 10 0.1900 12 0.2160 14 0.2420 1 ⁄4 0.2500 5 ⁄16 0.3125 Max. 0.305 0.367 0.367 0.489 0.244 0.244 0.244 0.305 0.120 0.120 0.181 0.181 Min. Width Across Flats, A [Note (5)] 0.0860 0.0990 0.1120 0.1250 2 3 4 5 Nominal Size or Basic Screw Diameter [Note (4)] 0.340 0.409 0.409 0.545 0.272 0.272 0.272 0.340 0.134 0.134 0.202 0.202 Width Across Corners W, Min. [Notes (5), (6)] Table 32 0.155 0.190 0.190 0.230 0.093 0.093 0.110 0.120 0.050 0.055 0.060 0.070 Max. 0.139 0.172 0.172 0.208 0.080 0.080 0.096 0.105 0.040 0.044 0.049 0.058 Min. Head Height, H 0.432 0.520 0.520 0.676 0.328 0.328 0.348 0.414 0.166 0.177 0.243 0.260 Max. 0.398 0.480 0.480 0.624 0.302 0.302 0.322 0.384 0.154 0.163 0.225 0.240 Min. Washer Diameter, B 0.039 0.050 0.050 0.055 0.025 0.029 0.031 0.031 0.016 0.016 0.019 0.025 Max. 0.067 0.075 0.075 0.084 0.048 0.048 0.054 0.060 ... ... 0.039 0.043 Max. Min. 0.056 0.064 0.064 0.072 0.039 0.039 0.045 0.050 ... ... 0.031 0.035 Slot Width, J --`,,```,,,,````-`-`,,`,,`,`,,`--- 0.022 0.030 0.030 0.035 0.015 0.017 0.019 0.019 0.010 0.010 0.011 0.015 Min. Washer Thickness, U Dimensions of Plain and Slotted Hex Washer Head Screws 0.103 0.111 0.111 0.134 0.053 0.053 0.074 0.080 ... ... 0.042 0.049 Max. 0.077 0.083 0.083 0.100 0.033 0.033 0.052 0.057 ... ... 0.025 0.030 Min. Slot Depth, T [Note (7)] 0.083 0.103 0.103 0.125 0.048 0.048 0.058 0.063 0.024 0.026 0.029 0.035 Protrusion Beyond Gaging Ring, F, Min. [Note (6)] ASME B18.6.3-2010 55 Not for Resale 0.500 0.562 0.562 0.625 0.750 0.489 0.551 0.551 0.610 0.735 0.545 0.614 0.614 0.682 0.820 Width Across Corners W, Min. [Notes (5), (6)] 0.230 0.295 0.295 0.348 0.400 Max. 0.208 0.270 0.270 0.321 0.367 Min. Head Height, H 0.676 0.780 0.780 0.870 1.040 Max. 0.624 0.720 0.720 0.790 0.960 Min. Washer Diameter, B 0.055 0.063 0.063 0.073 0.085 Max. 0.035 0.037 0.037 0.043 0.050 Min. Washer Thickness, U 0.084 0.084 0.094 0.094 0.106 Max. 0.072 0.072 0.081 0.081 0.091 Min. Slot Width, J [Note (1)] Dimensions of Plain and Slotted Hex Washer Head Screws (Cont’d) 0.134 0.134 0.168 0.175 0.195 Max. 0.100 0.100 0.131 0.140 0.155 Min. Slot Depth, T [Notes (1), (7)] 0.125 0.162 0.162 0.193 0.220 Protrusion Beyond Gaging Ring, F, Min. [Note (6)] GENERAL NOTES: (a) For additional requirements for machine screws, refer to sections 2 and 3, and for tapping screws refer to sections 2 and 4. (b) For recess dimensions, refer to Table 33. (c) Applicable to screw types as indicated below. See referenced tables for thread and point dimensions and minimum practical screw lengths. (1) Type A thread forming, except short lengths, see Table 42. (2) Type AB thread forming, see Table 40. (3) Type B and BP thread forming, see Table 41; and Types BF and BT thread cutting, see Table 43. (4) Type C thread forming, see Mandatory Appendix VI; Types D, F, G, and T thread cutting, see Table 44; and Type TRS thread-rolling, see Table 45. (d) For slot inspection, see para. 2.1.4. NOTES: (1) Unless otherwise specified by the purchaser, hex washer head screws are not slotted. (2) Fillet radius, R, at the junction of the sides of the hex and the top of the washer shall not exceed 0.15 times the basic screw diameter. (3) A slight rounding of all edges and corners of the hex surfaces shall be permissible. (4) Where specifying nominal size in decimals, zeros preceding the decimal and in the fourth decimal place shall be omitted. (5) Dimensions across flats and across corners of the head shall be measured at the point of maximum metal. The taper of the sides of the hex (the angle between one side and the axis) shall not exceed 2 deg or 0.004 in., whichever is greater, the specified width across flats being the large dimension. (6) The rounding due to lack of fill on all six corners of the head shall be reasonably uniform, and the width across corners of the head shall be such that when a sharp ring having an inside diameter equal to the specified minimum width across corners is placed on the top of the head, the hex portion of the head shall protrude by an amount equal to or greater than the F value tabulated. See Mandatory Appendix II for across-corners gaging of hex heads. (7) Slot depth beyond the bottom of the indentation shall not be less than one-third of the minimum slot depth specified. 0.3200 0.3720 0.3750 0.4375 0.5000 20 24 3 ⁄8 7 ⁄16 1 ⁄2 Min. Width Across Flats, A [Note (5)] Max. --`,,```,,,,````-`-`,,`,,`,`,,`--- Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Nominal Size or Basic Screw Diameter [Note (4)] Table 32 ASME B18.6.3-2010 ASME B18.6.3-2010 Table 33 Recess Dimensions for Indented Hex Washer Head Screws Type I Shape of indentation optional P See Note (3) M See Note (2) A B Type VI H U L P M Type I Nominal Size or Basic Screw Diameter [Note (1)] Type VI Recess Penetration Gaging Depth, P Recess Penetration Gaging Depth, P [Note (4)] Recess Dia., M, Ref. Driver Size Max. Min. Recess Dia., M, Ref. Driver Size Max. Min. Fallaway 4 5 6 7 0.1120 0.1250 0.1380 0.1510 0.097 0.105 0.148 0.148 1 1 2 2 0.067 0.076 0.089 0.089 0.049 0.058 0.064 0.064 ... 0.111 0.132 0.132 ... T10 T15 T15 ... 0.050 0.055 0.055 ... 0.040 0.045 0.045 ... 0.022 0.026 0.026 8 10 12 14 1 ⁄4 0.1640 0.1900 0.2160 0.2420 0.2500 0.168 0.178 0.247 0.277 0.277 2 2 3 3 3 0.115 0.127 0.152 0.186 0.186 0.090 0.102 0.127 0.161 0.161 0.155 0.178 0.200 0.221 0.221 T20 T25 T27 T30 T30 0.070 0.075 0.085 0.100 0.100 0.055 0.060 0.070 0.085 0.085 0.031 0.036 0.040 0.044 0.044 0.3125 0.3200 0.3720 0.3750 0.358 0.358 0.386 0.386 4 4 4 4 0.234 0.234 0.267 0.267 0.219 0.219 0.243 0.243 0.266 0.266 0.312 0.312 T40 T40 T45 T45 0.120 0.120 0.145 0.145 0.105 0.105 0.130 0.130 0.047 0.047 0.055 0.055 5 ⁄16 20 24 3 ⁄8 GENERAL NOTES: (a) For additional requirements for machine screws, refer to sections 2 and 3, and for tapping screws refer to sections 2 and 4. (b) For head dimensions, refer to Table 32. (c) For recess inspection, see para. 2.1.3. NOTES: (1) Where specifying nominal size in decimals, zeros preceding the decimal and in the fourth decimal place shall be omitted. (2) Fillet radius, R, at the junction of the sides of the hex and the top of the washer shall not exceed 0.15 times the basic screw diameter. (3) A slight rounding of all edges and corners of the hex surfaces shall be permissible. (4) The recess depths and penetration given are intended to include the depth of the indentation. Due to possible variations in the indentation depths, there could be variations in these dimensions. In these cases, the requirements are to be as agreed upon between the manufacturer and the purchaser. --`,,```,,,,````-`-`,,`,,`,`,,`--- 56 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Not for Resale ASME B18.6.3-2010 Table 34 Recess Dimensions for Combination Slotted Type I Indented Hex Washer Head Screws Shape of indentation optional J P Gaging ring T See Note (3) F M See Note (2) A H Slot Width, J Slot Depth, T Recess Penetration Gaging Depth, P [Note (4)] Recess Dia., M, Ref. Driver Size Max. Min. Max. Min. Max. Min. 4 5 6 7 0.1120 0.1250 0.1380 0.1510 0.097 0.105 0.148 0.148 1 1 2 2 0.039 0.043 0.048 0.048 0.031 0.035 0.039 0.039 0.042 0.049 0.053 0.053 0.024 0.028 0.030 0.030 0.067 0.076 0.089 0.089 0.049 0.058 0.064 0.064 8 10 12 14 0.1640 0.1900 0.2160 0.2420 0.168 0.178 0.247 0.277 2 2 3 3 0.054 0.060 0.067 0.075 0.045 0.050 0.056 0.064 0.074 0.080 0.103 0.111 0.048 0.052 0.072 0.078 0.115 0.127 0.152 0.186 0.090 0.102 0.127 0.161 1 ⁄4 0.2500 ⁄16 0.3125 3 ⁄8 0.3750 0.277 0.358 0.386 3 4 4 0.075 0.084 0.094 0.064 0.072 0.081 0.111 0.134 0.168 0.078 0.100 0.161 0.186 0.234 0.267 0.161 0.210 0.243 5 GENERAL NOTES: (a) For additional requirements for machine screws, refer to sections 2 and 3, and for tapping screws refer to sections 2 and 4. (b) The specified minimum slot depths are approximately 10% lower than those for slotted hex washer heads. That portion of the slot depth that penetrates beyond the bottom of the indentation shall not be less than one-third of the minimum slot depth specified. (c) For head dimensions, refer to Table 32. (d) For recess inspection, see para. 2.1.3. NOTES: (1) Where specifying nominal size in decimals, zeros preceding the decimal and in the fourth decimal place shall be omitted. (2) Fillet radius, R, at the junction of the sides of the hex and the top of the washer shall not exceed 0.15 times the basic screw diameter. (3) A slight rounding of all edges and corners of the hex surfaces shall be permissible. (4) The recess depths, slot depths, and penetration given are intended to include the depth of the indentation. Due to possible variations in the indentation depths, there could be variations in these dimensions. In these cases, the requirements are to be as agreed upon between the manufacturer and the purchaser. 57 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Not for Resale --`,,```,,,,````-`-`,,`,,`,`,,`--- B Nominal Size or Basic Screw Diameter [Note (1)] L U ASME B18.6.3-2010 Table 35 Dimensions of Slotted Round Head Screws Nominal Size or Basic Screw Diameter [Notes (1)–(3)] Max. Min. Max. Min. Max. Min. Max. Min. 0000 0.0210 000 0.0340 00 0.0470 0.041 0.062 0.089 0.035 0.056 0.080 0.022 0.031 0.045 0.016 0.025 0.036 0.008 0.012 0.017 0.004 0.008 0.010 0.017 0.018 0.026 0.013 0.012 0.018 Head Diameter, A Head Height, H Slot Width, J Slot Depth, T 0 1 2 3 0.0600 0.0730 0.0860 0.0990 0.113 0.138 0.162 0.187 0.099 0.122 0.146 0.169 0.053 0.061 0.069 0.078 0.043 0.051 0.059 0.067 0.023 0.026 0.031 0.035 0.016 0.019 0.023 0.027 0.039 0.044 0.048 0.053 0.029 0.033 0.037 0.040 4 5 6 7 0.1120 0.1250 0.1380 0.1510 0.211 0.236 0.260 0.285 0.193 0.217 0.240 0.264 0.086 0.095 0.103 0.111 0.075 0.083 0.091 0.099 0.039 0.043 0.048 0.048 0.031 0.035 0.039 0.039 0.058 0.063 0.068 0.072 0.044 0.047 0.051 0.055 8 10 12 14 0.1640 0.1900 0.2160 0.2420 0.309 0.359 0.408 0.457 0.287 0.334 0.382 0.429 0.120 0.137 0.153 0.170 0.107 0.123 0.139 0.155 0.054 0.060 0.067 0.075 0.045 0.050 0.056 0.064 0.077 0.087 0.096 0.106 0.058 0.065 0.073 0.080 1 ⁄4 16 18 5 ⁄16 0.2500 0.2680 0.2940 0.3125 0.472 0.506 0.555 0.590 0.443 0.476 0.523 0.557 0.175 0.187 0.204 0.216 0.160 0.171 0.187 0.198 0.075 0.075 0.084 0.084 0.064 0.064 0.072 0.072 0.109 0.115 0.125 0.132 0.082 0.087 0.094 0.099 20 24 3 ⁄8 7 ⁄16 0.3200 0.3720 0.3750 0.4375 0.604 0.702 0.708 0.750 0.570 0.664 0.670 0.707 0.220 0.254 0.256 0.328 0.203 0.235 0.237 0.307 0.084 0.094 0.094 0.094 0.072 0.081 0.081 0.081 0.134 0.154 0.155 0.196 0.101 0.116 0.117 0.148 1 ⁄2 ⁄16 5 ⁄8 3 ⁄4 0.5000 0.5625 0.6250 0.7500 0.813 0.938 1.000 1.250 0.766 0.887 0.944 1.185 0.355 0.410 0.438 0.547 0.332 0.385 0.411 0.516 0.106 0.118 0.133 0.149 0.091 0.102 0.116 0.131 0.211 0.242 0.258 0.320 0.159 0.183 0.195 0.242 9 --`,,```,,,,````-`-`,,`,,`,`,,`--- GENERAL NOTES: (a) For additional requirements for machine screws, refer to sections 2 and 3, and for tapping screws refer to sections 2 and 4. (b) Use of round head screws is not recommended; use pan head screws. See para. 2.2.11 and Tables 17 through 20. (c) For recess dimensions, refer to Table 36. (d) Applicable to screw types as indicated below. See referenced tables for thread and point dimensions and minimum practical screw lengths. (1) Type A thread forming, except short lengths, see Table 42. (2) Type B and BP thread forming, see Table 41; and Types BF and BT thread cutting, see Table 43. (3) Type C thread forming, see Mandatory Appendix VI; Types D, F, G, and T thread cutting, see Table 44; and Type TRS thread-rolling, see Table 45. (e) For slot inspection, see para. 2.1.4. NOTES: (1) Where specifying nominal size in decimals, zeros preceding the decimal and in the fourth decimal place shall be omitted. (2) Sizes 0000, 000, 00, 9⁄16, 5⁄8, and 3⁄4 are for machine screws only. (3) Sizes 7, 14, 16, 18, 20, and 24 are for tapping screws only. 58 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Not for Resale ASME B18.6.3-2010 Table 36 Recess Dimensions for Round Head Screws Type IA P M M Type I Nominal Size or Basic Screw Diameter [Notes (1)–(3)] Type III P Recess Dia., M, Ref. Driver Size M Type IA Recess Penetration Gaging Depth, P Max. Min. Recess Dia., M, Ref. P Driver Size Type III Recess Penetration Gaging Depth, P Max. Min. Recess Across Flats, M, Ref. Recess Penetration Gaging Depth, P [Note (5)] Driver Size (4) Max. Min. 0 1 2 3 0.0600 0.0730 0.0860 0.0990 0.066 0.075 0.093 0.102 0 0 1 1 0.035 0.045 0.046 0.055 0.015 0.026 0.027 0.035 ... ... 0.092 ... ... ... 1 ... ... ... 0.047 ... ... ... 0.031 ... ... ... 0.050 0.070 ... ... 00 0 ... ... 0.033 0.038 ... ... 0.028 0.028 4 5 6 7 0.1120 0.1250 0.1380 0.1510 0.111 0.147 0.155 0.164 1 2 2 2 0.065 0.063 0.073 0.081 0.046 0.035 0.045 0.055 0.110 0.142 0.150 ... 1 2 2 ... 0.067 0.063 0.071 ... 0.051 0.045 0.053 ... 0.070 0.070 0.091 0.091 0 0 1R 1R 0.038 0.038 0.065 0.065 0.028 0.028 0.050 0.050 8 10 12 14 0.1640 0.1900 0.2160 0.2420 0.171 0.188 0.242 0.258 2 2 3 3 0.090 0.108 0.108 0.125 0.064 0.082 0.082 0.099 0.164 0.182 0.234 ... 2 2 3 ... 0.086 0.105 0.103 ... 0.068 0.087 0.085 ... 0.091 0.112 0.112 0.133 1R 2R 2R 3R 0.065 0.075 0.075 0.095 0.050 0.060 0.060 0.080 1 ⁄4 16 18 5 ⁄16 0.2500 0.2680 0.2940 0.3125 0.261 0.274 0.322 0.301 3 3 4 3 0.130 0.142 0.147 0.170 0.104 0.119 0.121 0.144 0.255 ... ... 0.291 3 ... ... 3 0.126 ... ... 0.162 0.108 ... ... 0.144 0.133 0.133 0.133 0.133 3R 3R 3R 3R 0.095 0.095 0.095 0.095 0.080 0.080 0.080 0.080 20 24 3 ⁄8 7 ⁄16 0.3200 0.3720 0.3750 0.4375 0.338 0.380 0.380 0.395 4 4 4 4 0.163 0.208 0.208 0.221 0.137 0.182 0.182 0.196 ... ... 0.368 ... ... ... 4 ... ... ... 0.195 ... ... ... 0.177 ... 0.191 0.191 0.191 0.191 4R 4R 4R 4R 0.100 0.100 0.100 0.100 0.085 0.085 0.085 0.085 1 ⁄2 ⁄16 5 ⁄8 3 ⁄4 0.5000 0.5625 0.6250 0.7500 0.409 0.447 0.542 0.642 4 4 5 5 0.236 0.272 0.285 0.385 0.211 0.245 0.244 0.346 ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... 9 ... ... ... ... GENERAL NOTES: (a) For additional requirements for machine screws, refer to sections 2 and 3, and for tapping screws refer to sections 2 and 4. (b) Use of round head screws is not recommended; use pan head screws. See para. 2.2.11 and Tables 17 through 20. (c) For head dimensions, refer to Table 35. (d) For recess inspection, see para. 2.1.3. NOTES: (1) Where specifying nominal size in decimals, zeros preceding the decimal and in the fourth decimal place shall be omitted. (2) Sizes 9⁄16, 5⁄8, and 3⁄4 are for machine screws only. (3) Sizes 7, 14, 16, 18, 20, and 24 are for tapping screws only. (4) “R” in the recess size tabulation means regular depth recess. (5) Square recesses incorporate a slight taper on the sides of the recess. This taper can result in loss of penetration gaging depth on finished fasteners due to the buildup of plating in the recesses. The recess penetration dimensions specified here are for finished (plated) product. Manufacturers should be advised that they should not use all this tolerance in the heading process, or an out-of-tolerance condition could exist after plating. 59 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Not for Resale --`,,```,,,,````-`-`,,`,,`,`,,`--- Type I --`,,```,,,,````-`-`,,`,,`,`,,`--- Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS 0.023 0.026 0.031 0.035 0.039 0.043 0.048 0.048 0.054 0.060 0.067 0.075 0.075 0.075 0.084 0.084 0.084 0.094 0.094 0.094 0.1120 0.1250 0.1380 0.1510 4 5 6 7 8 0.1640 10 0.1900 12 0.2160 14 0.2420 1 ⁄4 0.2500 16 0.2680 18 0.2940 5 ⁄16 0.3125 20 0.3200 24 0.3720 3 ⁄8 0.3750 7 ⁄16 0.4375 Max. 60 Not for Resale 0.072 0.081 0.081 0.081 0.064 0.064 0.072 0.072 0.045 0.050 0.056 0.064 0.031 0.035 0.039 0.039 0.016 0.019 0.023 0.027 Min. Slot Width, J 0 0.0600 1 0.0730 2 0.0860 3 0.0990 Nominal Size or Basic Screw Diameter [Notes (1), (2), (3)] J M Type I 0.134 0.154 0.155 0.196 0.109 0.115 0.125 0.132 0.077 0.087 0.096 0.106 0.058 0.063 0.068 0.072 0.039 0.044 0.048 0.053 Max. 0.101 0.116 0.117 0.148 0.082 0.087 0.094 0.099 0.058 0.065 0.073 0.080 0.044 0.047 0.051 0.055 0.029 0.033 0.037 0.040 Min. P 0.338 0.380 0.380 0.395 0.261 0.274 0.322 0.301 0.171 0.188 0.242 0.258 0.111 0.147 0.155 0.164 0.066 0.075 0.093 0.102 Recess Dia., M, Ref. T 4 4 4 4 3 3 4 3 2 2 3 3 1 2 2 2 0 0 1 1 Driver Size Type I J 0.163 0.208 0.208 0.221 0.130 0.142 0.147 0.170 0.090 0.108 0.108 0.125 0.065 0.063 0.073 0.081 0.035 0.045 0.046 0.055 Max. 0.137 0.182 0.182 0.196 0.104 0.119 0.121 0.144 0.064 0.082 0.082 0.099 0.046 0.035 0.045 0.055 0.015 0.026 0.027 0.035 Min. Recess Penetration Gaging Depth, P M Type IA T ... ... 0.368 ... 0.255 ... ... 0.291 0.164 0.182 0.234 ... 0.110 0.142 0.150 ... ... ... 0.092 ... Recess Dia., M, Ref. P Recess Dimensions for Combination Slotted Round Head Screws Slot Depth, T Table 37 ... ... 4 ... 3 ... ... 3 2 2 3 ... 1 2 2 ... ... ... 1 ... Driver Size Type IA ... ... 0.195 ... 0.126 ... ... 0.162 0.086 0.105 0.103 ... 0.067 0.063 0.071 ... ... ... 0.047 ... Max. ... ... 0.177 ... 0.108 ... ... 0.144 0.068 0.087 0.085 ... 0.051 0.045 0.053 ... ... ... 0.031 ... Min. Recess Penetration Gaging Depth, P ASME B18.6.3-2010 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS 0.106 0.118 0.133 0.149 Max. 0.091 0.102 0.116 0.131 Min. Slot Width, J 0.211 0.242 0.258 0.320 Max. 0.159 0.183 0.195 0.242 Min. Slot Depth, T 0.409 0.447 0.542 0.642 Recess Dia., M, Ref. 4 4 5 5 Driver Size Type I 0.236 0.272 0.285 0.385 Max. 0.211 0.245 0.244 0.346 Min. Recess Penetration Gaging Depth, P ... ... ... ... Recess Dia., M, Ref. Recess Dimensions for Combination Slotted Round Head Screws (Cont’d) ... ... ... ... Driver Size Type IA GENERAL NOTES: (a) For additional requirements for machine screws, refer to sections 2 and 3, and for tapping screws refer to sections 2 and 4. (b) Use of round head screws is not recommended; use pan head screws. See para. 2.2.11 and Tables 17 through 20. (c) For head dimensions, refer to Table 35. (d) Due to the underfill of material caused by the combination recess, the minimum slot depths are approximately 10% lower than those for slotted round heads. (e) For recess inspection, see para. 2.1.3. NOTES: (1) Where specifying nominal size in decimals, zeros preceding the decimal and in the fourth decimal place shall be omitted. (2) Sizes 9⁄16, 5⁄8, and 3⁄4 are for machine screws only. (3) Sizes 7, 14, 16, 18, 20, and 24 are for tapping screws only. 9 ⁄2 0.5000 ⁄16 0.5625 5 ⁄8 0.6250 3 ⁄4 0.7500 1 Nominal Size or Basic Screw Diameter [Notes (1), (2), (3)] Table 37 ... ... ... ... Max. ... ... ... ... Min. Recess Penetration Gaging Depth, P ASME B18.6.3-2010 --`,,```,,,,````-`-`,,`,,`,`,,`--- 61 Not for Resale ASME B18.6.3-2010 Table 38 Dimensions of Slotted Round Washer Head Screws A T B J U --`,,```,,,,````-`-`,,`,,`,`,,`--- H Nominal Size or Basic Screw Diameter [Note (1)] Washer Diameter, B Head Height, H Crown Diameter, A, Ref. Max. Min. Max. Slot Width, J Slot Depth, T Min. Washer Thickness, U, Ref. Max. Min. Max. Min. 2 3 4 5 0.0860 0.0990 0.1120 0.1250 0.136 0.156 0.177 0.198 0.202 0.232 0.261 0.291 0.186 0.215 0.243 0.272 0.062 0.070 0.079 0.088 0.050 0.058 0.067 0.075 0.030 0.030 0.030 0.040 0.031 0.035 0.039 0.043 0.023 0.027 0.031 0.035 0.037 0.042 0.048 0.053 0.030 0.034 0.038 0.041 6 7 8 10 12 0.1380 0.1510 0.1640 0.1900 0.2160 0.218 0.238 0.259 0.300 0.341 0.321 0.350 0.380 0.439 0.498 0.301 0.330 0.358 0.416 0.473 0.096 0.105 0.113 0.130 0.148 0.084 0.092 0.101 0.118 0.134 0.040 0.040 0.040 0.050 0.050 0.048 0.048 0.054 0.060 0.067 0.039 0.039 0.045 0.050 0.056 0.058 0.060 0.067 0.071 0.085 0.043 0.045 0.051 0.055 0.067 14 1 ⁄4 16 18 5 ⁄16 0.2420 0.2500 0.2680 0.2940 0.3125 0.382 0.396 0.423 0.661 0.494 0.558 0.576 0.617 0.676 0.719 0.531 0.548 0.588 0.646 0.687 0.165 0.170 0.182 0.199 0.211 0.151 0.157 0.168 0.185 0.197 0.050 0.050 0.060 0.060 0.060 0.075 0.075 0.075 0.084 0.084 0.064 0.064 0.064 0.072 0.072 0.095 0.098 0.105 0.113 0.118 0.080 0.083 0.088 0.094 0.100 20 24 3 ⁄8 7 ⁄16 1 ⁄2 0.3200 0.3720 0.3750 0.4375 0.5000 0.505 0.587 0.593 0.691 0.790 0.736 0.854 0.861 1.004 1.146 0.703 0.818 0.825 0.963 1.101 0.216 0.251 0.253 0.294 0.335 0.202 0.236 0.238 0.278 0.319 0.060 0.060 0.060 0.070 0.090 0.084 0.094 0.094 0.094 0.106 0.072 0.081 0.081 0.081 0.091 0.125 0.137 0.139 0.165 0.180 0.115 0.115 0.117 0.140 0.155 GENERAL NOTES: (a) For additional requirements, for machine screws, refer to sections 2 and 3; and for tapping screws, refer to sections 2 and 4. (b) For slot inspection, see para. 2.1.4. NOTE: (1) Where specifying nominal size in decimals, zeros preceding the decimal and in the fourth decimal place shall be omitted. 62 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Not for Resale Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS 63 Not for Resale 0.218 0.238 0.259 0.300 0.341 0.382 0.396 0.423 0.661 0.494 6 0.1380 7 0.1510 8 0.1640 10 0.1900 12 0.2160 0.2420 0.2500 0.2680 0.2940 0.3125 0.3200 0.3720 0.3750 0.4375 0.5000 14 1 ⁄4 16 18 5 ⁄16 20 24 3 ⁄8 7 ⁄16 1 ⁄2 0.216 0.251 0.253 0.294 0.335 0.165 0.170 0.182 0.199 0.211 0.096 0.105 0.113 0.130 0.148 0.062 0.070 0.079 0.088 Max. 0.202 0.236 0.238 0.278 0.319 0.151 0.157 0.168 0.185 0.197 0.084 0.092 0.101 0.118 0.134 0.050 0.058 0.067 0.075 Min. Head Height, H 0.736 0.854 0.861 1.004 1.146 0.558 0.576 0.617 0.676 0.719 0.321 0.350 0.380 0.439 0.498 0.202 0.232 0.261 0.291 Max. 0.703 0.818 0.825 0.963 1.101 0.531 0.548 0.588 0.646 0.687 0.301 0.330 0.358 0.416 0.473 0.186 0.215 0.243 0.272 Min. Washer Diameter, B 0.060 0.060 0.060 0.070 0.090 0.050 0.050 0.060 0.060 0.060 0.040 0.040 0.040 0.050 0.050 0.030 0.030 0.030 0.040 Washer Thickness, U, Ref. 0.325 0.347 0.348 0.366 0.383 0.241 0.244 0.261 0.279 0.292 0.147 0.150 0.161 0.177 0.228 0.099 0.107 0.116 0.139 Recess Dia., M, Ref. 4 4 4 4 4 3 3 3 3 3 2 2 2 2 3 1 1 1 2 Driver Size Type I M 0.145 0.170 0.170 0.190 0.210 0.105 0.107 0.126 0.144 0.156 0.061 0.065 0.076 0.093 0.094 0.046 0.056 0.065 0.054 Max. 0.118 0.144 0.144 0.165 0.184 0.077 0.080 0.096 0.118 0.129 0.033 0.037 0.048 0.066 0.066 0.021 0.033 0.044 0.026 Min. Recess Penetration Gaging Depth, P Type VI --`,,```,,,,````-`-`,,`,,`,`,,`--- GENERAL NOTES: (a) For additional requirements, for machine screws, refer to sections 2 and 3; and for tapping screws, refer to sections 2 and 4. (b) For recess inspection, see para. 2.1.3. NOTE: (1) Where specifying nominal size in decimals, zeros preceding the decimal and in the fourth decimal place shall be omitted. 0.505 0.587 0.593 0.691 0.790 0.136 0.156 0.177 0.198 Crown Diameter, A, Ref. 0.0860 0.0990 0.1120 0.1250 2 3 4 5 Nominal Size or Basic Screw Diameter [Note (1)] M P P 0.266 0.312 0.312 0.352 0.446 0.221 0.221 0.221 0.266 0.266 0.132 0.132 0.155 0.178 0.200 0.081 0.094 0.111 0.111 Recess Dia., M, Ref. Recess Dimensions for Round Washer Head Screws Type I Table 39 T40 T45 T45 T50 T55 T30 T30 T30 T40 T40 T15 T15 T20 T25 T27 T7 T8 T9 T10 Driver Size 0.125 0.125 0.130 0.150 0.170 0.085 0.090 0.105 0.105 0.120 0.060 0.070 0.065 0.075 0.080 0.035 0.035 0.040 0.045 Max. 0.110 0.110 0.115 0.135 0.155 0.070 0.075 0.090 0.090 0.105 0.050 0.060 0.050 0.060 0.065 0.030 0.030 0.035 0.035 Min. Recess Penetration Gaging Depth, P Type VI 0.047 0.055 0.055 0.062 0.078 0.044 0.044 0.044 0.047 0.047 0.026 0.026 0.031 0.036 0.040 0.019 0.019 0.022 0.022 Max. Fallaway ASME B18.6.3-2010 ASME B18.6.3-2010 Table 40 Dimensions of Threads and Points for Types AB and ABR [Note (1)] Thread-Forming Tapping Screws Flat width [Note (2)] d L Detail of thread form Nominal Size [Note (3)] or Basic Screw Diameter Minimum Practical Nominal Screw Lengths, L Major Diameter, D Minor Diameter, d Threads per inch Max. Min. Max. Min. 1 5 3 0.082 0.090 0.099 0.109 7 ⁄32 1 ⁄4 9 ⁄32 5 ⁄16 9 ⁄32 ⁄16 11 ⁄32 3 ⁄8 0.122 0.141 0.164 0.116 0.135 0.157 5 ⁄16 3 ⁄8 7 ⁄16 ⁄8 ⁄16 21 ⁄32 0.192 0.244 0.309 0.359 0.423 0.185 0.236 0.299 0.349 0.413 1 19 0.0600 0.0730 0.0860 0.0990 48 42 32 28 0.060 0.075 0.088 0.101 0.054 0.069 0.082 0.095 0.036 0.049 0.064 0.075 0.033 0.046 0.060 0.071 4 5 6 7 0.1120 0.1250 0.1380 0.1510 24 20 20 19 0.114 0.130 0.139 0.154 0.108 0.123 0.132 0.147 0.086 0.094 0.104 0.115 8 10 12 0.1640 0.1900 0.2160 18 16 14 0.166 0.189 0.215 0.159 0.182 0.208 1 0.2500 0.3125 0.3750 0.4375 0.5000 14 12 12 10 10 0.246 0.315 0.380 0.440 0.504 0.237 0.306 0.371 0.429 0.493 ⁄4 ⁄16 3 ⁄8 7 ⁄16 1 ⁄2 Csk. Heads 5 0 1 2 3 5 90-deg Heads ⁄8 ⁄32 3 ⁄16 3 ⁄16 ⁄2 ⁄8 3 ⁄4 7 ⁄8 1 5 ⁄32 ⁄16 7 ⁄32 1 ⁄4 5 3 7 ⁄32 ⁄4 29 ⁄32 11⁄32 15⁄32 3 GENERAL NOTES: (a) For additional requirements, refer to section 2. (b) Sizes shown in boldface type are preferred. (c) For determining the effective grip length of Type AB screws, see Nonmandatory Appendix B. NOTES: (1) Point: (a) No extrusion of excess metal beyond the apex of the point resulting from thread rolling shall be permissible. A slight rounding or truncation of the point is desirable. (b) If a nonsharp point is specifically required, designate the screws as “ABR.” The reference point radius is 15% of the D dimension. (2) The width of flat at crest of thread shall not exceed 0.004 in. for sizes up to and including No. 8, and 0.006 in. for larger sizes. (3) Where specifying nominal size in decimals, zeros preceding the decimal and in the fourth decimal place shall be omitted. 64 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Not for Resale --`,,```,,,,````-`-`,,`,,`,`,,`--- D Slight radius permissible ASME B18.6.3-2010 Minimum Practical Nominal Screw Lengths, L Nominal Size [Note (3)] or Basic Screw Diameter Major Diameter, D Minor Diameter, d Point Diameter, P Point Taper Length, S Threads per Inch Max. Min. Max. Min. Ref. Max. Min. Type B 90-deg Heads 1 Type BP Csk. Heads 1 ⁄8 ⁄32 3 ⁄16 7 ⁄32 5 ⁄32 ⁄16 1 ⁄4 9 ⁄32 3 3 7 1 ⁄4 ⁄32 9 ⁄32 5 ⁄16 5 ⁄16 11 ⁄32 3 ⁄8 13 ⁄32 11 9 11 7 5 3 ⁄2 ⁄32 21 ⁄32 0.0600 0.0730 0.0860 0.0990 48 42 32 28 0.060 0.075 0.088 0.101 0.054 0.069 0.082 0.095 0.036 0.049 0.064 0.075 0.033 0.046 0.060 0.071 0.031 0.044 0.058 0.068 0.042 0.048 0.062 0.071 0.031 0.036 0.047 0.054 ⁄8 ⁄8 5 ⁄32 3 ⁄16 4 5 6 7 0.1120 0.1250 0.1380 0.1510 24 20 20 19 0.114 0.130 0.139 0.154 0.108 0.123 0.132 0.147 0.086 0.094 0.104 0.115 0.082 0.090 0.099 0.109 0.079 0.087 0.095 0.105 0.083 0.100 0.100 0.105 0.063 0.075 0.075 0.079 3 7 9 8 10 12 0.1640 0.1900 0.2160 18 16 14 0.166 0.189 0.215 0.159 0.182 0.208 0.122 0.141 0.164 0.116 0.135 0.157 0.112 0.130 0.152 0.111 0.125 0.143 0.083 0.094 0.107 1 0.2500 0.3125 0.3750 0.4375 0.5000 14 12 12 10 10 0.246 0.315 0.380 0.440 0.504 0.237 0.306 0.371 0.429 0.493 0.192 0.244 0.309 0.359 0.423 0.185 0.236 0.299 0.349 0.413 0.179 0.230 0.293 0.343 0.407 0.143 0.167 0.167 0.200 0.200 0.107 0.125 0.125 0.150 0.150 ⁄4 ⁄16 3 ⁄8 7 ⁄16 1 ⁄2 1 ⁄16 ⁄32 1 ⁄4 1 ⁄4 ⁄32 ⁄16 11 ⁄32 3 ⁄8 ⁄32 17 ⁄32 5 ⁄8 11 ⁄16 15 ⁄32 ⁄8 7 ⁄16 1 ⁄2 ⁄32 11 ⁄16 25 ⁄32 27 ⁄32 19 ⁄16 1 ⁄2 9 ⁄16 21 ⁄32 ⁄32 15 ⁄16 11⁄8 11⁄4 27 GENERAL NOTES: (a) For additional requirements, refer to section 2. (b) For determining the effective grip length of BP screws, see Nonmandatory Appendix B. NOTES: (1) Threads within point taper length shall have unfinished crests. (2) The width of flat at crest of thread shall not exceed 0.004 in. for sizes up to and including No. 8, and 0.006 in. for larger sizes. (3) Where specifying nominal size in decimals, zeros preceding the decimal and in the fourth decimal place shall be omitted. 65 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Not for Resale Csk. Heads 5 0 1 2 3 5 90-deg Heads ⁄16 ⁄32 9 ⁄32 5 ⁄16 ⁄32 ⁄32 7 ⁄16 15 ⁄32 13 1 19 3 ⁄4 ⁄32 11⁄8 11⁄4 113⁄32 31 --`,,```,,,,````-`-`,,`,,`,`,,`--- Table 41 Dimensions of Threads and Points for Types B and BP Thread-Forming Tapping Screws ASME B18.6.3-2010 Table 42 Dimensions of Threads and Points for Type A Thread-Forming Tapping Screws Nominal Size [Note (3)] or Basic Screw Diameter For These Lengths or Shorter, Use Type AB, L [Note (4)] Major Diameter, D Minor Diameter, d Threads per in. Max. Min. Max. Min. 90-deg Heads Csk. Heads 1 3 1 3 0.078 0.090 0.096 0.108 3 ⁄16 ⁄16 1 ⁄4 5 ⁄16 1 ⁄4 ⁄4 5 ⁄16 3 ⁄8 0.123 0.133 0.162 0.116 0.126 0.155 3 ⁄8 ⁄8 7 ⁄16 7 0.185 0.197 0.217 0.234 0.291 0.178 0.189 0.209 0.226 0.282 1 ⁄2 ⁄16 5 ⁄8 11 ⁄16 3 ⁄4 5 0 1 2 3 0.0600 0.0730 0.0860 0.0990 40 32 32 28 0.060 0.075 0.088 0.101 0.057 0.072 0.084 0.097 0.042 0.051 0.061 0.076 0.039 0.048 0.056 0.071 ⁄8 ⁄8 5 ⁄32 3 ⁄16 4 5 6 7 0.1120 0.1250 0.1380 0.1510 24 20 18 16 0.114 0.130 0.141 0.158 0.110 0.126 0.136 0.152 0.083 0.095 0.102 0.114 8 10 12 0.1640 0.1900 0.2160 15 12 11 0.168 0.194 0.221 0.162 0.188 0.215 14 16 18 20 24 0.2420 0.2680 0.2940 0.3200 0.3720 10 10 9 9 9 0.254 0.280 0.306 0.333 0.390 0.248 0.274 0.300 0.327 0.383 3 3 9 ⁄16 ⁄16 3 ⁄16 7 ⁄32 1 ⁄16 1 ⁄2 9 ⁄16 ⁄8 ⁄4 13 ⁄16 113⁄16 1 3 GENERAL NOTES: (a) For additional requirements, refer to section 2. (b) Sizes shown in boldface type are preferred. (c) For determining the effective grip length of Type AB screws, see Nonmandatory Appendix B. NOTES: (1) No extrusion of excess metal beyond the apex of the point resulting from thread rolling shall be permissible. A slight rounding or truncation of the point is desirable. (2) The width of flat at crest of thread shall not exceed 0.004 in. for sizes up to and including No. 8, and 0.006 in. for larger sizes. (3) Where specifying nominal size in decimals, zeros preceding the decimal and in the fourth decimal place shall be omitted. (4) For screws in these nominal lengths and shorter, use Type AB screws specified in Table 40. 66 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS --`,,```,,,,````-`-`,,`,,`,`,,`--- Not for Resale ASME B18.6.3-2010 Nominal Size [Note (3)] or Basic Screw Diameter Major Diameter, D Minor Diameter, d Point Diameter, P Point Taper Length, S Threads per Inch Max. Min. Max. Min. Ref. Max. Min. Minimum Practical Nominal Screw Lengths, L 90-deg Heads 1 Csk. Heads 1 0 1 2 3 0.0600 0.0730 0.0860 0.0990 48 42 32 28 0.060 0.075 0.088 0.101 0.054 0.069 0.082 0.095 0.036 0.049 0.064 0.075 0.033 0.046 0.060 0.071 0.031 0.044 0.058 0.068 0.042 0.048 0.062 0.071 0.031 0.036 0.047 0.054 ⁄8 ⁄8 5 ⁄32 3 ⁄16 ⁄8 ⁄32 3 ⁄16 7 ⁄32 4 5 6 7 0.1120 0.1250 0.1380 0.1510 24 20 20 19 0.114 0.130 0.139 0.154 0.108 0.123 0.132 0.147 0.086 0.094 0.104 0.115 0.082 0.090 0.099 0.109 0.079 0.087 0.095 0.105 0.083 0.100 0.100 0.105 0.063 0.075 0.075 0.079 3 ⁄16 ⁄32 1 ⁄4 1 ⁄4 ⁄4 ⁄32 9 ⁄32 5 ⁄16 8 10 12 0.1640 0.1900 0.2160 18 16 14 0.166 0.189 0.215 0.159 0.182 0.208 0.122 0.141 0.164 0.116 0.135 0.157 0.112 0.130 0.152 0.111 0.125 0.143 0.083 0.094 0.107 9 11 5 3 1 0.2500 0.3125 0.3750 0.4375 0.5000 14 12 12 10 10 0.246 0.315 0.380 0.440 0.504 0.237 0.306 0.371 0.429 0.493 0.192 0.244 0.309 0.359 0.423 0.185 0.236 0.299 0.349 0.413 0.179 0.230 0.293 0.343 0.407 0.143 0.167 0.167 0.200 0.200 0.107 0.125 0.125 0.150 0.150 ⁄4 ⁄16 3 ⁄8 7 ⁄16 1 ⁄2 5 1 7 ⁄32 ⁄16 11 ⁄32 3 ⁄8 ⁄32 17 ⁄32 5 ⁄8 11 ⁄16 15 5 1 9 ⁄32 ⁄8 7 ⁄16 1 ⁄2 ⁄32 11 ⁄16 25 ⁄32 27 ⁄32 19 GENERAL NOTE: For additional requirements, refer to section 2. NOTES: (1) Points of screws shall be tapered and fluted or slotted as illustrated above for the respective types. The flute on Type BT screws shall have an included angle of 90 deg to 95 deg and the thread cutting edge located above the axis of screw. Tapered threads shall have unfinished crests, and the flutes or slots shall extend through first full form thread beyond taper except for Type BF screws on which tapered threads may be complete at manufacturer’s option and flutes may be one pitch short of first full form thread. Other details of taper and flute design shall be optional with the manufacturer provided the screws meet the specified performance requirements. (2) The width of flat at crest of thread shall not exceed 0.004 in. for sizes up to and including No. 8, and 0.006 in. for larger sizes. (3) Where specifying nominal size in decimals, zeros preceding the decimal and in the fourth decimal place shall be omitted. 67 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Not for Resale --`,,```,,,,````-`-`,,`,,`,`,,`--- Table 43 Dimensions of Threads and Points for Types BF and BT Thread-Cutting Tapping Screws ASME B18.6.3-2010 Table 44 Dimensions of Threads and Points for Types D, F, G, and T Thread-Cutting Tapping Screws Nominal Size [Note (2)] or Basic Screw Diameter Threads per Inch Major Diameter, D Point Diameter, P Point Taper Length, S [Note (3)] For Short Screws For Long Screws Max. Min. Ref. Max. Min. Max. Min. Determinant Lengths for Point Taper, L [Note (3)] Minimum Practical Nominal Screw Lengths, L 90-deg Heads 90-deg Heads Csk. Heads 5 3 5 3 ⁄32 ⁄8 5 ⁄32 5 ⁄32 3 1 1 5 3 ⁄16 ⁄32 3 ⁄16 3 ⁄16 1 ⁄4 3 ⁄16 1 5 7 1 5 2 2 3 3 0.0860 0.0860 0.0990 0.0990 56 64 48 56 0.0860 0.0860 0.0990 0.0990 0.0813 0.0816 0.0938 0.0942 0.068 0.070 0.078 0.081 0.062 0.055 0.073 0.062 0.045 0.039 0.052 0.045 0.080 0.070 0.094 0.080 0.062 0.055 0.073 0.062 ⁄32 ⁄8 3 ⁄16 5 ⁄32 4 4 5 5 6 6 0.1120 0.1120 0.1250 0.1250 0.1380 0.1380 40 48 40 44 32 40 0.1120 0.1120 0.1250 0.1250 0.1380 0.1380 0.1061 0.1068 0.1191 0.1195 0.1312 0.1321 0.087 0.091 0.100 0.102 0.107 0.113 0.088 0.073 0.088 0.080 0.109 0.088 0.062 0.052 0.062 0.057 0.078 0.062 0.112 0.094 0.112 0.102 0.141 0.112 0.088 0.073 0.088 0.080 0.109 0.088 7 3 7 8 8 10 10 12 12 0.1640 0.1640 0.1900 0.1900 0.2160 0.2160 32 36 24 32 24 28 0.1640 0.1640 0.1900 0.1900 0.2160 0.2160 0.1571 0.1577 0.1818 0.1831 0.2078 0.2085 0.132 0.136 0.148 0.158 0.174 0.180 0.109 0.097 0.146 0.109 0.146 0.125 0.078 0.069 0.104 0.078 0.104 0.089 0.141 0.125 0.188 0.141 0.188 0.161 0.109 0.097 0.146 0.109 0.146 0.125 1 ⁄4 ⁄32 11 ⁄32 1 ⁄4 11 ⁄32 5 ⁄16 11 ⁄32 ⁄16 7 ⁄16 11 ⁄32 7 ⁄16 13 ⁄32 ⁄4 ⁄32 5 ⁄16 1 ⁄4 5 ⁄16 9 ⁄32 1 ⁄4 ⁄4 5 ⁄16 5 ⁄16 3 ⁄8 3 ⁄8 0.2500 0.2500 0.3125 0.3125 0.3750 0.3750 20 28 18 24 16 24 0.2500 0.2500 0.3125 0.3125 0.3750 0.3750 0.2408 0.2425 0.3026 0.3042 0.3643 0.3667 0.200 0.214 0.257 0.271 0.312 0.333 0.175 0.125 0.194 0.146 0.219 0.146 0.125 0.089 0.139 0.104 0.156 0.104 0.225 0.161 0.250 0.188 0.281 0.188 0.175 0.125 0.194 0.146 0.219 0.146 13 17 ⁄32 ⁄32 19 ⁄32 15 ⁄32 11 ⁄16 1 ⁄2 3 7 0.4375 0.4375 0.5000 0.5000 14 20 13 20 0.4375 0.4375 0.5000 0.5000 0.4258 0.4281 0.4876 0.4906 0.366 0.387 0.423 0.450 0.250 0.175 0.269 0.175 0.179 0.125 0.192 0.125 0.321 0.225 0.346 0.225 0.250 0.175 0.269 0.175 19 1 ⁄16 ⁄16 1 ⁄2 1 ⁄2 7 --`,,```,,,,````-`-`,,`,,`,`,,`--- Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS 68 Not for Resale Csk. Heads ⁄32 ⁄16 7 ⁄32 3 ⁄16 1 ⁄4 7 ⁄32 7 ⁄32 ⁄16 15 ⁄32 11 ⁄32 1 ⁄2 11 ⁄32 5 ⁄32 ⁄32 5 ⁄8 13 ⁄32 13 ⁄16 ⁄16 7 ⁄32 3 ⁄16 1 ⁄4 ⁄32 9 ⁄32 1 ⁄4 5 ⁄16 9 ⁄32 5 13 3 ⁄4 ⁄16 25 ⁄32 9 ⁄16 9 7 ⁄8 ⁄32 7 ⁄16 5 ⁄16 15 ⁄32 5 ⁄16 9 9 ⁄16 ⁄8 19 ⁄32 3 ⁄8 3 ⁄16 ⁄32 7 ⁄32 3 ⁄16 ⁄4 ⁄32 1 ⁄4 1 ⁄4 5 ⁄16 1 ⁄4 ⁄16 ⁄32 13 ⁄32 5 ⁄16 13 ⁄32 3 ⁄8 9 1 ⁄2 ⁄8 9 ⁄16 15 ⁄32 5 ⁄8 1 ⁄2 3 23 ⁄32 ⁄32 3 ⁄4 17 ⁄32 17 ASME B18.6.3-2010 Table 44 Dimensions of Threads and Points for Types D, F, G, and T Thread-Cutting Tapping Screws (Cont’d) --`,,```,,,,````-`-`,,`,,`,`,,`--- GENERAL NOTE: For additional requirements, refer to section 2. NOTES: (1) Points of screws shall be tapered and fluted or slotted as illustrated above for the respective types. The flute on Type T screws shall have an included angle of 90 deg to 95 deg and the thread cutting edge located above the axis of screw. Tapered threads shall have unfinished crests, and the flutes or slots shall extend through the first full thread beyond taper except for Type F screws on which tapered threads may be complete at manufacturer’s option and flutes may be one pitch short of the first full form thread. Other details of taper and flute design shall be optional with the manufacturer, provided the screws meet the specified performance requirements. (2) Where specifying nominal size in decimals, zeros preceding the decimal and in the fourth decimal place shall be omitted. (3) Screws of these nominal lengths and shorter shall have point taper lengths specified for short screws. Longer lengths shall have point taper lengths specified for long screws. 69 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Not for Resale ASME B18.6.3-2010 Table 45 Dimensions of Type TRS Tapping Screws C P L C L A A P A A 2 to 3 ½ pitch taper length Section A-A Section A-A Type RL Type TT L 2 to 4 pitch taper length L L P P P A 2 to 4 pitch taper length Type TR-3 2 to 3 ½ pitch taper length 2 to 3 ½ pitch taper length Type SF Type SW Maximum Major or C Dia., in. Section A-A Nominal Screw Size Basic Screw Diameter Maximum Point Dia., in. 2-56 3-48 4-40 5-40 6-32 8-32 10-24 0.0860 0.0990 0.1120 0.1250 0.1380 0.1640 0.1900 0.0875 0.1010 0.1145 0.1275 0.1410 0.1670 0.1940 0.0700 0.0810 0.0900 0.1030 0.1110 0.1370 0.1530 10-32 12-24 1 ⁄4-20 5 ⁄16-18 3 ⁄8-16 7 ⁄16-14 1 ⁄2-20 0.1900 0.2120 0.2500 0.3125 0.3750 0.4375 0.5000 0.1930 0.2200 0.2550 0.3180 0.3810 0.4445 0.5075 0.1630 0.1790 0.2060 0.2640 0.3200 0.3750 0.4330 GENERAL NOTE: The point diameter is acceptable if at least the first 360 deg thread enters a gage having a hole size equal to the specified maximum point diameter. The hole tolerance of the gage is +0/−0.001 in. --`,,```,,,,````-`-`,,`,,`,`,,`--- Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS 70 Not for Resale ASME B18.6.3-2010 Table 46 Thread Lengths for Types A, AB, B, BF, BP, and BT Tapping Screws Nominal Screw Length, L Equal to or Shorter Than Nominal Length, L Longer Than Nominal Length, L Fully Threaded Partially Threaded Type A Only Types AB, B, BF, BP, and BT Types A, AB, B, BF, BP, and BT Y Max. [Note (1)] Y Max. [Note (1)] Lr Min. [Note (2)] 0.025 0.031 0.031 0.036 0.021 0.024 0.031 0.036 0.360 0.440 0.520 0.590 ⁄16 ⁄16 1 11⁄8 0.042 0.050 0.056 0.062 0.042 0.050 0.050 0.053 0.670 0.750 0.830 0.910 11⁄4 13⁄8 15⁄8 13⁄4 0.067 0.083 0.091 0.100 0.056 0.062 0.071 ... 0.980 1.140 1.300 1.450 ⁄4 16 18 5 ⁄16 113⁄16 113⁄16 113⁄16 113⁄16 ... 0.100 0.111 ... 0.071 ... ... 0.083 1.500 1.500 1.500 1.500 20 24 3 ⁄8 7 ⁄16 1 ⁄2 17⁄8 17⁄8 17⁄8 17⁄8 17⁄8 0.111 0.111 ... ... ... ... ... 0.083 0.100 0.100 1.500 1.500 1.500 1.500 1.500 Nominal Screw Size 0 1 2 3 7 4 5 6 7 13 8 10 12 14 1 ⁄16 ⁄16 5 ⁄8 3 ⁄4 9 15 --`,,```,,,,````-`-`,,`,,`,`,,`--- NOTES: (1) Tabulated values are equal to 1 times the pitch length of the thread, rounded to three decimal places. (2) Tabulated values through No. 14 size are equal to 6 times the basic screw diameter, rounded to two decimal places. 71 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Not for Resale ASME B18.6.3-2010 Table 47 Thread Lengths for Types C, D, F, G, and T Tapping Screws Fully Threaded Unthreaded Length Under Head Nominal Screw Size 2 3 4 5 6 8 10 12 1 ⁄4 ⁄16 3 ⁄8 7 ⁄16 1 ⁄2 5 For Nominal Screw Lengths Equal to or Shorter Than Fine Thread 0.018 0.021 0.016 0.018 0.025 0.025 0.031 0.021 0.023 0.025 ⁄2 ⁄16 5 ⁄8 0.031 0.042 0.042 0.028 0.031 0.036 3 0.050 0.056 0.062 0.071 0.077 0.036 0.042 0.042 0.050 0.050 1 ⁄4 ⁄16 11 ⁄32 ⁄8 13 ⁄32 3 1 9 ⁄4 ⁄16 11⁄8 15⁄16 11⁄2 15 For Nominal Screw Lengths Y Max. [Note (1)] Coarse Thread 5 Unthreaded Length Under Head Longer Than Equal to or Shorter Than Partially Threaded Full-Form Thread Length Y Max. [Note (2)] For Nominal Screw Lengths Longer Than Coarse Thread Fine Thread 0.036 0.042 0.032 0.036 5 ⁄8 1 11⁄16 0.050 0.050 0.062 0.042 0.046 0.050 7 ⁄8 1 11⁄16 0.670 0.750 0.830 ⁄2 ⁄16 5 ⁄8 13⁄16 13⁄8 19⁄16 0.062 0.083 0.083 0.056 0.062 0.071 13⁄16 13⁄8 19⁄16 0.980 1.140 1.300 3 113⁄16 17⁄8 2 2 2 0.100 0.111 0.125 0.143 0.154 0.071 0.083 0.083 0.100 0.100 113⁄16 17⁄8 2 2 2 1.500 1.500 1.500 1.500 1.500 1 5 5 3 11 7 ⁄4 ⁄16 ⁄8 ⁄4 ⁄32 ⁄8 13 ⁄32 3 1 9 ⁄4 ⁄16 11⁄8 15⁄16 11⁄2 15 ⁄8 ⁄4 3 Lr Min. [Note (3)] 0.520 0.590 --`,,```,,,,````-`-`,,`,,`,`,,`--- NOTES: (1) Tabulated values are equal to 1 times the pitch length of the thread, rounded to three decimal places. (2) Tabulated values are equal to 2 times the pitch length of the thread, rounded to three decimal places. (3) Tabulated values through No. 12 size are equal to 6 times the basic screw diameter, rounded to two decimal places. 72 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Not for Resale 73 Not for Resale 0.1905 0.1905 0.1905 0.1905 0.1905 0.1905 0.1905 0.1905 0.1905 3 ⁄16 ⁄16 3 ⁄16 3 ⁄16 3 1 ⁄4 16 18 5 ⁄16 20 24 3 ⁄8 7 ⁄16 1 ⁄2 3 ⁄16 ⁄16 3 ⁄16 3 ⁄16 3 ⁄16 3 14 1 ⁄8 1 ⁄8 1 ⁄8 8 10 12 14 0.0770 0.1270 0.1270 0.1270 0.0500 0.0500 0.0770 0.0770 18 18 14 14 4 5 6 7 Min. 0.1845 0.1845 0.1845 0.1845 0.1845 0.1845 0.1845 0.1845 0.1845 0.0730 0.1230 0.1230 0.1230 0.0460 0.0460 0.0730 0.0730 0.0500 0.0460 0.0500 0.0460 18 18 Max. 2 3 Nominal Screw Size Gage Types AB, A, B, BP, and C --`,,```,,,,````-`-`,,`,,`,`,,`--- Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS ... ... 0.3780 ... ... 0.2530 ... ... 0.3155 0.1420 0.1905 0.1905 ... 0.1110 0.1110 0.1425 ... 0.0800 0.0960 Max. ... ... 0.3720 ... ... 0.2470 ... ... 0.3095 0.1380 0.1845 0.1845 ... 0.1070 0.1070 0.1385 ... 0.0760 0.0920 Min. Min. #44 #36 #32 #30 #48 #46 Drill Size ... ... ... ... 0.3800 0.3700 0.4425 0.4325 0.5050 0.4950 0.2540 0.2460 ... ... ... ... 0.3175 0.3075 L ⁄32 ... ... ... 11 ... B G ... 0.1905 0.1845 #29 0.1905 0.1845 #21 3 0.1905 0.1845 ⁄16 ... ... 5.5 mm 0.1270 0.1230 0.1270 0.1230 0.1270 0.1230 ... ... 0.1270 0.1230 0.1270 0.1230 Max. Type TRS 0.2900 0.3438 ... ... ... ... 0.2380 0.2610 ... 0.1360 0.1590 0.1875 0.2165 0.0860 0.1065 0.1160 0.1285 0.0760 0.0810 Hole Diam. Type A ... ... 21 ⁄64 13 ⁄32 15 ⁄32 5.5 mm ... ... I #29 #21 3 ⁄16 ... #44 #36 #32 #30 #48 #46 Drill Size ... ... 0.3281 0.4062 0.4688 0.2165 ... ... 0.2720 0.1360 0.1590 0.1875 ... 0.0860 0.1065 0.1160 0.1285 0.0760 0.0810 Hole Diam. Types AB, B, and BP ... ... R ... ... 7 ⁄32 ... ... J #27 #19 #11 ... #41 #35 #31 ... #48 #44 Drill Size ... ... 0.3390 ... ... 0.2188 ... ... 0.2770 0.1440 0.1660 0.1910 ... 0.0960 0.1100 0.1200 ... 0.0760 0.0860 Hole Diam. Coarse Thread ... ... 11 ⁄32 ... ... 1 ... ... L #26 ⁄64 #10 ... 11 #40 #35 1 ⁄8 ... #48 #43 ... ... 0.3438 ... ... 0.2280 ... ... 0.2900 0.1470 0.1719 0.1935 ... 0.0980 0.1100 0.1250 ... 0.0760 0.0890 Hole Diam. Fine Thread Drill Size Type C ... ... T ... ... 1 ... ... L #26 #17 #8 ... #41 #37 #31 ... #49 #46 ... ... 0.3580 ... ... 0.2280 ... ... 0.2900 0.1470 0.1730 0.1990 ... 0.0960 0.1010 0.1200 ... 0.0730 0.0810 Hole Diam. ... ... T ... ... A ... ... M ... #16 ... ... ... ... ... ... ... ... Drill Size Hole Dia 0 ... ... J #26 #19 #11 ... #40 #35 #31 ... 0.219 ... ... 0.277 0.147 0.166 0.191 ... 0.098 0.110 0.120 ... 1.90 mm 0.075 2.20 mm 0.087 Drill Size Coarse Thread ... ... ... ... ... ... ... ... ... ... ⁄64 ... ... 11 ... ... ... ... ... ... ... ... ... ... 0.456 ... ... ... ... ... 0.172 ... ... ... ... ... ... ... ... Hole Dia Fine Thread Drill Size Type TRS ... ... ... ... ... ... 0.3580 R 0.339 ... 10.0 mm 0.394 ... ... ... 0.2340 ... ... 0.2950 ... 0.1770 ... ... ... ... ... ... ... ... Hole Diam. Fine Thread Types D, F, G, and T Coarse Thread Drill Size Hole Size Standard Test-Plate Thickness and Hole Sizes for Drive-Test Inspection of Tapping Screws Types D, F, G, and T Thickness Table 48 ASME B18.6.3-2010 ASME B18.6.3-2010 Table 49 Maximum Drive Torque for Type TRS Tapping Screws Type TRS Maximum Drive Torque Nominal Screw Size Basic Screw Diameter in.-lb ft-lb 2-56 3-48 4-40 5-40 6-32 8-32 10-24 0.0860 0.0990 0.1120 0.1250 0.1380 0.1640 0.1900 6 9.5 13 16 20 32 52 ... ... ... ... ... ... ... 10-32 12-24 1 ⁄4-20 5 ⁄16-18 3 ⁄8-16 7 ⁄16-14 1 ⁄2-13 0.1900 0.2120 0.2500 0.3125 0.3750 0.4375 0.5000 60 77 120 240 300 480 660 ... ... 10 20 25 40 55 GENERAL NOTE: These are the maximum drive values regardless of plating or coating on the parts. --`,,```,,,,````-`-`,,`,,`,`,,`--- Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS 74 Not for Resale ASME B18.6.3-2010 Minimum Torsional Strength, lb-in. Types AB, B, BF, BP, and BT Nominal Screw Size Type A 2 3 4 9 4 9 4 5 6 7 12 18 24 30 8 10 12 14 Types C, D, F, G, and T Coarse Thread Fine Thread Coarse Thread Fine Thread 5 9 6 10 6 10 ... ... 13 18 24 30 13 18 23 ... 15 20 27 ... 14 22 24 ... ... ... ... ... 39 48 83 125 39 56 88 ... 42 56 93 ... 47 74 108 ... 48 65 93 ... ... 74 ... ... 1 ⁄4 16 18 5 ⁄16 ... 152 196 ... 142 ... ... 290 140 ... ... 306 179 ... ... 370 156 ... ... 330 ... ... ... ... 20 24 3 ⁄8 7 ⁄16 1 ⁄2 250 492 ... ... ... ... ... 590 620 1,020 ... ... 560 700 1,075 ... ... 710 820 1,285 ... ... 600 840 ... ... ... ... ... 1,080 75 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Type TRS Torsional Strength Not for Resale --`,,```,,,,````-`-`,,`,,`,`,,`--- Table 50 Torsional Strength Requirements for Tapping Screws ASME B18.6.3-2010 Table 51 Dimensions of Round Head Type U Metallic Drive Screws L H S A Nominal Size [Note (1)] or Basic Screw Diameter P D Outside Diameter, D Number of Thread Starts Max. Head Diameter, A Head Height, H Pilot Diameter, P Recommended Hole Size Min. Max. Min. Max. Min. Max. Min. Drill Size No. Hole Diameter 00 0 2 4 0.0600 0.0750 0.1000 0.1160 6 6 8 7 0.060 0.075 0.100 0.116 0.057 0.072 0.097 0.112 0.099 0.127 0.162 0.211 0.090 0.118 0.146 0.193 0.034 0.049 0.069 0.086 0.026 0.041 0.059 0.075 0.049 0.063 0.083 0.096 0.046 0.060 0.080 0.092 55 51 44 37 0.052 0.067 0.086 0.104 6 7 8 0.1400 0.1540 0.1670 7 8 8 0.140 0.154 0.167 0.136 0.150 0.162 0.260 0.285 0.309 0.240 0.264 0.287 0.103 0.111 0.120 0.091 0.099 0.107 0.116 0.126 0.136 0.112 0.122 0.132 31 29 27 0.120 0.136 0.144 10 12 14 0.1820 0.2120 0.2420 8 8 9 0.182 0.212 0.242 0.177 0.206 0.236 0.359 0.408 0.457 0.334 0.382 0.429 0.137 0.153 0.170 0.123 0.139 0.155 0.150 0.177 0.202 0.146 0.173 0.198 20 11 2 0.161 0.191 0.221 5 0.3150 0.3780 11 12 0.315 0.378 0.309 0.371 0.590 0.708 0.557 0.670 0.216 0.256 0.198 0.237 0.272 0.334 0.267 0.329 M T 0.295 0.358 1 ⁄8 0.047 3 ⁄16 0.047 1 ⁄4 0.047 5 ⁄16 0.047 3 ⁄8 0.062 1 ⁄2 0.062 5 ⁄8 0.078 ⁄16 ⁄8 3 Nominal Screw Length, L Pilot Length ±0.015, S 3 ⁄4 0.078 1 in. and over 0.125 GENERAL NOTE: For additional requirements, refer to section 5. NOTE: (1) Where specifying nominal size in decimals, zeros preceding the decimal and in the fourth decimal place shall be omitted. --`,,```,,,,````-`-`,,`,,`,`,,`--- 76 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Not for Resale ASME B18.6.3-2010 MANDATORY APPENDIX I PROTRUSION GAGING OF FLAT COUNTERSUNK HEADS Suitability of flat countersunk head screws, except the No. 0000, No. 000, and No. 00 sizes, and undercut flat countersunk head screws, except the No. 0 and No. 1 sizes, for application in countersinks designed to the principal dimensions of the screws may be determined by the use of a protrusion gage as illustrated in Fig. I-1. The gaging dimensions and the gage diameters are specified in the dimensional tables for flat countersunk head and undercut flat countersunk head screws. The protrusion limits shown in the tables shall apply only when the gaging diameter is exactly as indicated, with the gaging edge of a sharpness obtained by lapping the hole and the top surface of the gage. Any variation in the gaging diameter will require recalculation of protrusion values by the original formulas given below. Minimum protrusion:1, 2 Maximum protrusion:1, 2 where A p head diameter (maximum or minimum for maximum or minimum protrusion, respectively) F p tabulated protrusion value F′ p corrected protrusion value G p tabulated gage diameter G′ p measured gage diameter Min. sharp head diameter − gage hole diameter 2 Max. head angle ⴛ tan 90 deg − 2 Min. F p 冢 or correction of protrusion in accordance with the following formula: F′ p F Max. sharp head diameter − gage hole diameter 2 Min. head angle ⴛ tan 90 deg − 2 Max. F p 冢 冣 冣 1 Protrusion values shown in dimensional tables were calculated from these formulas and rounded to the nearest 0.001 in., upward for the maximum and downward for the minimum. 2 See formulas for maximum and minimum sharp head diameters in Nonmandatory Appendix C. A − G′ A−G To ensure adequate service life, the protrusion gage should be made of tool steel having a hardness of not less than 60 Rockwell C (60 HRC). --`,,```,,,,````-`-`,,`,,`,`,,`--- Fig. I-1 Protrusion Gage 77 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Not for Resale ASME B18.6.3-2010 MANDATORY APPENDIX II ACROSS-CORNERS GAGING OF HEX HEADS Suitability of across-corners dimensions of hex head and hex washer head screws may be determined by the use of gaging rings as described below. When the gaging ring is placed on the top of a hex or hex washer head screw, and also on the bottom of a hex head screw, at right angles to the axis of the screw, the head (hex portion of washer head) must protrude beyond the ring by an amount equal to 60% of the minimum head height, H. For convenience, the minimum protrusion values are given in the dimensional tables for hex and hex washer head screws. The gaging ring shall have an inside diameter equal to the tabulated minimum width across-corners, within a tolerance of +0.0003 in. The gaging edges of the ring shall be sharp, and opposite faces shall be parallel. To insure adequate service life, the ring should be made of tool steel and have a hardness of not less than 60 Rockwell C. A typical gaging fixture is shown in Fig. II-1 with an explanation of its application; however, any equivalent means may be used. To check hex head screws from the top, an initial reading shall be taken with the gaging ring placed on the indexing plate. Then, with the screw placed in the fixture, the gaging ring shall be placed on top of the screw head and a second reading taken. The difference between the two readings is equal to the protrusion, F, of the head beyond the gaging ring. To check hex washer head screws, the gaging procedure shall be exactly the same as that for checking hex head screws from the top. However, in this case, the difference, X, between the two readings includes the washer thickness, and it is necessary to deduct the actual (measured) thickness of the washer portion from the difference, X, to obtain the protrusion, F, of the hex beyond the gaging ring. Gaging the bottom of the head on hex head screws may be accomplished in the same manner as gaging the top, except the ring is placed below the head. The same protrusion values shall apply. Fig. II-1 Typical Gaging Fixture Must be parallel Special micrometer body Indexing plate with slots for screws Thickness optional Support plate Gaging ring Sharp corners Gaging ring Diameter optional F F Gaging Hex Head From Top Gaging Hex Washer Head --`,,```,,,,````-`-`,,`,,`,`,,`--- 78 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Not for Resale ASME B18.6.3-2010 MANDATORY APPENDIX III GAGING OF RECESSED HEADS, TYPES I, IA, AND III1 III-I PENETRATION GAGING Fig. III-1 Penetration Gage for Types I, IA, and III Recesses Penetration gaging is a test to determine the suitability of recesses in the heads of screws and may be used to indicate deficiencies in the dimensional aspects of the recesses specified in the dimensional tables. (Refer to Fig. III-1 for illustration of penetration gages for Types I, IA, and III recesses.) Penetrations that are too deep indicate the possibility of a thin section between the head and the shank of the screw, a weakness that might result in twisting-off screw heads during tightening of the screws. Screws with shallow penetration might result in production problems such as reaming of recess or excessive wear on driver bits. Penetration gaging depth values for the various styles of recessed heads are included in the dimensional tables for the respective heads. These values were predicated originally on the gaging of plain finish (unplated or uncoated) screws. However, subsequent experience has shown that the Type I recess penetration limits as tabulated, and the Type IA and Type III recess penetration depths with the tabulated minimum limit reduced by up to 0.005 in., are suitable for the gaging of screws having coating thickness of up to and including 0.0003 in., on significant surfaces. See Table III-1. This allowance makes up for the loss of depth brought about by the plating buildup on the sides of the recess. Screws having heavier coatings, which fail to meet minimum penetration, must be stripped of finish and gaged for acceptance or rejection in the plain condition. Specified in Tables III-2 through III-5 are dimensions of gage points to be used for penetration gaging the Types I, IA, and III recesses. These gage points approach as nearly as possible the perfect driver form. Also specified are gage heads and bushings, which adapt the gage points to standard dial gages. Penetration depths for Types I and IA recesses are gaged relative to a reference plane defined by the intersection of the edge of the recess wings with the top surface of the screw head. This plane is the same as the top surface on flat head screws but is somewhat below the topmost point on heads with rounded top surfaces. Knife edges or tapered ridges on the gage head are used to establish the reference plane. Penetration depths for Type III recesses are gaged relative to a reference plane defined by the intersection of the edge of the recess square with the top surface of 1 the screw head. This plane is the same as the top surface on flat head screws but may be somewhat below the topmost point on heads with rounded top surfaces. A reverse reading indicator is used to determine the penetration of the gage point into the recess. The gage may be zeroed on any flat surface. III-2 FIT GAGING ON TYPE III RECESSES In addition to the penetration gage, a “fit” gage is also required for Type III recesses. Dimensions for fit gage points are specified in Table III-5. Fit is gaged by the insertion of the gage point into the recess, and a determination made as to how well the gage seats into the recess. The gage should produce a very tight fit with the recess. This is sometimes referred to a “stick fit.“ A lack of this tight fit may indicate a problem with the shape of the recess. The fit gage and the penetration gage combine to effectively determine the suitability of the Type III recess. See Mandatory Appendix VII for Type VI information. --`,,```,,,,````-`-`,,`,,`,`,,`--- Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS 79 Not for Resale ASME B18.6.3-2010 Table III-1 Dimensions of Gage Heads for Types I, IA, and III Recesses Recess Gage Type Size A (±0.002) B (±0.003) C (±0.0002) D (±0.001) E (±0.005) F (±0.005) G (±0.005) I and IA No. No. No. No. No. No. 0 1 2 3 4 5 0.008 0.012 0.018 0.022 0.031 0.041 0.015 0.020 0.031 0.037 0.062 0.094 0.0460 0.0880 0.1420 0.2100 0.3130 0.5010 0.377 0.377 0.377 0.377 0.377 0.550 0.562 0.562 0.562 0.562 0.562 0.750 1.688 1.688 1.688 1.688 1.688 1.896 1.126 1.126 1.126 1.126 1.126 1.134 III No. No. No. No. 1 2 3 4 N/A N/A N/A N/A N/A N/A N/A N/A 0.1420 0.1615 0.2100 0.2715 0.377 0.377 0.377 0.377 0.562 0.562 0.562 0.562 1.688 1.688 1.688 1.688 1.126 1.126 1.126 1.126 80 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS --`,,```,,,,````-`-`,,`,,`,`,,`--- Not for Resale ASME B18.6.3-2010 Table III-2 Dimensions of Gage Heads for Type I Recess Dimensions of Gage Points Point Diam., A Point Width, B Size of Recess Gage +0.0000 ±0.0002 −0.0010 No. 0 0.0450 No. No. No. No. No. 0.0870 0.1410 0.2090 0.3120 0.5000 1 2 3 4 5 GENERAL NOTE: Point Width, G Base Flute Angle, K Milling Angle, H Length, C Length, D Diam., E Wing Thickness, F ±0.005 ±0.005 ±0.005 Max. Min. 0.0240 0.656 0.781 0.094 0.012 0.010 0.0320 7°00′ 0.015 0.010 0.0394 0.0606 0.0983 0.1407 0.2310 0.688 0.750 0.781 0.844 1.031 0.812 0.875 0.906 0.969 1.156 0.156 0.219 0.250 0.359 0.531 0.020 0.025 0.031 0.044 0.063 0.018 0.023 0.029 0.042 0.061 0.0500 0.0900 0.1500 0.2000 0.3110 7°00′ 5°45′ 5°45′ 7°00′ 7°00′ 0.020 0.020 0.020 0.020 0.025 0.015 0.015 0.015 0.015 0.020 For additional reference, see Table III-1 illustration. NOTES: (1) Base of flute on size No. 0 is 0.0090-in. to 0.0109-in. radius. (2) Tolerance on size No. 0 is +0.0000 and −0.0026 in. --`,,```,,,,````-`-`,,`,,`,`,,`--- Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS 81 Not for Resale Flat on End, J +0.0010 +0°00′ −0.0000 −0°15′ Max. Min. Side Flute Flute Width at Angle, Bottom, L M +0°15′ +0°15′ +0.0000 −0°00′ −0°00′ −0.0010 [Note (1)]92°00′ 0.0151 [Note (2)] 138°00′ 92°00′ 0.0202 140°00′ 92°00′ 0.0434 146°00′ 92°00′ 0.0826 153°00′ 92°00′ 0.1078 162°46′ 92°00′ 0.1730 ASME B18.6.3-2010 Table III-3 Dimensions of Gage Points for Type IA Recess No. No. No. No. No. No. 0 1 2 3 4 5 Size of Recess Gage No. No. No. No. No. No. Point Diameter, A (±0.0002) 0 1 2 3 4 5 0.0450 0.0870 0.1410 0.2090 0.3120 0.5000 Max. Min. Length, C (±0.005) 0.0280 0.0438 0.0670 0.1020 0.1520 0.2420 0.0265 0.0423 0.0655 0.1005 0.1505 0.2400 0.656 0.688 0.750 0.781 0.844 1.031 Length, D (±0.005) Diameter, E (±0.005) Wing Thickness, F (+0.0010 −0.0000) Point Width G (+0.001 −0.000) 0.781 0.812 0.875 0.906 0.969 1.156 0.094 0.156 0.219 0.250 0.359 0.531 0.0165 0.0265 0.0380 0.0530 0.0810 0.0910 0.035 0.054 0.095 0.155 0.203 0.315 Milling Angle, H (+0°00′ −0°06′) Milling Offset Angle, J (+0°06′ −0°00′) Milling Offset Angle, K (+0°06′ −0°00′) Rib Form Angle, L (+0°07′ −0°00′) [Note (1)] Wing Form Angle, M, (+0°07′ −0°00′) [Note (1)] 7° 7° 5° 5° 7° 7° 4° 4° 3° 3° 4° 4° 7° 7° 6° 6° 7° 7° 46° 46° 46° 56° 56° 56° 46° 46° 46° 46° 46° 46° 00′ 00′ 45′ 45′ 00′ 00′ 23′ 23′ 00′ 00′ 23′ 23′ 45′ 45′ 20′ 20′ 45′ 45′ 00′ 00′ 00′ 15′ 15′ 15′ 00′ 00′ 00′ 00′ 00′ 00′ NOTE: (1) These dimensions are measured normal to the milling cut. 82 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Wing Offset Angle, N 22′ 22′ 17′ 17′ 22′ 22′ Wing Offset Angle, N1 2° 2° 2° 2° 2° 2° 00′ 00′ 04′ 04′ 00′ 00′ Flat on End, P (+0.005 −0.000) Max. Min. 0.010 0.015 0.015 0.015 0.015 0.020 0.004 0.005 0.008 0.012 0.020 0.040 0.003 0.004 0.006 0.008 0.014 0.035 Radius, R --`,,```,,,,````-`-`,,`,,`,`,,`--- Size of Recess Gage Point Width, B (at Base of Radius, R) Not for Resale ASME B18.6.3-2010 Table III-4 Dimensions of Type III Square Penetration Gage Points D C 90⬚ ± 10⬘ F A E B Sharp Grind square to axis Size of Recess Gage 00 0 1 2 3 4 90⬚ ± 10⬘ Radius Gage Point Diameter, A Width Across Flats, B Stem Length, C Overall Length, D Head Diameter, E Point Length, F +0.0005 −0.0000 +0.0005 −0.0000 +0.005 −0.005 +0.005 −0.005 +0.000 −0.015 +0.030 −0.000 0.1005 0.1005 0.1405 0.1605 0.2085 0.2705 0.0490 0.0690 0.0900 0.1110 0.1315 0.1895 0.785 0.785 0.785 0.785 0.785 0.785 0.875 0.875 0.875 0.875 0.875 0.875 0.187 0.187 0.187 0.250 0.250 0.312 0.075 0.125 0.187 0.187 0.187 0.212 --`,,```,,,,````-`-`,,`,,`,`,,`--- 83 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Not for Resale ASME B18.6.3-2010 Table III-5 Dimensions of Type III Square Fit Gage Points D C 2½° A B Across Flats at Point, A Across Corners, B Across Flats at Top, C Gaging Lines Length, D Size of Recess Gage Max. Min. Ref. Ref. Max. Min. GO NO GO GO NO GO 0 1 2 3 4 0.0700 0.0908 0.1121 0.1327 0.1905 0.0695 0.0903 0.1116 0.1322 0.1900 0.1153 0.1447 0.1787 0.2117 0.3012 0.0815 0.1023 0.1263 0.1497 0.2130 0.145 0.145 0.176 0.207 0.270 0.125 0.125 0.156 0.187 0.250 0.014/0.019 0.039/0.046 0.049/0.056 0.069/0.076 0.074/0.081 0.035/0.038 0.060/0.065 0.070/0.075 0.090/0.095 0.095/0.100 N/A 0.029/0.041 0.037/0.049 0.054/0.066 N/A N/A 0.045/0.055 0.053/0.063 0.070/0.080 N/A Regular Socket “R” --`,,```,,,,````-`-`,,`,,`,`,,`--- 84 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Not for Resale Short Socket “S” ASME B18.6.3-2010 MANDATORY APPENDIX IV WOBBLE GAGING OF RECESSED HEADS Wobble gaging provides a means for determining the compatibility of recesses in the heads of screws with companion screw drivers, and will indicate the point where deviations in the recess contours affect satisfactory driver engagement. Recesses that exhibit excessive wobble characteristics will result in poor screw driveability because of driver cam-out prior to attaining normal torque level, damage to recesses, accelerated driver wear, or a combination thereof. The allowable total wobble gaging limits for the various types of recesses included herein were predicated originally on the gaging of plain finish (unplated or uncoated) screws. However, subsequent experience has shown these limits to be suitable for the gaging of screws having coating thickness up to and including 0.0003 in., on significant surfaces. Screws having heavier coatings that fail to meet the wobble gaging requirements must be stripped of finish and gaged for acceptance or rejection in the plain condition. Wobble gaging fixtures, as illustrated in Fig. IV-1, and appropriate recess master plug gages with handles and position indicators punch for the respective recess types are available through the screw suppliers. Dimensions of the points on master plug gages are, except for the body diameters tabulated herein, the same as those specified for the respective gage points in Mandatory Appendix III. The screw to be gaged shall be placed into the screw-holding chuck and oriented such that one set of recess wings or one side is parallel to the upright back plate. The screw shall be so positioned and the chuck shall be tightened sufficiently to prevent any tilting of the screw in the chuck when taking wobble readings. The position gage pointer and handle with the proper master plug gage for the recess size being checked shall be positioned in the slot of the degree scale on the top plate and the point of the plug gage inserted into the screw recess. It is essential that registry between the cross lines of the pointer and the recess wings or side be maintained. To correct any misalignment, the chuck position lock screw should be loosened, the chuck rotated until registry is obtained, and the chuck raised or lowered until the gage pointer is flush with the top of the degree scale. The chuck position lock screw should then be tightened and the readings taken. The gage handle, with downward pressure applied, should be moved from side to side until resistance is encountered and the total reading between points of travel of the gage pointer is recorded. The allowable angular wobble limits shall not exceed the values tabulated in Tables IV-1, IV-2, and IV-3. Cross lines on the gage pointer should be rechecked with plug gage wings or flats to make certain cross lines and gage wings or flats are registered on identical radials. 85 --`,,```,,,,````-`-`,,`,,`,`,,`--- Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Not for Resale ASME B18.6.3-2010 Fig. IV-1 Wobble Gaging Fixture Top plate with degree scale calibrated on basis of 4.250 in. radius Cross lines on end of pointer Back plate Plug gage handle and pointer Recess master plug gage WOBBLE G Enlarged Detail NE BLACK LI E IN 5 DEGRE Gage body diameter Recessed screw mounted in chuck Chuck for holding screw Gage base Chuck position lock screw --`,,```,,,,````-`-`,,`,,`,`,,`--- 86 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Not for Resale ASME B18.6.3-2010 Table IV-3 Gaging Limits for Type II Recess Table IV-1 Gage Body Diameters Type I Recess Size of Recess Gage No. No. No. No. No. No. Type IA Recess Ground Gage 0 1 2 3 4 5 Ground Gage Pressed Gage Max. Min. Max. Min. Max. Min. 0.135 0.198 0.260 0.323 0.385 0.760 0.115 0.178 0.240 0.303 0.365 0.740 0.135 0.198 0.260 0.323 0.385 0.760 0.115 0.178 0.240 0.303 0.365 0.740 ... 0.275 0.275 0.370 0.475 ... ... 0.255 0.255 0.350 0.455 ... GENERAL NOTE: Diameters of Type II recess gages are same as penetration gage points shown in Mandatory Appendix III. Table IV-2 Gaging Limits for Types I, IA, and III Recesses Size of Recess Gage No. No. No. No. No. No. 0 1 2 3 4 5 Maximum Allowable Total Wobble, deg Type I Type IA Type III N/A 15 12 10 10 10 N/A 12 10 8 8 8 N/A 3 3 3 3 N/A --`,,```,,,,````-`-`,,`,,`,`,,`--- 87 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Not for Resale Recess Gage Diameter Maximum Allowable Total Wobble, deg 0.093 0.141 0.246 0.436 12 10 8 6 ASME B18.6.3-2010 MANDATORY APPENDIX V DIMENSIONS FOR NO. 0000, NO. 000, AND NO. 00 THREAD SIZES --`,,```,,,,````-`-`,,`,,`,`,,`--- The dimensional data for the No. 0000, No. 000, and No. 00 thread sizes is provided in Table V-1 for convenient reference until such time as these thread sizes may be adequately documented in an appropriate standard relating specifically to screw threads. 88 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Not for Resale ASME B18.6.3-2010 Table V-1 Dimensions for No. 0000, No. 000, and No. 00 Thread Sizes Nominal Size and Threads per Inch [Note (1)] External Major Diameter Pitch Diameter Series Designation Class Allowance Max. Min. Max. Min. Tol. Minor Diameter 0000–160 or 0.0210–160 NS 2 0.0000 0.0210 0.0195 0.0169 0.0158 0.0011 0.0128 000–120 or 0.0340–120 NS 2 0.0000 0.0340 0.0325 0.0286 0.0272 0.0014 0.0232 00–90 or 0.0470–90 NS 2 0.0000 0.0470 0.0450 0.0398 0.0382 0.0016 0.0326 00–96 or 0.0470–96 NS 2 0.0000 0.0470 0.0450 0.0402 0.0386 0.0016 0.0334 Internal Nominal Size and Threads per Inch [Note (1)] Minor Diameter [Note (2)] Series Designation Class Min. Max. Min. Max. Tol. Major Diameter, Min. 0000–160 or 0.0210–160 NS 2 ... ... 0.0169 0.0181 0.0012 0.0210 000–120 or 0.0340–120 NS 2 ... ... 0.0286 0.0300 0.0014 0.0340 00–90 or 0.0470–90 NS 2 ... ... 0.0398 0.0414 0.0016 0.0470 00–96 or 0.0470–96 NS 2 ... ... 0.0402 0.0418 0.0016 0.0470 Pitch Diameter NOTES: (1) Where specifying nominal size in decimals, zeros preceding the decimal and in the fourth decimal place shall be omitted. (2) The minor diameter limits for internal threads are not specified; they are determined by the amount of thread engagement necessary to satisfy the strength requirements and tapping performance in the intended application. --`,,```,,,,````-`-`,,`,,`,`,,`--- Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS 89 Not for Resale ASME B18.6.3-2010 MANDATORY APPENDIX VI DIMENSIONS OF TYPE C TAPPING SCREWS For dimensions of threads and points for Type C thread-forming tapping screws, see Table VI-1. --`,,```,,,,````-`-`,,`,,`,`,,`--- 90 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Not for Resale ASME B18.6.3-2010 Table VI-1 Dimensions of Threads and Points for Type C Thread-Forming Tapping Screws Nominal Size [Note (2)] or Basic Screw Diameter Threads per Inch Major Diameter, D Point Diameter, P Point Taper Length, S [Note (3)] For Short Screws For Long Screws Max. Min. Ref. Max. Min. Max. Min. Determinant Lengths for Point Taper, L [Note (3)] 90-deg Heads Csk. Heads --`,,```,,,,````-`-`,,`,,`,`,,`--- 2 2 3 3 0.0860 0.0860 0.0990 0.0990 56 64 48 56 0.0860 0.0860 0.0990 0.0990 0.0813 0.0816 0.0938 0.0942 0.068 0.070 0.078 0.081 0.062 0.055 0.073 0.062 0.045 0.039 0.052 0.045 0.080 0.070 0.094 0.080 0.062 0.055 0.073 0.062 5 4 4 5 5 6 6 0.1120 0.1120 0.1250 0.1250 0.1380 0.1380 40 48 40 44 32 40 0.1120 0.1120 0.1250 0.1250 0.1380 0.1380 0.1061 0.1068 0.1191 0.1195 0.1312 0.1321 0.087 0.091 0.100 0.102 0.107 0.113 0.088 0.073 0.088 0.080 0.109 0.088 0.062 0.052 0.062 0.057 0.078 0.062 0.112 0.094 0.112 0.102 0.141 0.112 0.088 0.073 0.088 0.080 0.109 0.088 7 8 8 10 10 12 12 1 ⁄4 1 ⁄4 5 ⁄16 5 ⁄16 3 ⁄8 3 ⁄8 0.1640 0.1640 0.1900 0.1900 0.2160 0.2160 0.2500 0.2500 0.3125 0.3125 0.3750 0.3750 32 36 24 32 24 28 20 28 18 24 16 24 0.1640 0.1640 0.1900 0.1900 0.2160 0.2160 0.2500 0.2500 0.3125 0.3125 0.3750 0.3750 0.1571 0.1577 0.1818 0.1831 0.2078 0.2085 0.2408 0.2425 0.3026 0.3042 0.3643 0.3667 0.132 0.136 0.148 0.158 0.174 0.180 0.200 0.214 0.257 0.271 0.312 0.333 0.109 0.097 0.146 0.109 0.146 0.125 0.175 0.125 0.194 0.146 0.219 0.146 0.078 0.069 0.104 0.078 0.104 0.089 0.125 0.089 0.139 0.104 0.156 0.104 0.141 0.125 0.188 0.141 0.188 0.161 0.225 0.161 0.250 0.188 0.281 0.188 0.109 0.097 0.146 0.109 0.146 0.125 0.175 0.125 0.194 0.146 0.219 0.146 ⁄4 ⁄32 11 ⁄32 1 ⁄4 11 ⁄32 5 ⁄16 13 ⁄32 5 ⁄16 15 ⁄32 11 ⁄32 1 ⁄2 11 ⁄32 ⁄32 ⁄16 7 ⁄16 11 ⁄32 7 ⁄16 13 ⁄32 17 ⁄32 13 ⁄32 19 ⁄32 15 ⁄32 11 ⁄16 1 ⁄2 7 0.4375 0.4375 0.5000 0.5000 14 20 13 20 0.4375 0.4375 0.5000 0.5000 0.4258 0.4281 0.4876 0.4906 0.366 0.387 0.423 0.450 0.250 0.175 0.269 0.175 0.179 0.125 0.192 0.125 0.321 0.225 0.346 0.225 0.250 0.175 0.269 0.175 19 ⁄4 ⁄16 25 ⁄32 9 ⁄16 ⁄16 ⁄16 1 ⁄2 1 ⁄2 7 ⁄32 1 ⁄8 3 ⁄16 5 ⁄32 3 Minimum Practical Nominal Screw Lengths, L 90-deg Heads 5 3 1 5 1 7 5 ⁄16 ⁄32 3 ⁄16 3 ⁄16 1 ⁄4 3 ⁄16 ⁄4 ⁄32 1 ⁄4 1 ⁄4 5 ⁄16 1 ⁄4 1 5 ⁄16 ⁄16 7 ⁄32 3 ⁄16 ⁄32 ⁄8 5 ⁄32 5 ⁄32 3 ⁄32 ⁄16 7 ⁄32 3 ⁄16 1 ⁄4 7 ⁄32 ⁄4 ⁄32 9 ⁄32 1 ⁄4 5 ⁄16 9 ⁄32 3 1 11 ⁄4 ⁄32 5 ⁄16 1 ⁄4 5 ⁄16 9 ⁄32 3 ⁄8 9 ⁄32 7 ⁄16 5 ⁄16 15 ⁄32 5 ⁄16 3 7 ⁄32 ⁄32 5 ⁄8 13 ⁄32 13 Csk. Heads 5 3 9 7 9 ⁄16 ⁄8 19 ⁄32 3 ⁄8 3 ⁄16 ⁄32 7 ⁄32 3 ⁄16 1 7 ⁄16 ⁄32 13 ⁄32 5 ⁄16 13 ⁄32 3 ⁄8 1 ⁄2 3 ⁄8 9 ⁄16 15 ⁄32 5 ⁄8 1 ⁄2 9 23 ⁄32 ⁄32 3 ⁄4 17 ⁄32 17 GENERAL NOTES: (a) For additional requirements, refer to section 4. (b) Not recommended for new designs. See para. 4.1.1.5. NOTES: (1) Threads within point taper length shall have unfinished crests. (2) Where specifying nominal size in decimals, zeros preceding the decimal and in the fourth decimal place shall be omitted. (3) Screws of these nominal lengths and shorter shall have point taper lengths specified for short screws. Longer lengths shall have point taper lengths specified for long screws. 91 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Not for Resale ASME B18.6.3-2010 MANDATORY APPENDIX VII TYPE VI RECESS GAGE REQUIREMENTS VII-1 SCOPE Internal gages measure the depth that each of the gaging elements enters the recess. To obtain accurate measurements, the gage must be inspected periodically to assure the gage’s indicator registers zero when the gaging element is depressed into the gage body where the end of the gage element is flush with the face of the gage body. This Appendix outlines the inspection method and acceptance criteria for internal fastener drive configurations having six lobes. VII-2 DEFINITION The recess drive system configuration is a gearlike shape comprised of six equally spaced external radii connected by six equally spaced internal radii recessed into the product’s head. The recess penetration depth, I, maximum fallaway depth, and maximum counterbore depth shall be inspected for the requirements specified in this Standard. See Table VII-1. VII-3 VII-5 The internal drive is acceptable only if it conforms to the four inspections described in paras. VII-5.1 through VII-5.4. VII-5.1 Penetration Depth. The GO gage shall enter the recess to the depth indicated by the product specification or print. GAGE TYPE VII-5.2 Counterbore Depth. Rotate the GO gage 15 deg to prevent alignment with the lobes of the recess. Place it into the top portion of the recess. The depth must not exceed the counterbore depth defined in this Standard. Gages shall be manufactured of tool steel hardened and tempered to a minimum of Rockwell C61. VII-3.1 GO Gages The internal GO gages inspect the acceptability of the configuration, the depth of the internal drive, or both. VII-5.3 Lobe Fallaway Depth. The lobular NO GO gage must not enter the recess more than the maximum depth indicated in this Standard. VII-3.2 NO GO Gages VII-5.4 I.D. Fallaway Depth. The cylindrical NO GO gage must not enter the recess more than the maximum depth indicated by the product specification or print. The same fallaway value applies to both the lobed and cylindrical gage inspection. The internal NO GO gages determine the amount of nonconforming configuration (fallaway) present in the internal drive. VII-4 RECESS ACCEPTABILITY INSPECTION The gaging for the internal drive consists of one GO gage and two NO GO gages. One NO GO gage inspects the external radii and the circumscribing diameter created around them. The second NO GO gage inspects the inscribing circle created by the six-point tangent to the extreme points of the six internal radii. VII-6 RECESS UNACCEPTABILITY Screws having heavy coatings that fail to meet the penetration gaging requirements shall be stripped of the coating and inspected for acceptance in the plain (uncoated) condition. 92 --`,,```,,,,````-`-`,,`,,`,`,,`--- Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Not for Resale --`,,```,,,,````-`-`,,`,,`,`,,`--- 93 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Not for Resale 0.1303 0.1533 0.1758 0.1978 0.2188 15 20 25 27 30 0.1297 0.1527 0.1752 0.1972 0.2182 0.0667 2.0792 0.0919 0.0992 0.1087 0.0932 0.1094 0.1254 0.1409 0.1564 0.0482 0.0572 0.0664 0.0718 0.0785 0.0673 0.0798 0.0925 0.0998 0.1093 6 7 8 9 10 0.0926 0.1088 0.1248 0.1403 0.1558 0.0476 0.0566 0.0658 0.0712 0.0779 Min. Max. Max. Min. Width Between Lobes, N Diameter Over Lobes, M Drive and Gage Size Number 0.0287 0.0343 0.0367 0.0441 0.0475 0.0156 0.0177 0.0206 0.0223 0.0240 Max. 0.0277 0.0332 0.0357 0.0431 0.0465 0.0146 0.0174 0.0195 0.0215 0.0230 Min. Radius Between Lobes, O 0.0106 0.0121 0.0149 0.0155 0.0179 0.0053 0.0065 0.0076 0.0083 0.0091 Max. 0.0104 0.0119 0.0146 0.0152 0.0176 0.0051 0.0062 0.0074 0.0080 0.0089 Min. Radius of Lobes, P Diameter Over Lobes, M1 0.1333 0.1563 0.1798 0.2018 0.2228 0.0703 0.0828 0.0955 0.1028 0.1123 Max. 0.1330 0.1560 0.1795 0.2015 0.2225 0.0700 0.0825 0.0952 0.1025 0.1120 Min. 0.0961 0.1124 0.1294 0.1449 0.1604 0.0512 0.0602 0.0694 0.0747 0.0815 Width Between Lobes, N1, Max. 0.0266 0.0322 0.0341 0.0416 0.0450 0.0136 0.0160 0.0186 0.0202 0.0219 Radius Between Lobes, O1, Max. Fallaway M1 Fallaway Gage Dimensions C P1 N1 P M GO R O1 O N Dimensions for Type VI Recess Gage Elements GO Gage Dimensions Table VII-1 0.0124 0.0139 0.0172 0.0175 0.0202 0.0071 0.0083 0.0094 0.0098 0.0109 Max. 0.0120 0.0135 0.0168 0.0174 0.0198 0.0067 0.0080 0.0090 0.0097 0.0105 Min. Radius of Lobes, P1 0.1089 0.1293 0.1467 0.1651 0.1837 0.0569 0.0646 0.0758 0.0820 0.0900 Max. 0.1087 0.1291 0.1465 0.1446 0.1835 0.0567 0.0584 0.0756 0.0744 0.0898 Min. Diameter, C NO GO Cylindrical 0.003 0.003 0.003 0.003 0.003 0.001 0.001 0.001 0.001 0.001 Max. Gage Point Radius, R All Elements ASME B18.6.3-2010 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS 0.2633 0.3093 0.3493 0.4433 0.5243 0.6143 0.6943 0.7888 0.8758 70 80 90 100 Not for Resale 0.6137 0.6937 0.7882 0.8752 0.2627 0.3087 0.3487 0.4427 0.5237 0.4370 0.4985 0.5609 0.6234 0.1882 0.2193 0.2512 0.3128 0.3742 0.4364 0.4979 0.5603 0.6228 0.1876 0.2187 0.2506 0.3122 0.3736 Min. Max. Max. Min. Width Between Lobes, N 0.1374 0.1429 0.1764 0.1944 0.0567 0.0712 0.0720 0.1056 0.1140 Max. 0.1364 0.1427 0.1754 0.1934 0.0557 0.0702 0.0710 0.1046 0.1130 Min. Radius Between Lobes, O 0.0471 0.0602 0.0604 0.0679 0.0216 0.0227 0.0306 0.0303 0.0421 Max. 0.0469 0.0600 0.0601 0.0676 0.0214 0.0225 0.0304 0.0301 0.0419 Min. Radius of Lobes, P 0.6213 0.7023 0.7978 0.8848 0.2683 0.3143 0.3543 0.4493 0.5313 Max. 0.6210 0.7020 0.7975 0.8845 0.2680 0.3140 0.3540 0.4490 0.5310 Min. Diameter Over Lobes, M1 0.4440 0.5065 0.5699 0.6324 0.1932 0.2243 0.2562 0.3188 0.3812 Width Between Lobes, N1, Max. 0.1334 0.1389 0.1714 0.1894 0.0537 0.0682 0.0690 0.1020 0.1100 Radius Between Lobes, O1, Max. Fallaway Diameter Over Lobes, M 40 45 50 55 60 Drive and Gage Size Number Fallaway Gage Dimensions GO Dimensions for Type VI Recess Gage Elements (Cont’d) GO Gage Dimensions Table VII-1 0.0509 0.0644 0.0652 0.0727 0.0244 0.0255 0.0334 0.0336 0.0459 Max. 0.0505 0.0640 0.0648 0.0723 0.0240 0.0251 0.0330 0.0332 0.0455 Min. Radius of Lobes, P1 0.5254 0.5876 0.6758 0.7490 0.2207 0.2624 0.2907 0.3805 0.4467 Max. 0.5252 0.5874 0.6756 0.7488 0.2205 0.2622 0.2906 0.3803 0.4465 Min. Diameter, C NO GO Cylindrical 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 Max. Gage Point Radius, R All Elements ASME B18.6.3-2010 94 --`,,```,,,,````-`-`,,`,,`,`,,`--- ASME B18.6.3-2010 NONMANDATORY APPENDIX A DIMENSIONS OF HEADER POINTS FOR MACHINE SCREWS BEFORE THREADING See Table A-1 on following page. 95 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS --`,,```,,,,````-`-`,,`,,`,`,,`--- Not for Resale ASME B18.6.3-2010 Table A-1 Dimensions of Type III Square Fit Gage Points [Note (1)] 45º 40” P L Nominal Size [Note (2)] or Basic Screw Diameter Point Diameter, P Nominal Screw Length, L, Max. [Note (3)] Threads per inch Max. Min. 56 64 0.057 0.060 0.050 0.053 1 40 48 0.074 0.079 0.065 0.070 1 40 44 0.086 0.088 0.076 0.079 1 32 40 0.090 0.098 0.080 0.087 3 8 0.1640 32 36 0.114 0.118 0.102 0.106 1 1 10 0.1900 24 32 0.125 0.138 0.112 0.124 11⁄4 11⁄4 12 0.2160 24 28 0.149 0.156 0.134 0.141 13⁄8 13⁄8 1 ⁄4 0.2500 20 28 0.170 0.187 0.153 0.169 11⁄2 11⁄2 5 ⁄16 0.3125 18 24 0.221 0.237 0.200 0.215 11⁄2 11⁄2 3 ⁄8 0.3750 16 24 0.270 0.295 0.244 0.267 11⁄2 11⁄2 7 ⁄16 0.4375 14 20 0.316 0.342 0.287 0.310 11⁄2 11⁄2 1 13 20 0.367 0.399 0.333 0.362 11⁄2 11⁄2 2 0.0860 4 0.1120 5 0.1250 6 0.1380 ⁄2 0.5000 ⁄2 ⁄2 1 ⁄2 ⁄2 1 ⁄2 ⁄2 1 ⁄4 ⁄4 3 GENERAL NOTE: For additional requirements, refer to section 3. NOTES: (1) Edges of the point may be rounded, and end of the point need not be flat nor perpendicular to the axis of the shank. (2) Where specifying nominal size in decimals, zeros preceding the decimal and in the fourth decimal place shall be omitted. (3) Header points apply to these nominal lengths or shorter. The pointing of longer lengths may require machining to the dimensions specified. 96 --`,,```,,,,````-`-`,,`,,`,`,,`--- Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Not for Resale ASME B18.6.3-2010 NONMANDATORY APPENDIX B DETERMINATION OF MAXIMUM EFFECTIVE DESIGN GRIP LENGTHS are not tabulated, it is necessary to use suitable factors reflecting the maximum point lengths for calculating the maximum effective design grip length. The constants specified in Table B-1 are intended solely to assist the user in this purpose and shall not be subject to inspection. It should be noted that for sems, an additional allowance to provide for the height of the washer must also be considered when determining the maximum effective design grip length. --`,,```,,,,````-`-`,,`,,`,`,,`--- For design reference purposes and selection of proper screw lengths, it is often necessary to determine the maximum effective design grip length [that portion of the screw length extending from the head to the first complete (full form) thread beyond the point taper] on the respective types of tapping screws. For those types of screws having specified point taper lengths, the maximum effective design grip length is determined by deducting the maximum point taper length from the minimum screw length. For Types AB, A, and BP screws having points, the lengths of which 97 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Not for Resale ASME B18.6.3-2010 Table B-1 Constants for Determining Maximum Effective Design Grip Length on Types AB, A, and BP Tapping Screws Z Constant for Point Length Derived From Formula max. minor diam. cot 20° + 1 pitch 2 冢 Derived From Formula max. minor diam. cot 16° + 1 pitch + S max. 2 冣 冢 冣 Nominal Screw Size For Type AB For Type A For Type BP [Note (1)] 0 1 2 3 0.070 0.091 0.119 0.139 0.083 0.101 0.115 0.140 0.105 0.133 0.174 0.202 4 5 6 7 0.160 0.179 0.193 0.211 0.156 0.181 0.195 0.219 0.233 0.264 0.281 0.306 8 10 12 14 0.224 0.256 0.296 ... 0.237 0.266 0.314 0.354 0.324 0.371 0.429 ... 1 ⁄4 16 18 5 ⁄16 0.335 ... ... 0.418 ... 0.371 0.409 ... 0.478 ... ... 0.592 20 24 3 ⁄8 7 ⁄16 1 ⁄2 ... ... 0.508 0.593 0.681 0.432 0.511 ... ... ... ... ... 0.706 0.826 0.938 GENERAL NOTE: Type A not recommended; use Type AB (see paras. 4.1.1.1 and 4.1.1.4). NOTE: (1) Refer to Table 41 for S maximum values applicable to respective sizes. --`,,```,,,,````-`-`,,`,,`,`,,`--- Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS 98 Not for Resale ASME B18.6.3-2010 NONMANDATORY APPENDIX C FORMULAS FOR DIMENSIONS --`,,```,,,,````-`-`,,`,,`,`,,`--- Formulas for the dimensions of head diameter, head height, and slot depth for various types of head screws are provided in Tables C-1 through C-14. Formulas for dimensions of square and hex nuts are provided in Table C-15. 99 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Not for Resale ASME B18.6.3-2010 Table C-1 Flat Countersunk Head Screws Screw Size 0000 through 00 0 through 3⁄8 7 Head Diameter No formulas; see tables Max. A (sharp) p 2.040 D – 0.003 ref. [Note (1)] Min. A (sharp) p 1.960 D – 0.013 ref. [Note (1)] Max. A (rounded or flat) p 1.920 D – 0.003 [Note (2)] Min. A (rounded or flat) p 1.820 D – 0.013 [Note (2)] Gaging diameter G p 1.830 D – 0.033 ⁄16 Max. A (sharp) p 2.000 D – 0.063 ref. [Note (1)] Min. A (sharp) p 1.920 D – 0.073 ref. [Note (1)] Max. A (rounded or flat) p 1.880 D – 0.063 [Note (2)] Min. A (rounded or flat) p 1.800 D – 0.073 [Note (2)] Gaging diameter G p 1.790 D – 0.093 ⁄2 through 3⁄4 Max. A (sharp) p 2.000 D – 0.125 ref. [Note (1)] Min. A (sharp) p 1.920 D – 0.135 ref. [Note (1)] Max. A (rounded or flat) p 1.880 D – 0.125 [Note (2)] Min. A (rounded or flat) p 1.800 D – 0.135 [Note (2)] Gaging diameter G p 1.790 D – 0.155 1 Screw Size 0000 through 00 Head Height Slot Depth No formulas; see tables No formulas; see tables Max. H p 0.619 D – 0.002 Min. H p 0.552 D – 0.007 ref. [Note (1)] Max. T p 0.288 D – 0.002 Min. T p 0.192 D – 0.002 ⁄16 Max. H p 0.596 D – 0.038 Min. H p 0.529 D – 0.042 ref. [Note (1)] Max. T p 0.274 D – 0.017 Min. T p 0.184 D – 0.015 ⁄2 through 3⁄4 Max. H p 0.596 D – 0.075 Min. H p 0.529 D – 0.078 ref. [Note (1)] Max. T p 0.274 D – 0.034 Min. T p 0.184 D – 0.027 0 through 3⁄8 7 1 --`,,```,,,,````-`-`,,`,,`,`,,`--- GENERAL NOTE: D is the basic diameter of the screw. NOTES: (1) Values no longer tabulated; formulas are retained here for reference purposes only. (2) Values based on a sidewall of approximately 21⁄2% of the head diameter. 100 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Not for Resale ASME B18.6.3-2010 Table C-2 Undercut Flat Countersunk Head Screws Screw Size Head Diameter 0 through 3⁄8 Max. A (sharp) p 2.040 D – 0.003 ref. [Note (1)] Min. A (sharp) p 1.960 D – 0.013 ref. [Note (1)] Max. A (rounded or flat) p 1.920 D – 0.003 [Note (2)] Min. A (rounded or flat) p 1.820 D – 0.013 [Note (2)] Gaging diameter G p 1.830 D – 0.033 7 ⁄16 Max. A (sharp) p 2.000 D – 0.063 ref. [Note (1)] Min. A (sharp) p 1.920 D – 0.073 ref. [Note (1)] Max. A (rounded or flat) p 1.880 D – 0.063 [Note (2)] Min. A (rounded or flat) p 1.800 D – 0.073 [Note (2)] Gaging diameter G p 1.790 D – 0.093 1 Max. A (sharp) p 2.000 D – 0.125 ref. [Note (1)] Min. A (sharp) p 1.920 D – 0.135 ref. [Note (1)] Max. A (rounded or flat) p 1.880 D – 0.125 [Note (2)] Min. A (rounded or flat) p 1.800 D – 0.135 [Note (2)] Gaging diameter G p 1.790 D – 0.155 ⁄2 Screw Size Head Height Slot Depth 0 through 3⁄8 Max. H p 0.432 D – 0.001 Min. H p 0.386 D – 0.005 Max. T p 0.202 D – 0.001 Min. T p 0.134 D – 0.001 ⁄18 Max. H p 0.417 D – 0.026 Min. H p 0.370 D – 0.029 Max. T p 0.192 D – 0.012 Min. T p 0.129 D – 0.011 1 Max. H p 0.417 D – 0.052 Min. H p 0.370 D – 0.055 Max. T p 0.192 D – 0.024 Min. T p 0.129 D – 0.019 7 ⁄2 GENERAL NOTE: D is the basic diameter of the screw. NOTES: (1) Values no longer tabulated; formulas are retained here for reference purposes only. (2) Values based on a sidewall of approximately 21⁄2% of the head diameter. Table C-3 100 deg Flat Countersunk Head Screws Screw Size Head Diameter Head Height Slot Depth --`,,```,,,,````-`-`,,`,,`,`,,`--- 0000 through 00 No formulas; see tables No formulas; see tables No formulas; see tables 0 through 3 ⁄8 Max. A (sharp) p 2.040 D – 0.003 ref. [Note (1)] Min. A (sharp) p 1.960 D – 0.013 ref. [Note (1)] Max. A (rounded or flat) p 1.920 D – 0.003 [Note (2)] Min. A (rounded or flat) p 1.800 D – 0.013 [Note (2)] Gaging diameter G p 1.790 D – 0.033 Max. H p 0.444 D – 0.001 Min. H p 0.396 D – 0.005 ref. [Note (1)] Max. T p 0.222 D – 0.0005 Min. T p 0.184 D – 0.004 GENERAL NOTE: D is the basic diameter of the screw. NOTES: (1) Values no longer tabulated; formulas are retained here for reference purposes only. (2) Values based on a sidewall of approximately 21⁄2% of the head diameter. 101 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Not for Resale ASME B18.6.3-2010 Table C-4 Close Tolerance 100 deg Flat Countersunk Head Screws Screw Size Head Diameter Head Height Slot Depth 0 through 5 ⁄8 Max. A (sharp) p 2.040 D − 0.003 ref. [Note (1)] Min. A (sharp) p 2.000 D − 0.009 ref. [Note (1)] Max. A (rounded or flat) p 1.920 D − 0.003 [Note (2)] Min. A (rounded or flat) p 1.800 D − 0.013 [Note (2)] Gaging diameter G p 1.790 D − 0.033 Max. H p 0.444 D − 0.001 Min. H p 0.396 D − 0.005 ref. [Note (1)] Max. T p 0.222 D − 0.0005 Min. T p 0.184 D − 0.004 GENERAL NOTE: D is the basic diameter of the screw. NOTES: (1) Values no longer tabulated; formulas are retained here for reference purposes only. (2) Values based on a sidewall of approximately 21⁄2% of the head diameter. Table C-5 Oval Countersunk Head Screws Screw Size 00 Head Diameter Total Head Height No formulas; see tables No formulas; see tables Max. A (sharp) p 2.040 D − 0.003 ref. [Note (1)] Min. A (sharp) p 1.960 D − 0.013 ref. [Note (1)] Max. A (rounded or flat) p 1.920 D − 0.003 [Note (2)] Min. A (rounded or flat) p 1.820 D − 0.013 [Note (2)] Gaging diameter G p 1.830 D − 0.033 Max. O p 0.923 D + 0.001 Min. O p 0.820 D − 0.008 ⁄16 Max. A (sharp) p 2.000 D − 0.063 ref. [Note (1)] Min. A (sharp) p 1.920 D − 0.073 ref. [Note (1)] Max. A (rounded or flat) p 1.880 D − 0.063 [Note (2)] Min. A (rounded or flat) p 1.800 D − 0.073 [Note (2)] Gaging diameter G p 1.790 D − 0.093 Max. O p 0.896 D − 0.047 Min. O p 0.789 D − 0.050 ⁄2 through 3⁄4 Max. A (sharp) p 2.000 D − 0.125 ref. Min. A (sharp) p 1.920 D − 0.135 ref. Max. A (rounded or flat) p 1.880 D − 0.125 [Note (2)] Min. A (rounded or flat) p 1.800 D − 0.135 [Note (2)] Gaging diameter G p 1.790 D − 0.155 Max. O p 0.896 D − 0.094 Min. O p 0.789 D − 0.094 Screw Size Head Side Height Slot Depth 0 through 3⁄8 --`,,```,,,,````-`-`,,`,,`,`,,`--- 7 1 00 No formulas; see tables No formulas; see tables Max. H p 0.619 D − 0.002 Min. H p 0.552 D − 0.007 ref. [Note (1)] Max. T p 0.556 D − 0.003 Min. T p 0.460 D − 0.003 ⁄16 Max. H p 0.596 D − 0.038 Min. H p 0.529 D − 0.042 ref. [Note (1)] Max. T p 0.547 D − 0.029 Min. T p 0.466 D − 0.030 ⁄2 through 3⁄4 Max. H p 0.596 D − 0.075 Min. H p 0.529 D − 0.078 ref. [Note (1)] Max. T p 0.547 D − 0.057 Min. T p 0.466 D − 0.055 0 through 3⁄8 7 1 GENERAL NOTE: D is the basic diameter of the screw. NOTES: (1) Values no longer tabulated; formulas are retained here for reference purposes only. (2) Values based on a sidewall of approximately 21⁄2% of the head diameter. 102 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Not for Resale ASME B18.6.3-2010 Table C-6 Undercut Oval Countersunk Head Screws (Same as Oval Countersunk Head Except as Shown Below) Screw Size Total Head Height Head Side Height Slot Depth 0 through 3 ⁄8 Max. O p 0.736 D + 0.002 Min. O p 0.654 D − 0.006 Max. H p 0.432 D − 0.001 Min. H p 0.386 D − 0.005 ref. [Note (1)] Max. T p 0.480 D − 0.001 Min. T p 0.402 D − 0.002 ⁄16 Max. O p 0.717 D − 0.035 Min. O p 0.630 D − 0.037 Max. H p 0.417 D − 0.026 Min. H p 0.370 D − 0.029 ref. [Note (1)] Max. T p 0.473 D − 0.023 Min. T p 0.404 D − 0.023 1 Max. O p 0.717 D − 0.071 Min. O p 0.630 D − 0.071 Max. H p 0.417 D − 0.052 Min. H p 0.370 D − 0.055 ref. [Note (1)] Max. T p 0.473 D − 0.033 Min. T p 0.404 D − 0.033 7 ⁄2 GENERAL NOTES: (a) Formulas same as for oval countersunk head except as shown above. (b) D is the basic diameter of the screw. NOTE: (1) Values no longer tabulated; formulas are retained here for reference purposes only. Table C-7 Pan Head Screws Head Height Screw Size 0000 through 00 Head Diameter Slotted Recessed No formulas; see tables No formulas; see tables Max. A p 1.980 D − 0.003 Min. A p 1.940 D − 0.012 Max. H p 0.550 D + 0.006 Min. H p 0.520 D Max. H p 0.692 D + 0.002 Min. H p 0.652 D − 0.003 Max. T p 0.350 D + 0.001 Min. T p 0.300 D − 0.004 1 ⁄4 through 1 ⁄2 Max. A p 1.980 D − 0.003 Min. A p 1.940 D − 0.012 Max. H p 0.550 D + 0.006 Min. H p 0.520 D Max. H p 0.692 D + 0.002 Min. H p 0.652 D − 0.001 Max. T p 0.293 D + 0.014 Min. T p 0.246 D + 0.008 9 ⁄16 through 3 ⁄4 Max. A p 2.100 D − 0.140 Min. A p 2.000 D − 0.125 Max. H p 0.550 D + 0.006 Min. H p 0.520 D Max. H p 0.692 D + 0.002 Min. H p 0.652 D − 0.001 Max. T p 0.293 D + 0.014 Min. T p 0.246 D + 0.008 0 through 12 --`,,```,,,,````-`-`,,`,,`,`,,`--- GENERAL NOTE: D is the basic diameter of the screw. 103 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Not for Resale ... Slot Depth No formulas; see tables ASME B18.6.3-2010 Table C-8 Truss Head Screws Screw Size 0000 through 00 Head Diameter Head Height Slot Depth No formulas; see tables No formulas; see tables No formulas; see tables 0 through 12 Max. A p 2.440 D − 0.015 Min. A p 2.360 D − 0.023 Max. H p 0.620 D Min. H p 0.570 D − 0.005 Max. T p 0.350 D + 0.001 Min. T p 0.300 D − 0.004 1 ⁄4 through 3 ⁄4 Max. A p 2.000 D + 0.073 Min. A p 1.930 D + 0.063 Max. H p 0.520 D + 0.020 Min. H p 0.470 D + 0.015 Max. T p 0.293 D + 0.014 Min. T p 0.246 D + 0.008 GENERAL NOTE: D is the basic diameter of the screw. Table C-9 Fillister Head Screws Screw Size Head Diameter Total Head Height Slot Depth 0000 through 1 No formulas; see tables No formulas; see tables No formulas; see tables 2 through 3 ⁄8 Max. A p 1.670 D − 0.004 Min. A p 1.610 D − 0.014 Max. O p max. H + max. F Min. O p min. H + min. F Max. T p 0.440 D − 0.001 Min. T p 0.374 D − 0.007 ⁄16 Max. A p 1.000 D + 0.188 Min. A p 0.940 D + 0.178 Max. O p max. H + max. F Min. O p min. H + min. F Max. T p 0.500 (min. O) + 0.010 Min. T p max. T − 0.066 D − 0.005 ⁄2 through 3 ⁄4 Max. A p 1.000 D + 0.250 Min. A p 0.940 D + 0.240 Max. O p max. H + max. F Min. O p min. H + min. F Max. T p 0.500 (min. O) + 0.010 Min. T p max. T − 0.066 D − 0.005 7 1 Screw Size Head Side Height Oval Height 0000 through 1 No formulas; see tables No formulas; see tables 2 through 3 ⁄8 Max. H p 0.660 D + 0.005 Min. H p 0.622 D Max. F p 0.280 D − 0.003 Min. F p 0.240 D − 0.008 ⁄16 Max. H p 0.550 D + 0.022 Min. H p 0.510 D + 0.017 Max. F p 0.220 D + 0.006 Min. F p 0.180 D + 0.001 ⁄2 through 3 ⁄4 Max. H p 0.550 D + 0.027 Min. H p 0.510 D + 0.022 Max. F p 0.220 D + 0.008 Min. F p 0.180 D + 0.003 7 1 GENERAL NOTE: D is the basic diameter of the screw. Table C-10 Drilled Fillister Head Screws Screw Size Head Diameter Total Head Height Head Side Height Oval Height 0 through 3 ⁄8 Max. A p 1.670 D − 0.004 Min. A p 1.610 D − 0.014 Max. O p max. H + max. F Min. O p min. H + min. F Max. H p 0.660 D + 0.005 Min. H p 0.645 D Max. F p 0.280 D − 0.003 Min. F p 0.265 D − 0.008 GENERAL NOTE: D is the basic diameter of the screw. 104 --`,,```,,,,````-`-`,,`,,`,`,,`--- Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Not for Resale ASME B18.6.3-2010 Table C-11 Binding Head Screws Screw Size Head Diameter 0000 through 00 No formulas; see tables No formulas; see tables No formulas; see tables 0 through 3 ⁄8 Max. A p 2.100 D Min. A p 1.990 D Max. O p 0.700 D − 0.010 Min. O p 0.665 D − 0.014 Max. F p 0.260 D − 0.004 Min. F p 0.200 D − 0.004 Screw Size Slot Depth 0000 through 00 0 through 3 ⁄8 GENERAL NOTE: Total Head Height Undercut Diameter Oval Height Undercut Depth No formulas; see tables No formulas; see tables No formulas; see tables Max. T p 0.460 D − 0.010 Min. T p 0.390 D − 0.014 Max. U p 1.640 D Min. U p 1.440 D Max. X p 0.100 D + 0.001 Min. X p 0.100 D − 0.004 D is the basic diameter of the screw. Table C-12 Round Head Screws Screw Size Head Diameter 0000 through 00 Head Height Slot Depth No formulas; see tables No formulas; see tables No formulas; see tables Max. A p 1.887 D Min. A p 1.813 D − 0.010 Max. H p 0.645 D + 0.014 Min. H p 0.615 D + 0.006 Max. T p 0.367 D + 0.017 Min. T p 0.277 D + 0.013 ⁄16 Max. A p 2.000 D − 0.125 Min. A p 1.926 D − 0.135 Max. H p 0.875 D − 0.055 Min. H p 0.845 D − 0.063 Max. T p 0.498 D − 0.023 Min. T p 0.380 D − 0.018 1 ⁄2 and 9 ⁄16 Max. A p 2.000 D − 0.188 Min. A p 1.926 D − 0.198 Max. H p 0.875 D − 0.082 Min. H p 0.845 D − 0.090 Max. T p 0.498 D − 0.038 Min. T p 0.380 D − 0.031 5 Max. A p 2.000 D − 0.250 Min. A p 1.926 D − 0.260 Max. H p 0.875 D − 0.109 Min. H p 0.845 D − 0.117 Max. T p 0.498 D − 0.053 Min. T p 0.380 D − 0.043 0 through 3 ⁄8 7 ⁄8 and 3 ⁄4 GENERAL NOTE: D is the basic diameter of the screw. 105 --`,,```,,,,````-`-`,,`,,`,`,,`--- Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Not for Resale 106 Not for Resale Min. O p min. H + F For min. H, use max. shank diameter D, max. angle 82° min. head diameter A, and nominal radius R Nom. R p 0.08 min. A Head Radius Ref. for All Screw Sizes Min. H p Max. H p min. A − D ref. [Note (2)] 2(tan 41°) max. A − D 2(tan 40°) Flat Head Head Height, H, for All Screw Sizes 10 12 12 1 ⁄4 5 ⁄16 1 1 ⁄4 ⁄4 5 ⁄16 5 ⁄16 3 ⁄8 5 6 8 8 10 3 4 4 5 Head Size 8 8 10 12 12 4 5 6 6 Screw Size Flat and Oval Countersunk Trim Head Screws 0.250 0.250 0.3125 0.3125 0.375 0.164 0.164 0.190 0.216 0.216 0.112 0.125 0.138 0.138 Shank Diameter, D, Max. 0.362 0.412 0.412 0.477 0.597 0.237 0.262 0.312 0.312 0.362 0.187 0.212 0.212 0.237 Max. 0.333 0.380 0.380 0.442 0.556 0.215 0.238 0.285 0.285 0.333 0.167 0.191 0.191 0.215 Min. Head Diameter 0.060 0.068 0.068 0.079 0.099 0.041 0.045 0.076 0.076 0.060 0.033 0.037 0.037 0.041 Oval Height, F, Ref. GENERAL NOTES: (a) D is the basic diameter of the screw. (b) Head diameters for head sizes indicated are derived from formulas for flat and oval countersunk head screws shown in Tables C-1 through C-5. Requirements for new head and body combinations should be referred to the subcommittee for development of proper dimensions. NOTES: (1) Dimensions have been determined on large scale layouts using the dimensions specified in the accompanying table in the following manner. (2) Values no longer tabulated; formulas are retained here for reference purposes only. Max. O p max. H + F Total Head Height for All Screw Sizes For max. H, use max. shank diameter D, min. angle 80° max. head diameter A, and nominal radius R. Head Height, H, for All Screw Sizes [Note (1)] --`,,```,,,,````-`-`,,`,,`,`,,`--- Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Oval Head Table C-13 ASME B18.6.3-2010 ASME B18.6.3-2010 Table C-14 Slot Width in Slotted Head Screws Tolerance Screw Size Basic Width 0000 through 00 Screw Size Plus Minus No formula; see tables ... ... ... 0 through 10 Basic slot width p 0.280 D + 0.004 adjusted to standard cutter size 0 and 1 2, 3, 4, and 5 6 and 8 10 0.003 0.003 0.004 0.005 0.004 0.005 0.005 0.006 12 through 3 ⁄4 Basic slot width p 0.160 D + 0.024 adjusted to standard cutter size 12 and 1⁄4 5 ⁄16 3 ⁄8 and 7⁄16 1 ⁄2, 9⁄16, and 5⁄8 3 ⁄4 0.005 0.005 0.005 0.006 0.007 0.006 0.007 0.008 0.009 0.009 GENERAL NOTE: D is the basic diameter of the screw. Table C-15 Machine Screw Nuts Nut Size 0 through 12 1 ⁄4 through 3 ⁄8 Width Across Corners Width Across Flats, Square and Hex Thickness, Square and Hex Square Hex No formulas; see table Max. G p 1.4142 max. F Min. G p 1.373 min. F Max. G p 1.1547 max. F Min. G p 1.14 min. F No formulas; see table Basic F p 1.500 D + 0.062 [Note (1)] Max. F: see table Min. F: see table Max. G p 1.4142 max. F Min. G p 1.373 min. F Max. G p 1.1547 max. F Min. G p 1.14 min. F No formulas; see table GENERAL NOTE: D is the basic diameter of the thread. NOTE: (1) Adjusted to sixteenths of an inch. 107 --`,,```,,,,````-`-`,,`,,`,`,,`--- Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Not for Resale ASME B18.6.3-2010 The approximate hole sizes set forth in Tables D-1 through D-6 are intended to provide general guidance to the user in selecting holes for installing the respective types of thread-forming and thread-cutting tapping screws in various commonly used materials. It should be noted, however, that because conditions and considerations having a bearing upon screw applications differ widely, it may be necessary or desirable to vary the hole from the specified size to best suit a particular application. Refer to para. 4.13 for further explanation of some factors that affect assembly torques. To promote uniformity in terminology and avoid possible misinterpretation, the nomenclature recognized as applicable to holes produced by various methods and the distinguishing features inherent in each are depicted in Figs. D-1 through D-6. Also see Table D-7 for approximate hole sizes for thread-rolling screws. Fig. D-1 Drilled Hole Fig. D-2 Cored Hole Fig. D-3 Punched Hole 108 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Not for Resale --`,,```,,,,````-`-`,,`,,`,`,,`--- NONMANDATORY APPENDIX D APPROXIMATE HOLE SIZES FOR TAPPING SCREWS ASME B18.6.3-2010 Fig. D-4 Hand-Pierced Hole Fig. D-5 Type I Extruded Hole Fig. D-6 Type II Extruded Hole --`,,```,,,,````-`-`,,`,,`,`,,`--- 109 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Not for Resale ASME B18.6.3-2010 Table D-1 Approximate Hole Sizes for Steel Type AB Thread-Forming Tapping Screws In Sheet Metals Steel, Stainless Steel, Monel, Brass Pierced or Extruded Hole Metal Aluminum Alloy Pierced or Extruded Hole Drilled or CleanPunched Hole Drilled or CleanPunched Hole Screw Size Metal Thickness Hole Diameter Hole Diameter [Note (1)] Drill Size No. Hole Diameter Hole Diameter [Note (1)] Drill Size No. 2 0.015 0.018 0.024 0.030 0.036 0.048 0.060 ... ... ... ... ... ... ... 0.064 0.064 0.067 0.070 0.073 0.073 0.076 52 52 51 50 49 49 48 ... ... ... ... ... ... ... ... ... 0.064 0.064 0.064 0.067 0.070 ... ... 52 52 52 51 50 4 0.015 0.018 0.024 0.030 0.036 0.048 0.060 0.075 0.086 0.086 0.098 0.098 0.098 ... ... ... 0.086 0.086 0.089 0.094 0.094 0.096 0.100 0.102 44 44 43 42 42 41 39 38 ... ... 0.086 0.086 0.086 0.086 ... ... ... ... ... 0.086 0.086 0.086 0.089 0.089 ... ... ... 44 44 44 43 43 6 0.015 0.018 0.024 0.030 0.036 0.048 0.060 0.075 0.111 0.111 0.111 0.111 0.111 ... ... ... 0.104 0.104 0.106 0.106 0.110 0.111 0.116 0.130 37 37 36 36 35 34 32 31 ... ... 0.111 0.111 0.111 0.111 ... ... ... ... ... 0.104 0.104 0.104 0.106 0.110 ... ... ... 37 37 37 36 35 7 0.018 0.024 0.030 0.036 0.048 0.060 0.075 0.120 0.120 0.120 0.120 0.120 ... ... 0.116 0.116 0.116 0.116 0.120 0.128 0.136 32 32 32 32 31 30 29 ... 0.120 0.120 0.120 0.120 ... ... ... ... 0.113 0.113 0.116 0.120 0.128 ... ... 33 33 32 31 30 8 0.018 0.024 0.030 0.036 0.048 0.060 0.075 0.136 0.136 0.136 0.136 0.136 ... ... ... 0.125 0.125 0.125 0.128 0.136 0.140 ... 1 ⁄8 1 ⁄8 1 ⁄8 30 29 28 ... 0.136 0.136 0.136 0.136 ... ... ... ... 0.116 0.120 0.128 0.136 0.140 ... ... 32 31 30 29 28 --`,,```,,,,````-`-`,,`,,`,`,,`--- Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS 110 Not for Resale ASME B18.6.3-2010 Table D-1 Approximate Hole Sizes for Steel Type AB Thread-Forming Tapping Screws (Cont’d) In Sheet Metals Steel, Stainless Steel, Monel, Brass (Cont’d) Pierced or Extruded Hole Metal Aluminum Alloy Pierced or Extruded Hole Drilled or CleanPunched Hole Drilled or CleanPunched Hole Screw Size Metal Thickness Hole Diameter Hole Diameter [Note (1)] Drill Size No. Hole Diameter Hole Diameter [Note (1)] Drill Size No. 10 0.018 0.024 0.030 0.036 0.048 0.060 0.075 0.157 0.157 0.157 0.157 0.157 ... ... 0.144 0.144 0.144 0.147 0.149 0.154 0.157 27 27 27 26 25 23 22 ... 0.157 0.157 0.157 0.157 ... ... ... ... ... 0.144 0.144 0.144 0.147 ... ... ... 27 27 27 26 12 0.018 0.024 0.030 0.036 0.048 0.060 0.075 ... 0.185 0.185 0.185 0.185 ... ... ... 0.166 0.166 0.166 0.170 0.177 0.182 ... 19 19 19 18 16 14 ... ... ... ... ... ... ... ... ... ... ... 0.161 0.166 0.173 ... ... ... ... 20 19 17 1 0.018 0.024 0.030 0.036 0.048 0.060 0.075 ... ... 0.209 0.209 0.209 ... ... 0.196 0.196 0.196 0.196 0.205 0.228 0.232 ... ... ... ... ... ... ... ... ... ... ... ... 0.199 0.201 ... ... ... ... ... 8 7 ⁄4 9 9 9 9 W 1 5.9 mm In Plywoods (Resin Impregnated) Compreg, Pregwood, etc. Screw Size Hole Diameter [Note (1)] Drill Size No. 2 4 6 0.073 0.100 0.125 7 8 10 12 1 ⁄4 Penetration in Blind Holes Min. Min. Max. 49 39 1 ⁄8 0.125 0.188 0.188 0.188 0.250 0.250 0.500 0.625 0.625 0.136 0.144 0.173 0.194 29 27 17 10 0.188 0.188 0.250 0.312 0.250 0.250 0.312 0.375 0.750 0.750 1.000 1.000 0.228 1 0.312 0.375 1.000 --`,,```,,,,````-`-`,,`,,`,`,,`--- Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Material Thickness 111 Not for Resale ASME B18.6.3-2010 Table D-1 Approximate Hole Sizes for Steel Type AB Thread-Forming Tapping Screws (Cont’d) In Asbestos Compositions Transite, Ebony Asbestos, etc. Screw Size Hole Diameter [Note (1)] Drill Size No. 2 4 6 0.076 0.101 0.120 7 8 10 12 1 ⁄4 Material Thickness Penetration in Blind Holes Min. Min. Max. 48 38 31 0.125 0.188 0.188 0.188 0.250 0.250 0.500 0.625 0.625 0.136 0.147 0.166 0.196 29 26 19 9 0.250 0.312 0.312 0.312 0.312 0.375 0.375 0.375 0.750 0.750 1.000 1.000 0.228 1 0.438 0.500 1.000 GENERAL NOTE: Because conditions differ widely, it may be necessary to vary the hole size to suit a particular application. See text on first page of this Nonmandatory Appendix. NOTE: (1) Decimals shown represent standard drill sizes rounded to nearest 0.001 in. 112 --`,,```,,,,````-`-`,,`,,`,`,,`--- Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Not for Resale ASME B18.6.3-2010 Table D-2 Approximate Hole Sizes for Steel Types B and BP Thread-Forming Tapping Screws In Sheet Metals Pierced or Extruded Hole Metal Aluminum Alloy Pierced or Extruded Hole Drilled or CleanPunched Hole Drilled or CleanPunched Hole Screw Size Metal Thickness Hole Diameter Hole Diameter [Note (1)] Drill Size No. Hole Diameter Hole Diameter [Note (1)] Drill Size No. 2 0.015 0.018 0.024 0.030 0.036 0.048 0.060 ... ... ... ... ... ... ... 0.064 0.064 0.067 0.070 0.073 0.073 0.076 52 52 51 50 49 49 48 ... ... ... ... ... ... ... ... ... 0.064 0.064 0.064 0.067 0.070 ... ... 52 52 52 51 50 4 0.015 0.018 0.024 0.030 0.036 0.048 0.060 0.075 0.105 0.086 0.086 0.098 0.098 0.098 ... ... ... ... 0.086 0.086 0.089 0.094 0.094 0.096 0.100 0.102 ... 44 44 43 42 42 41 39 38 ... ... ... 0.086 0.086 0.086 0.086 ... ... ... ... ... ... 0.086 0.086 0.086 0.089 0.089 0.094 ... ... ... 44 44 44 43 43 42 6 0.015 0.018 0.024 0.030 0.036 0.048 0.060 0.075 0.105 0.128 to 0.250 0.111 0.111 0.111 0.111 0.111 ... ... ... ... 0.104 0.104 0.106 0.106 0.110 0.111 0.116 0.120 0.128 37 37 36 36 35 34 32 31 30 ... ... 0.111 0.111 0.111 0.111 ... ... ... ... ... ... 0.104 0.104 0.104 0.106 0.110 0.111 ... ... ... 37 37 37 36 35 34 ... ... ... ... 0.120 31 0.018 0.024 0.030 0.036 0.048 0.060 0.075 0.105 0.128 to 0.250 0.120 0.120 0.120 0.120 0.120 ... ... ... 0.116 0.116 0.116 0.116 0.120 0.128 0.136 0.140 32 32 32 32 31 30 29 28 ... 0.120 0.120 0.120 0.120 ... ... ... ... ... 0.113 0.113 0.116 0.120 0.128 0.136 ... ... 33 33 32 31 30 29 ... ... ... ... 0.136 29 0.018 0.024 0.030 0.036 0.048 0.060 0.136 0.136 0.136 0.136 0.136 ... ... 0.125 0.125 0.125 0.128 0.136 ... 1 ⁄8 1 ⁄8 1 ⁄8 30 29 ... 0.136 0.136 0.136 0.136 ... ... ... 0.116 0.120 0.128 0.136 ... ... 32 31 30 29 7 8 113 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Not for Resale --`,,```,,,,````-`-`,,`,,`,`,,`--- Steel, Stainless Steel, Monel, Brass ASME B18.6.3-2010 Table D-2 Approximate Hole Sizes for Steel Types B and BP Thread-Forming Tapping Screws (Cont’d) In Sheet Metals (Cont’d) Steel, Stainless Steel, Monel, Brass Pierced or Extruded Hole Metal Aluminum Alloy Pierced or Extruded Hole Drilled or CleanPunched Hole Drilled or CleanPunched Hole Screw Size Metal Thickness Hole Diameter Hole Diameter [Note (1)] Drill Size No. Hole Diameter Hole Diameter [Note (1)] Drill Size No. 8 0.075 0.105 0.125 0.135 0.162 to 0.375 ... ... ... ... 0.140 0.150 0.150 0.152 28 25 25 24 ... ... ... ... 0.140 0.147 0.147 0.149 28 26 26 25 ... ... ... ... 0.152 24 0.018 0.024 0.030 0.036 0.048 0.060 0.075 0.105 0.125 0.135 0.164 0.200 to 0.375 0.157 0.157 0.157 0.157 0.157 ... ... ... ... ... ... ... 0.144 0.144 0.147 0.152 0.152 0.157 0.161 0.170 0.170 0.173 ... 27 27 26 24 24 22 20 18 18 17 ... 0.157 0.157 0.157 0.157 ... ... ... ... ... ... ... ... ... 0.144 0.144 0.144 0.147 0.147 0.154 0.154 0.159 ... ... ... 27 27 27 26 26 23 23 21 ... ... ... ... 0.166 19 0.024 0.030 0.036 0.048 0.060 0.075 0.105 0.125 0.135 0.164 0.200 to 0.375 0.185 0.185 0.185 0.185 ... ... ... ... ... ... 0.166 0.166 0.166 0.170 0.177 0.182 0.185 0.196 0.196 0.201 19 19 19 18 16 14 13 9 9 7 ... ... ... ... ... ... ... ... ... ... ... ... ... 0.161 0.166 0.173 0.180 0.182 0.182 0.189 ... ... ... 20 19 17 15 14 14 12 ... ... ... ... 0.196 9 0.030 0.036 0.048 0.060 0.075 0.105 0.125 0.135 0.164 0.187 0.194 0.200 to 0.375 0.209 0.209 0.209 ... ... ... ... ... ... ... ... 0.194 0.194 0.194 0.199 0.204 0.209 0.228 0.228 0.234 0.234 0.234 10 10 10 8 6 4 1 1 15 ⁄64 15 ⁄64 15 ⁄64 ... ... ... ... ... ... ... ... ... ... ... ... ... ... 0.199 0.201 0.204 0.209 0.209 0.213 0.213 0.221 ... ... ... 8 7 6 4 4 3 3 2 ... ... ... ... 0.228 1 10 12 1 ⁄4 --`,,```,,,,````-`-`,,`,,`,`,,`--- 114 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Not for Resale ASME B18.6.3-2010 Table D-2 Approximate Hole Sizes for Steel Types B and BP Thread-Forming Tapping Screws (Cont’d) In Plywoods (Resin Impregnated) Compreg, Pregwood, etc. Screw Size Hole Diameter [Note (1)] Drill Size No. 2 4 6 0.073 0.100 0.125 7 8 10 12 1 ⁄4 Material Thickness Penetration in Blind Holes Min. Min. Max. 49 39 1 ⁄8 0.125 0.188 0.188 0.188 0.250 0.250 0.500 0.625 0.625 0.136 0.144 0.173 0.194 29 27 17 10 0.188 0.188 0.250 0.312 0.250 0.250 0.312 0.375 0.750 0.750 1.000 1.000 0.228 1 0.312 0.375 1.000 In Asbestos Compositions Transite, Ebony Asbestos, etc. Screw Size Hole Diameter [Note (1)] Drill Size No. 2 4 6 0.076 0.101 0.120 7 8 10 12 1 ⁄4 Material Thickness Penetration in Blind Holes Min. Min. Max. 48 38 31 0.125 0.188 0.188 0.188 0.250 0.250 0.500 0.625 0.625 0.136 0.147 0.166 0.196 29 26 19 9 0.250 0.312 0.312 0.312 0.312 0.375 0.375 0.375 0.750 0.750 1.000 1.000 0.228 1 0.438 0.500 1.000 --`,,```,,,,````-`-`,,`,,`,`,,`--- In Cast Metals Aluminum, Magnesium, Zinc, Brass, Bronze Screw Size Hole Diameter [Note (1)] Drill Size No. Minimum Penetration in Blind Holes 2 4 6 0.078 0.104 0.128 47 37 30 0.125 0.188 0.250 7 8 10 12 0.144 0.152 0.177 0.199 27 24 16 8 0.250 0.250 0.250 0.281 1 0.234 ⁄4 15 ⁄64 115 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Not for Resale 0.312 ASME B18.6.3-2010 Table D-2 Approximate Hole Sizes for Steel Types B and BP Thread-Forming Tapping Screws (Cont’d) In Plastics Phenol Formaldehyde Plastic Cellulose Acetate, Cellulose Nitrate, Acrylic Resin, and Styrene Resin Drill Size No. Minimum Penetration in Blind Holes Hole Diameter [Note (1)] Drill Size No. Minimum Penetration in Blind Holes 0.078 0.100 0.128 47 39 30 0.188 0.250 0.250 0.078 0.094 0.120 47 42 31 0.188 0.250 0.250 7 8 10 12 0.136 0.150 0.177 0.199 29 25 16 8 0.250 0.312 0.312 0.375 0.128 0.144 0.170 0.191 30 27 18 11 0.250 0.312 0.312 0.375 1 0.234 0.375 0.221 2 0.375 Screw Size Hole Diameter [Note (1)] 2 4 6 ⁄4 15 ⁄64 GENERAL NOTE: Because conditions differ widely, it may be necessary to vary the hole size to suit a particular application. See text on first page of this Nonmandatory Appendix. NOTE: (1) Decimals shown represent standard drill sizes rounded to nearest 0.001 in. --`,,```,,,,````-`-`,,`,,` Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS 116 Not for Resale ASME B18.6.3-2010 Table D-3 Approximate Hole Sizes for Steel Types BF and BT Thread-Cutting Tapping Screws In Cast Metals Die Cast Zinc and Aluminum Screw Size Material Thickness Hole Diameter [Note (1)] Drill Size No. Screw Size Material Thickness Hole Diameter [Note (1)] Drill Size No. 2 0.060 0.083 0.109 0.125 0.140 0.073 0.073 0.076 0.076 0.076 49 49 48 48 48 10 0.125 0.140 0.188 0.250 0.312 0.375 0.166 0.166 0.166 0.170 0.172 0.172 19 19 19 18 11 ⁄64 11 ⁄64 3 0.060 0.083 0.109 0.125 0.140 0.188 0.086 0.086 0.086 0.086 0.089 0.089 44 44 44 44 43 43 12 0.125 0.140 0.188 0.250 0.312 0.375 0.191 0.191 0.191 0.196 0.196 0.196 11 11 11 9 9 9 4 0.109 0.125 0.140 0.188 0.250 0.098 0.100 0.100 0.100 0.102 40 39 39 39 38 1 ⁄4 0.125 0.140 0.188 0.250 0.312 0.375 0.221 0.221 0.221 0.228 0.228 0.228 2 2 2 1 1 1 5 0.109 0.125 0.140 0.188 0.250 0.111 0.111 0.113 0.113 0.116 34 34 33 33 32 5 ⁄16 0.125 0.140 0.188 0.250 0.312 0.375 0.281 0.281 0.281 0.281 0.290 0.290 K K K K L L 6 0.125 0.140 0.188 0.250 0.312 0.120 0.120 0.120 0.125 0.125 31 31 31 1 ⁄8 1 ⁄8 3 0.125 0.140 0.188 0.250 0.312 0.375 0.344 0.344 0.344 0.344 0.348 0.348 0.125 0.140 0.188 0.250 0.312 0.149 0.149 0.149 0.152 0.152 25 25 25 24 24 8 ⁄8 11 ⁄32 ⁄32 11 ⁄32 11 ⁄32 S S 11 In Plastics Phenol Formaldehyde Plastic Screw Size Hole Diameter [Note (1)] 2 3 4 5 6 0.078 0.089 0.104 0.116 0.125 --`,,```,,,,````-`-`,,`,,`,`,,`--- Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Drill Size No. 5 ⁄64 43 37 32 1 ⁄8 Cellulose Acetate, Cellulose Nitrate, Acrylic Resin, and Styrene Resin Min. Max. Hole Diameter [Note (1)] 0.094 0.125 0.125 0.188 0.188 0.250 0.312 0.312 0.375 0.375 0.076 0.089 0.100 0.113 0.120 Depth of Penetration 117 Not for Resale Drill Size No. 48 43 39 33 31 Depth of Penetration Min. Max. 0.094 0.125 0.125 0.188 0.188 0.250 0.312 0.312 0.375 0.375 ASME B18.6.3-2010 Table D-3 Approximate Hole Sizes for Steel Types BF and BT Thread-Cutting Tapping Screws (Cont’d) In Plastics (Cont’d) Phenol Formaldehyde Plastic Cellulose Acetate, Cellulose Nitrate, Acrylic Resin, and Styrene Resin Screw Size Hole Diameter [Note (1)] Drill Size No. Depth of Penetration Min. 8 10 12 1 ⁄4 0.147 0.170 0.194 0.228 26 18 10 1 0.250 0.312 0.375 0.375 Max. Hole Diameter [Note (1)] Drill Size No. Depth of Penetration Min. Max. 0.500 0.625 0.625 0.750 0.144 0.166 0.189 0.221 27 19 12 2 0.250 0.312 0.375 0.375 0.500 0.625 0.625 0.750 GENERAL NOTE: Because conditions vary widely, it may be necessary to change the hole size to suit a particular application. See text on first page of this Nonmandatory Appendix. NOTE: (1) Decimals shown represent standard drill sizes rounded to nearest 0.001 in. --`,,```,,,,````-`-`,,`,,`,`,,`--- Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS 118 Not for Resale ASME B18.6.3-2010 Table D-4 Approximate Hole Sizes for Steel Types D, F, G, and T Thread-Cutting Tapping Screws Metal In Cast Metals Aluminum Alloy Steel Die Cast Zinc and Aluminum Cast Iron Screw Size Threads per Inch Metal Thickness Hole Diameter [Note (1)] Drill Size No. Hole Diameter [Note (1)] Drill Size No. Hole Diameter [Note (1)] Drill Size No. Hole Diameter [Note (1)] Drill Size No. 2 56 0.050 0.060 0.083 0.109 0.125 0.140 0.073 0.073 0.073 0.073 0.076 0.076 49 49 49 49 48 48 0.070 0.073 0.073 0.073 0.073 0.073 50 49 49 49 49 49 0.076 0.076 0.076 0.078 0.078 0.078 48 48 48 5 ⁄64 5 ⁄64 5 ⁄64 0.073 0.073 0.076 0.076 0.076 0.076 49 49 48 48 48 48 3 48 0.050 0.060 0.083 0.109 0.125 0.140 0.187 0.081 0.081 0.082 0.086 0.086 0.086 0.089 46 46 45 44 44 44 43 0.078 0.081 0.082 0.082 0.082 0.086 0.086 5 ⁄64 46 45 45 45 44 44 0.089 0.089 0.089 0.089 0.089 0.094 0.094 43 43 43 43 43 42 42 0.082 0.082 0.082 0.086 0.089 0.089 0.089 45 45 45 44 43 43 43 4 40 0.050 0.060 0.083 0.109 0.125 0.140 0.187 0.089 0.089 0.094 0.096 0.098 0.098 0.102 43 43 42 41 40 40 38 0.089 0.089 0.089 0.094 0.094 0.094 0.098 43 43 43 42 42 3 ⁄32 40 0.100 0.100 0.102 0.102 0.102 0.102 0.104 39 39 38 38 38 38 37 0.096 0.096 0.096 0.096 0.100 0.100 0.100 41 41 41 41 39 39 39 5 40 0.050 0.060 0.083 0.109 0.125 0.140 0.187 0.250 0.106 0.106 0.106 0.106 0.109 0.110 0.116 0.116 36 36 36 36 7 ⁄64 35 32 32 0.102 0.102 0.104 0.104 0.106 0.106 0.110 0.113 38 38 37 37 36 36 35 33 0.111 0.111 0.113 0.113 0.116 0.116 0.116 0.116 34 34 33 33 32 32 32 32 0.106 0.106 0.106 0.110 0.110 0.110 0.111 0.113 36 36 36 35 35 35 34 33 6 32 0.050 0.060 0.083 0.109 0.125 0.140 0.187 0.250 0.110 0.113 0.116 0.116 0.116 0.120 0.125 0.125 35 33 32 32 32 31 1 ⁄8 1 ⁄8 0.109 0.109 0.111 0.113 0.116 0.116 0.120 0.125 7 ⁄64 ⁄64 34 33 32 32 31 1 ⁄8 0.120 0.120 0.125 0.125 0.125 0.125 0.128 0.128 31 31 1 ⁄8 1 ⁄8 1 ⁄8 1 ⁄8 30 30 0.116 0.120 0.120 0.120 0.120 0.120 0.120 0.120 32 31 31 31 31 31 31 31 7 8 32 0.050 0.060 0.083 0.109 0.125 0.140 0.187 0.250 0.312 0.136 0.140 0.140 0.144 0.144 0.147 0.150 0.150 0.150 29 28 28 27 27 26 25 25 25 0.136 0.136 0.136 0.140 0.140 0.144 0.147 0.150 0.150 29 29 29 28 28 27 26 25 25 0.147 0.150 0.150 0.150 0.150 0.150 0.154 0.154 0.154 26 25 25 25 25 25 23 23 23 0.144 0.144 0.144 0.144 0.147 0.147 0.147 0.150 0.150 27 27 27 27 26 26 26 25 25 10 24 0.050 0.060 0.083 0.109 0.125 0.152 0.154 0.161 0.161 0.166 24 23 20 20 19 0.150 0.152 0.154 0.157 0.159 25 24 23 22 21 0.170 0.170 0.172 0.173 0.173 18 18 11 ⁄64 17 17 0.161 0.166 0.166 0.166 0.166 20 19 19 19 19 119 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Not for Resale --`,,```,,,,````-`-`,,`,,`,`,,`--- In Sheet Metals ASME B18.6.3-2010 Table D-4 Approximate Hole Sizes for Steel Types D, F, G, and T Thread-Cutting Tapping Screws (Cont’d) In Sheet Metals (Cont’d) Metal Screw Size Threads per Inch In Cast Metals (Cont’d) Aluminum Alloy Steel Die Cast Zinc and Aluminum Cast Iron Metal Thickness Hole Diameter [Note (1)] Drill Size No. Hole Diameter [Note (1)] Drill Size No. Hole Diameter [Note (1)] Drill Size No. Hole Diameter [Note (1)] Drill Size No. 0.140 0.187 0.250 0.312 0.375 0.170 0.173 0.173 0.173 0.173 18 17 17 17 17 0.161 0.166 0.172 0.173 0.173 20 19 11 ⁄64 17 17 0.173 0.177 0.177 0.177 0.177 17 16 16 16 16 0.166 0.170 0.170 0.172 0.172 19 18 18 11 ⁄64 11 ⁄64 10 32 0.050 0.060 0.083 0.109 0.125 0.140 0.187 0.250 0.312 0.375 0.159 0.166 0.166 0.170 0.170 0.170 0.177 0.177 0.177 0.177 21 19 19 18 18 18 16 16 16 16 0.161 0.161 0.161 0.166 0.166 0.166 0.172 0.177 0.177 0.177 20 20 20 19 19 19 11 ⁄64 16 16 16 0.173 0.173 0.177 0.177 0.177 0.177 0.180 0.180 0.180 0.180 17 17 16 16 16 16 15 15 15 15 0.170 0.170 0.172 0.172 0.172 0.172 0.172 0.173 0.173 0.177 18 18 11 ⁄64 11 ⁄64 11 ⁄64 11 ⁄64 11 ⁄64 17 17 16 12 24 0.060 0.083 0.109 0.125 0.140 0.187 0.250 0.312 0.375 0.500 0.180 0.182 0.188 0.191 0.191 0.199 0.199 0.199 0.199 0.199 15 14 3 ⁄16 11 11 8 8 8 8 8 0.177 0.180 0.182 0.185 0.188 0.191 0.199 0.199 0.199 0.199 16 15 14 13 3 ⁄16 11 8 8 8 8 0.196 0.199 0.199 0.199 0.199 0.203 0.204 0.204 0.204 0.204 9 8 8 8 8 13 ⁄64 6 6 6 6 0.189 0.191 0.191 0.191 0.194 0.194 0.196 0.196 0.199 0.199 12 11 11 11 10 10 9 9 8 8 1 20 0.083 0.109 0.125 0.140 0.187 0.250 0.312 0.375 0.500 0.213 0.219 0.221 0.221 0.228 0.228 0.228 0.228 0.228 3 ⁄32 2 2 1 1 1 1 1 0.206 0.209 0.213 0.213 0.221 0.228 0.228 0.228 0.228 5 4 3 3 2 1 1 1 1 0.228 0.228 0.228 0.228 0.234 0.234 0.234 0.234 0.234 1 1 1 1 15 ⁄64 15 ⁄64 15 ⁄64 15 ⁄64 15 ⁄64 0.219 0.219 0.221 0.221 0.221 0.228 0.228 0.228 0.228 7 0.083 0.109 0.125 0.140 0.187 0.250 0.312 0.375 0.500 0.221 0.228 0.228 0.234 0.234 0.234 0.234 0.234 0.234 2 1 1 A 15 ⁄64 15 ⁄64 15 ⁄64 15 ⁄64 15 ⁄64 0.219 0.221 0.221 0.221 0.228 0.234 0.234 0.234 0.234 ⁄32 2 2 2 1 15 ⁄64 15 ⁄64 15 ⁄64 15 ⁄64 0.234 0.234 0.234 0.234 0.238 0.238 0.238 0.238 0.238 A ⁄64 15 ⁄64 15 ⁄64 B B B B B 0.228 0.228 0.228 0.228 0.228 0.234 0.234 0.234 0.234 1 1 1 1 1 A A 15 ⁄64 15 ⁄64 0.109 0.125 0.140 0.187 0.250 0.312 0.375 0.500 0.277 0.277 0.281 0.290 0.290 0.290 0.290 0.290 J J 9 ⁄32 L L L L L 0.266 0.272 0.272 0.281 0.290 0.290 0.290 0.290 H I I K L L L L 0.290 0.290 0.290 0.295 0.295 0.295 0.295 0.295 L L L M M M M M 0.277 0.281 0.281 0.281 0.281 0.290 0.290 0.290 J K K 9 ⁄32 9 ⁄32 L L L ⁄4 --`,,```,,,,````-`-`,,`,,`,`,,`--- 1 ⁄4 5 ⁄16 28 18 7 7 120 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Not for Resale 15 ⁄32 ⁄32 2 2 2 1 1 1 1 7 ASME B18.6.3-2010 Table D-4 Approximate Hole Sizes for Steel Types D, F, G, and T Thread-Cutting Tapping Screws (Cont’d) In Sheet Metals (Cont’d) Metal Screw Size 5 ⁄16 In Cast Metals (Cont’d) Aluminum Alloy Steel Threads per Inch Metal Thickness Hole Diameter [Note (1)] Drill Size No. Hole Diameter [Note (1)] 24 0.109 0.125 0.140 0.187 0.250 0.312 0.375 0.500 0.290 0.290 0.290 0.295 0.295 0.295 0.295 0.295 L L L M M M M M 0.281 0.281 0.281 0.290 0.295 0.295 0.295 0.295 Die Cast Zinc and Aluminum Cast Iron Drill Size No. Hole Diameter [Note (1)] Drill Size No. Hole Diameter [Note (1)] Drill Size No. K ⁄32 9 ⁄32 L M M M M 0.295 0.295 0.295 0.302 0.302 0.302 0.302 0.302 M M M N N N N N 0.290 0.290 0.290 0.290 0.290 0.295 0.295 0.295 L L L L L M M M 9 3 16 0.125 0.140 0.187 0.250 0.312 0.375 0.500 0.339 0.339 0.348 0.358 0.358 0.358 0.358 R R S T T T T 0.328 0.332 0.339 0.348 0.348 0.348 0.348 21 0.348 0.348 0.348 0.348 0.348 0.348 0.348 S S S S S S S 0.339 0.339 0.339 0.344 0.344 0.348 0.348 R R R 11 ⁄32 11 ⁄32 S S 3 24 0.125 0.140 0.187 0.250 0.312 0.375 0.500 0.348 0.348 0.358 0.358 0.358 0.358 0.358 S S T T T T T 0.344 0.344 0.348 0.358 0.358 0.358 0.358 11 0.358 0.358 0.358 0.358 0.358 0.358 0.358 T T T T T T T 0.348 0.348 0.348 0.358 0.358 0.358 0.358 S S S T T T T ⁄8 ⁄8 ⁄64 Q R S S S S ⁄32 ⁄32 S T T T T 11 In Plastics --`,,```,,,,````-`-`,,`,,`,`,,`--- Phenol Formaldehyde Plastic Screw Size Threads per Inch Hole Diameter [Note (1)] Min. 2 3 4 5 6 56 48 40 40 32 0.078 0.089 0.098 0.113 0.116 5 ⁄64 43 40 33 32 0.219 0.219 0.250 0.250 0.250 8 10 10 1 ⁄4 32 24 32 20 0.144 0.161 0.166 0.228 27 20 19 1 0.312 0.375 0.375 0.375 Drill Size No. Cellulose Acetate, Cellulose Nitrate, Acrylic Resin, and Styrene Resin Max. Hole Diameter [Note (1)] Drill Size No. Min. Max. 0.375 0.375 0.312 0.438 0.312 0.076 0.086 0.093 0.110 0.116 48 44 42 35 32 0.219 0.219 0.250 0.250 0.250 0.375 0.375 0.312 0.438 0.312 0.500 0.500 0.500 0.625 0.144 0.161 0.166 0.228 27 20 19 1 0.312 0.375 0.375 0.375 0.500 0.500 0.500 1.000 Depth of Penetration Depth of Penetration GENERAL NOTE: Because conditions vary widely, it may be necessary to change the hole size to suit a particular application. See text on first page of this Nonmandatory Appendix. NOTE: (1) Decimals shown represent standard drill sizes rounded to nearest 0.001 in. 121 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Not for Resale ASME B18.6.3-2010 Table D-5 Approximate Hole Sizes for Steel Type A Thread-Forming Tapping Screws In Sheet Metals: Steel, Stainless Steel, Monel, Brass, and Aluminum Alloy Pierced or Extruded Hole Drilled or Clean-Punched Hole --`,,```,,,,````-`-`,,`,,`,`,,`--- Screw Size Metal Thickness Hole Diameter Hole Diameter Drill Size No. 4 0.015 0.018 0.024 0.030 0.036 ... ... 0.098 0.098 0.098 0.086 0.086 0.094 0.094 0.098 44 44 42 42 40 6 0.015 0.018 0.024 0.030 0.036 ... ... 0.111 0.111 0.111 0.104 0.104 0.104 0.104 0.106 37 37 37 37 36 7 0.015 0.018 0.024 0.030 0.036 0.048 ... ... 0.120 0.120 0.120 0.120 0.116 0.116 0.116 0.116 0.116 0.120 32 32 32 32 32 31 8 0.018 0.024 0.030 0.036 0.048 ... 0.136 0.136 0.136 0.136 0.125 0.125 0.125 0.125 0.128 1 ⁄8 ⁄8 1 ⁄8 1 ⁄8 30 10 0.018 0.024 0.030 0.036 0.048 ... 0.157 0.157 0.157 0.157 0.136 0.136 0.136 0.136 0.149 29 29 29 29 25 12 0.024 0.030 0.036 0.048 ... 0.185 0.185 0.185 0.161 0.161 0.161 0.161 20 20 20 20 14 0.024 0.030 0.036 0.048 ... 0.209 0.209 0.209 0.185 0.189 0.191 0.196 13 12 11 9 122 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Not for Resale 1 ASME B18.6.3-2010 Table D-5 Approximate Hole Sizes for Steel Type A Thread-Forming Tapping Screws (Cont’d) In Plywoods (Resin Impregnated): Compreg, Pregwood, etc. Hole Diameter [Note (1)] Drill Size No. Material Thickness Min. Min. Max. 4 6 7 0.098 0.110 0.128 40 35 30 0.188 0.188 0.250 0.250 0.250 0.312 0.750 0.750 0.750 8 10 12 14 0.140 0.170 0.189 0.228 28 18 12 1 0.250 0.312 0.312 0.438 0.312 0.375 0.375 0.500 0.750 1.000 1.000 1.000 Screw Size Penetration in Blind Holes In Asbestos Compositions: Transite, Ebony Asbestos, etc. Drill Size No. Material Thickness Screw Size Hole Diameter [Note (1)] Penetration in Blind Holes Min. Min. Max. 4 6 7 0.094 0.106 0.125 42 36 1 ⁄8 0.188 0.188 0.250 0.250 0.250 0.312 0.750 0.750 0.750 8 10 12 14 0.136 0.161 0.185 0.213 29 20 13 3 0.250 0.312 0.312 0.438 0.312 0.375 0.375 0.500 0.750 1.000 1.000 1.000 --`,,```,,,,````-`-`,,`,,`,`,,`--- GENERAL NOTES: (a) Not recommended; use Type AB (see paras. 4.1.1.1 and 4.1.1.4). (b) Because conditions differ widely, it may be necessary to vary the hole size to suit a particular application. See text on first page of this Nonmandatory Appendix. NOTE: (1) Decimals shown represent standard drill sizes rounded to nearest 0.001 in. 123 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Not for Resale ASME B18.6.3-2010 Table D-6 Approximate Hole Sizes in Steel Sheet Metals for Steel Type C Thread-Forming Tapping Screws Screw Size Threads per Inch Metal Thickness Hole Diameter [Note (1)] Drill Size No. 4 40 0.037 0.048 0.062 0.075 0.105 0.134 0.094 0.094 0.096 0.100 0.102 0.102 42 42 41 39 38 38 6 32 0.037 0.048 0.062 0.075 0.105 0.134 0.113 0.116 0.116 0.122 0.125 0.125 33 32 32 3.1 mm 1 ⁄8 1 ⁄8 8 32 0.037 0.048 0.062 0.075 0.105 0.134 0.136 0.144 0.144 0.147 0.150 0.150 29 27 27 26 25 25 10 24 0.037 0.048 0.062 0.075 0.105 0.134 0.154 0.161 0.166 0.170 0.173 0.177 23 20 19 18 17 16 10 32 0.037 0.048 0.062 0.075 0.105 0.134 0.170 0.170 0.170 0.173 0.177 0.177 18 18 18 17 16 16 12 24 0.037 0.048 0.062 0.075 0.105 0.134 0.189 0.194 0.194 0.199 0.199 0.199 12 10 10 8 8 8 1 20 0.037 0.048 0.062 0.075 0.105 0.134 0.221 0.221 0.228 0.234 0.234 0.236 2 2 1 A A 6 mm ⁄4 --`,,```,,,,````-`-`,,`,,`,`,,`--- 124 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Not for Resale ASME B18.6.3-2010 Table D-6 Approximate Hole Sizes in Steel Sheet Metals for Steel Type C Thread-Forming Tapping Screws (Cont’d) Screw Size Threads per Inch Metal Thickness Hole Diameter [Note (1)] Drill Size No. 1 ⁄4 28 0.037 0.048 0.062 0.075 0.105 0.134 0.224 0.228 0.232 0.234 0.238 0.238 5.7 mm 1 5.9 mm A B B 5 ⁄16 18 0.037 0.048 0.062 0.075 0.105 0.134 0.290 0.290 0.290 0.295 0.295 0.295 L L L M M M --`,,```,,,,````-`-`,,`,,`,`,,`--- GENERAL NOTES: (a) Not recommended for new designs (see para. 4.1.1.5). (b) Because conditions differ widely, it may be necessary to vary the hole size to suit a particular application. See text on first page of this Nonmandatory Appendix. NOTE: (1) Decimals shown represent standard drill sizes rounded to nearest 0.001 in. 125 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Not for Resale ASME B18.6.3-2010 Table D-7 Approximate Hole Sizes for Thread Rolling Screws Material Thickness or Length of Engagement Threads per Inch Screw Nominal Diameter Application Material 2 56 56 56 56 56 0.0860 0.0860 0.0860 0.0860 0.0860 Aluminum sheet Steel sheet (HRB 90 max.) Steel sheet (HRB 90 max.) Steel sheet (HRB 90 max.) Zinc die cast 0.187 0.050 0.060 0.095 0.187 3 48 48 48 48 48 0.0990 0.0990 0.0990 0.0990 0.0990 Aluminum sheet Steel sheet (HRB 90 max.) Steel sheet (HRB 90 max.) Steel sheet (HRB 90 max.) Zinc die cast 4 40 40 40 40 40 0.1120 0.1120 0.1120 0.1120 0.1120 5 40 40 40 40 40 6 Screw Size 8 Drilled Hole Diameter Drill Size No. Extruded Hole Diameter Molded or Cast Hole Diameter Hole DraftIncluded Angle ref. ref. ref. ref. min. 0.077 0.075 0.076 0.079 ... ... 9mm #48 #47 ... ... ... ... ... ... ... ... ... ... 0.077 ... ... ... ... 1′–11′ ref. 0.187 0.060 0.095 0.125 0.187 ref. ref. ref. ref. min. 0.088 0.087 0.089 0.090 ... ... 2.2mm #43 #43 ... ... ... ... ... ... ... ... ... ... 0.088 ... ... ... ... 1′–11′ ref. Aluminum sheet Steel sheet (HRB 90 max.) Steel sheet (HRB 90 max.) Steel sheet (HRB 90 max.) Zinc die cast 0.250 0.030 0.060 0.095 0.250 ref. ref. ref. ref. min. 0.099 0.098 0.102 0.102 ... ... 40 2.6mm 2.6mm ... ... ... ... ... ... ... ... ... ... 0.099 ... ... ... ... 1′–11′ ref. 0.1250 0.1250 0.1250 0.1250 0.1250 Aluminum sheet Steel sheet (HRB 90 max.) Steel sheet (HRB 90 max.) Steel sheet (HRB 90 max.) Zinc die cast 0.250 0.060 0.095 0.125 0.250 ref. ref. ref. ref. min. 0.112 0.111 0.113 0.116 ... ... #34 #33 #32 ... ... ... ... ... ... ... ... ... ... 0.112 ... ... ... ... 1′–11′ ref. 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 0.1380 0.1380 0.1380 0.1380 0.1380 0.1380 0.1380 0.1380 0.1380 0.1380 0.1380 0.1380 0.1380 0.1380 0.1380 Aluminum sheet Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Zinc die cast 90 90 90 90 90 90 90 90 90 90 90 90 90 max.) max.) max.) max.) max.) max.) max.) max.) max.) max.) max.) max.) max.) 0.250 0.020 0.030 0.035 0.060 0.090 0.060 0.095 0.125 0.020 0.030 0.035 0.060 0.090 0.250 ref. ref. ref. ref. ref. ref. ref. ref. ref. ref. ref. ref. ref. ref. min. 0.122 ... ... ... ... ... 0.120 0.120 0.125 ... ... ... ... ... ... ... ... ... ... ... ... #31 #31 1 ⁄8 ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... 0.120–0.118 0.121–0.118 0.122–0.119 0.123–0.120 0.125–0.122 ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... 0.122 ... ... ... ... ... ... ... ... ... ... ... ... ... ... 1′–11′ ref. 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 0.1640 0.1640 0.1640 0.1640 0.1640 0.1640 0.1640 0.1640 0.1640 0.1640 0.1640 0.1640 0.1640 0.1640 0.1640 0.1640 0.1640 Aluminum sheet Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Zinc die cast 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 max.) max.) max.) max.) max.) max.) max.) max.) max.) max.) max.) max.) max.) max.) max.) 0.312 0.020 0.030 0.035 0.060 0.090 0.130 0.095 0.125 0.187 0.020 0.030 0.035 0.060 0.090 0.130 0.312 ref. ref. ref. ref. ref. ref. ref. ref. ref. ref. ref. ref. ref. ref. ref. ref. min. 0.148 ... ... ... ... ... ... 0.147 0.150 0.150 ... ... ... ... ... ... ... ... ... ... ... ... ... ... #26 3.8mm 3.8mm ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... 0.146–0.144 0.147–0.144 0.148–0.145 0.149–0.146 0.150–0.147 0.152–0.148 ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... 0.148 ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... 1′–11′ ref. 126 --`,,```,,,,````-`-`,,`,,`,`,,`--- Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Not for Resale ASME B18.6.3-2010 Table D-7 Approximate Hole Sizes for Thread Rolling Screws (Cont’d) Screw Size 10 12 Threads per Inch Screw Nominal Diameter 24 32 24 24 24 24 24 32 24 32 32 32 32 32 24 32 24 32 24 32 24 24 24 24 24 32 24 32 32 32 32 32 24 32 0.1900 0.1900 0.1900 0.1900 0.1900 0.1900 0.1900 0.1900 0.1900 0.1900 0.1900 0.1900 0.1900 0.1900 0.1900 0.1900 0.1900 0.1900 0.1900 0.1900 0.1900 0.1900 0.1900 0.1900 0.1900 0.1900 0.1900 0.1900 0.1900 0.1900 0.1900 0.1900 0.1900 0.1900 Aluminum sheet Aluminum sheet Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Zinc die cast Zinc die cast 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 24 24 24 24 24 24 24 24 24 24 24 24 24 24 24 24 24 24 24 24 24 0.2120 0.2120 0.2120 0.2120 0.2120 0.2120 0.2120 0.2120 0.2120 0.2120 0.2120 0.2120 0.2120 0.2120 0.2120 0.2120 0.2120 0.2120 0.2120 0.2120 0.2120 Aluminum sheet Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Zinc die cast 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 --`,,```,,,,````-`-`,,`,,`,`,,`--- Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Application Material Material Thickness or Length of Engagement Drilled Hole Diameter Drill Size No. Extruded Hole Diameter Molded or Cast Hole Diameter Hole DraftIncluded Angle max.) max.) max.) max.) max.) max.) max.) max.) max.) max.) max.) max.) max.) max.) max.) max.) max.) max.) max.) max.) max.) max.) max.) max.) max.) max.) max.) max.) max.) max.) 0.375 0.375 0.020 0.030 0.035 0.060 0.090 0.020 0.130 0.030 0.035 0.060 0.090 0.130 0.095 0.095 0.125 0.125 0.187 0.187 0.020 0.030 0.035 0.060 0.090 0.020 0.130 0.030 0.035 0.060 0.090 0.130 0.375 0.375 ref. ref. ref. ref. ref. ref. ref. ref. ref. ref. ref. ref. ref. ref. ref. ref. ref. ref. ref. ref. ref. ref. ref. ref. ref. ref. ref. ref. ref. ref. ref. ref. min. min. 0.168 0.174 ... ... ... ... ... ... ... ... ... ... ... ... 0.172 0.173 0.172 0.177 0.172 0.177 ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... 11 ⁄64 #17 11 ⁄64 #16 11 ⁄64 #16 ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... 0.165–0.163 0.166–0.163 0.167–0.164 0.168–0.165 0.170–0.166 0.172–0.170 0.173–0.168 0.173–0.170 0.174–0.171 0.175–0.172 0.176–0.173 0.177–0.174 ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... 0.168 0.174 ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... 1′–11′ ref. 1′–11′ ref. max.) max.) max.) max.) max.) max.) max.) max.) max.) max.) max.) max.) max.) max.) max.) max.) max.) max.) max.) 0.375 0.020 0.030 0.035 0.060 0.090 0.130 0.160 0.187 0.125 0.187 0.250 0.020 0.030 0.035 0.060 0.090 0.130 0.160 0.187 0.375 ref. ref. ref. ref. ref. ref. ref. ref. ref. ref. ref. ref. ref. ref. ref. ref. ref. ref. ref. ref. min. 0.194 ... ... ... ... ... ... ... ... 0.196 0.199 0.203 ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... #9 #8 13 ⁄64 ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... 0.191–0.189 0.192–0.189 0.193–0.190 0.194–0.191 0.196–0.192 0.197–0.193 0.200–0.195 0.203–0.198 ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... 0.194 ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... 1′–11′ ref. 127 Not for Resale ASME B18.6.3-2010 Table D-7 Approximate Hole Sizes for Thread Rolling Screws (Cont’d) Material Thickness or Length of Engagement Threads per Inch Screw Nominal Diameter 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 0.2500 0.2500 0.2500 0.2500 0.2500 0.2500 0.2500 0.2500 0.2500 0.2500 0.2500 0.2500 0.2500 0.2500 0.2500 0.2500 0.2500 0.2500 0.2500 0.2500 0.2500 Aluminum sheet Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Zinc die cast 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 max.) max.) max.) max.) max.) max.) max.) max.) max.) max.) max.) max.) max.) max.) max.) max.) max.) max.) max.) 0.500 0.035 0.060 0.090 0.130 0.160 0.187 0.250 0.250 0.125 0.187 0.250 0.035 0.060 0.090 0.130 0.160 0.187 0.250 0.250 0.500 5 80 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 80 0.3125 0.3125 0.3125 0.3125 0.3125 0.3125 0.3125 0.3125 0.3125 0.3125 0.3125 0.3125 0.3125 0.3125 0.3125 0.3125 0.3125 0.3125 0.3125 Aluminum sheet Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Zinc die cast 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 max.) max.) max.) max.) max.) max.) max.) max.) max.) max.) max.) max.) max.) max.) max.) max.) max.) 3 16 16 16 16 16 16 16 16 16 16 16 16 16 16 16 16 16 0.3750 0.3750 0.3750 0.3750 0.3750 0.3750 0.3750 0.3750 0.3750 0.3750 0.3750 0.3750 0.3750 0.3750 0.3750 0.3750 0.3750 Aluminum sheet Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Zinc die cast 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 max.) max.) max.) max.) max.) max.) max.) max.) max.) max.) max.) max.) max.) max.) max.) Screw Size 1 ⁄4 --`,,```,,,,````-`-`,,`,,`,`,,`--- ⁄16 ⁄8 Application Material Drilled Hole Diameter Drill Size No. Extruded Hole Diameter Molded or Cast Hole Diameter Hole DraftIncluded Angle ref. ref. ref. ref. ref. ref. ref. ref. ref. ref. ref. ref. ref. ref. ref. ref. ref. ref. ref. ref. min. 0.224 ... ... ... ... ... ... ... ... 0.224 0.224 0.228 ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... 5.7mm 5.7mm #1 ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... 0.220–0.218 0.221–0.218 0.223–0.219 0.225–0.221 0.228–0.224 0.231–0.227 0.233–0.229 0.235–0.231 ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... 0.224 ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... 1′–11′ ref. 0.625 0.060 0.090 0.130 0.160 0.187 0.250 0.250 0.187 0.250 0.312 0.060 0.090 0.130 0.160 0.187 0.250 0.250 0.625 ref. ref. ref. ref. ref. ref. ref. ref. ref. ref. ref. ref. ref. ref. ref. ref. ref. ref. min. 0.284 ... ... ... ... ... ... ... 0.281 0.285 0.285 ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... K 7.25mm 7.25mm ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... 0.279–0.277 0.280–0.278 0.281–0.279 0.283–0.280 0.285–0.281 0.288–0.283 0.290–0.285 ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... 0.284 ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... 1′–11′ ref. 0.750 0.130 0.160 0.187 0.250 0.250 0.312 0.250 0.312 0.375 0.130 0.160 0.187 0.250 0.250 0.312 0.750 ref. ref. ref. ref. ref. ref. ref. ref. ref. ref. ref. ref. ref. ref. ref. ref. min. 0.343 ... ... ... ... ... ... 0.348 0.348 0.354 ... ... ... ... ... ... ... ... ... ... ... ... ... ... S S 9mm ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... 0.337–0.335 0.338–0.336 0.340–0.337 0.340–0.339 0.346–0.342 0.349–0.345 ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... 0.343 ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... 1′–11′ ref. 128 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Not for Resale ASME B18.6.3-2010 Material Thickness or Length of Engagement Threads per Inch Screw Nominal Diameter 7 14 14 14 14 14 14 14 14 14 14 14 14 14 14 14 14 14 0.4375 0.4375 0.4375 0.4375 0.4375 0.4375 0.4375 0.4375 0.4375 0.4375 0.4375 0.4375 0.4375 0.4375 0.4375 0.4375 0.4375 Aluminum sheet Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Zinc die cast 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 max.) max.) max.) max.) max.) max.) max.) max.) max.) max.) max.) max.) max.) max.) max.) 0.875 0.160 0.187 0.250 0.250 0.312 0.375 0.312 0.375 0.500 0.160 0.187 0.250 0.250 0.312 0.375 0.875 1 13 13 13 13 13 13 13 13 13 13 13 13 13 13 13 0.5000 0.5000 0.5000 0.5000 0.5000 0.5000 0.5000 0.5000 0.5000 0.5000 0.5000 0.5000 0.5000 0.5000 0.5000 Aluminum sheet Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Steel sheet (HRB Zinc die cast 90 90 90 90 90 90 90 90 90 90 90 90 90 max.) max.) max.) max.) max.) max.) max.) max.) max.) max.) max.) max.) max.) 1.000 0.187 0.250 0.250 0.312 0.375 0.250 0.375 0.500 0.187 0.250 0.250 0.312 0.375 1.000 Screw Size ⁄16 ⁄2 Application Material Drilled Hole Diameter Drill Size No. Extruded Hole Diameter Molded or Cast Hole Diameter Hole DraftIncluded Angle ref. ref. ref. ref. ref. ref. ref. ref. ref. ref. ref. ref. ref. ref. ref. ref. min. 0.400 ... ... ... ... ... ... 0.404 0.406 0.406 ... ... ... ... ... ... ... ... ... ... ... ... ... ... Y 13 ⁄32 13 ⁄32 ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... 0.395–0.392 0.397–0.394 0.400–0.396 0.402–0.398 0.405–0.401 0.409–0.404 ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... 0.400 ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... 1′–11′ ref. ref. ref. ref. ref. ref. ref. ref. ref. ref. ref. ref. ref. ref. ref. min. 0.460 ... ... ... ... ... 0.465 0.469 0.469 ... ... ... ... ... ... ... ... ... ... ... ... 29 ⁄64 15 ⁄32 15 ⁄32 ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... 0.453–0.450 0.455–0.452 0.457–0.454 0.460–0.456 0.464–0.460 ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... 0.460 ... ... ... ... ... ... ... ... ... ... ... ... ... ... 1′–11′ ref. 129 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Not for Resale --`,,```,,,,````-`-`,,`,,`,`,,`--- Table D-7 Approximate Hole Sizes for Thread Rolling Screws (Cont’d) ASME B18.6.3-2010 NONMANDATORY APPENDIX E WRENCH OPENINGS FOR HEX HEAD SCREWS, AND SQUARE AND HEX NUTS Dimensions for wrench openings for hex head screws, and hex and square machine screw nuts are provided in Table E-1. Table E-1 Wrench Openings for Hex Head Screws, Square, and Hex Nuts Allowance Between Product Flats and Jaws of Wrench [Note (2)] Min. Tolerance [Note (2)] Max. Regular Hex Nominal Product Sizes Large Hex Hex Washer Head Screws Hex and Square Machine Screw Nuts Hex Head Screws Wrench Openings 1 ⁄8 ⁄32 3 ⁄16 7 ⁄32 0.1250 0.1562 0.1875 0.2187 0.002 0.002 0.002 0.002 0.127 0.158 0.190 0.220 0.005 0.005 0.005 0.005 0.132 0.163 0.195 0.225 1&2 ... 3, 4, & 5 ... ... ... ... 4 2&3 ... 4&5 ... ... 0&1 2&3 ... 1 0.2500 0.3125 0.3438 0.3750 0.002 0.003 0.003 0.003 0.252 0.316 0.347 0.378 0.005 0.006 0.006 0.006 0.257 0.322 0.353 0.384 6&8 10 & 12 ... 1 ⁄4 5 8 ... 12 6&8 10 & 12 ... 1 ⁄4 4 5&6 8 10 0.4375 0.5000 0.5625 0.6250 0.003 0.004 0.004 0.004 0.440 0.504 0.566 0.629 0.006 0.006 0.007 0.007 0.446 0.510 0.573 0.636 ... 5 ⁄16 3 ⁄8 ... 1 ⁄4 ... ... ... ... 5 ⁄16 3 ⁄8 ... 12 & 1⁄4 ... 5 ⁄16 3 ⁄8 5 ⁄4 ⁄16 11 ⁄32 3 ⁄8 5 7 ⁄16 1 ⁄2 9 ⁄16 5 ⁄8 NOTES: (1) Wrenches shall be marked with the nominal size of wrench, which is equal to the basic (maximum) width across flats of the corresponding screw head or nut. (2) The allowance (minimum clearance) between maximum width across flats of screw head or nut and jaws of wrench equals (0.005 W + 0.001). The tolerance on wrench opening equals plus (0.005 W + 0.004 from minimum). W equals the nominal size of the wrench. 130 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Not for Resale --`,,```,,,,````-`-`,,`,,`,`,,`--- Nominal Size of Wrench; Also Basic (Maximum) Width Across Flats of Screw Head or Nut [Note (1)] B18 AMERICAN NATIONAL STANDARDS FOR BOLTS, NUTS, RIVETS, SCREWS, WASHERS, AND SIMILAR FASTENERS --`,,```,,,,````-`-`,,`,,`,`,,`--- Small Solid Rivets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.1.1-1972 (R2006) Large Rivets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.1.2-1972 (R2006) Metric Small Solid Rivets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B18.1.3M-1983 (R2006) Square, Hex, Heavy Hex, and Askew Head Bolts and Hex, Heavy Hex, Hex Flange, Lobed Head, and Lag Screws (Inch Series) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.2.1-2010 Nuts for General Applications: Machine Screw Nuts, Hex, Square, Hex Flange, and Coupling Nuts (Inch Series) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.2.2-2010 Metric Hex Cap Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.2.3.1M-1999 (R2011) Metric Formed Hex Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.2.3.2M-2005 Metric Heavy Hex Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.2.3.3M-1979 (R2001) Metric Hex Flange Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.2.3.4M-2001 (R2006) Metric Hex Bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.2.3.5M-1979 (R2006) Metric Heavy Hex Bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.2.3.6M-1979 (R2006) Metric Heavy Hex Structural Bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.2.3.7M-1979 (R2006) Metric Heavy Hex Flange Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.2.3.9M-2001 (R2006) Metric Hex Nuts, Style 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.2.4.1M-2002 (R2007) Metric Hex Nuts, Style 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.2.4.2M-2005 (R2010) Metric Slotted Hex Nuts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.2.4.3M-1979 (R2006) Metric Hex Flange Nuts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.2.4.4M-1982 (R2005) Metric Hex Jam Nuts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.2.4.5M-2008 Metric Heavy Hex Nuts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.2.4.6M-2010 Metric Flanged 12-Point Head Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.2.5M-2009 Fasteners for Use in Structural Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.2.6-2010 Metric 12-Spline Flange Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.2.7.1M-2002 (R2007) Clearance Holes for Bolt, Screws, and Studs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.2.8-1999 (R2010) Straightness Gage and Gaging for Bolts and Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.2.9-2010 Socket Cap, Shoulder, and Set Screws, Hex and Spline Keys (Inch Series) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B18.3-2003 (R2008) Socket Head Cap Screws (Metric Series) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B18.3.1M-1986 (R2008) Metric Series Hexagon Keys and Bits. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B18.3.2M-1979 (R2008) Hexagon Socket Head Shoulder Screws (Metric Series) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B18.3.3M-1986 (R2008) Hexagon Socket Button Head Cap Screws (Metric Series) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B18.3.4M-1986 (R2008) Hexagon Socket Flat Countersunk Head Cap Screws (Metric Series) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B18.3.5M-1986 (R2008) Metric Series Socket Set Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B18.3.6M-1986 (R2008) Round Head Bolts (Inch Series) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B18.5-1990 (R2003) Metric Round Head Short Square Neck Bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.5.2.1M-2006 Metric Round Head Square Neck Bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.5.2.2M-1982 (R2010) Wood Screws (Inch Series) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.6.1-1981 (R2008) Slotted Head Cap Screws, Square Head Set Screws, and Slotted Headless Set Screws (Inch Series) . . . . . . . . . . . . . . . B18.6.2-1998 (R2010) Machine Screws, Tapping Screws, and Metallic Drive Screws (Inch Series) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.6.3-2010 Thread Forming and Thread Cutting Tapping Screws and Metallic Drive Screws (Inch Series). . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.6.4-1998 Metric Thread-Forming and Thread-Cutting Tapping Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B18.6.5M-2000 (R2010) Metric Machine Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B18.6.7M-1999 (R2010) Thumb Screws and Wing Screws (Inch Series) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.6.8-2010 Wing Nuts (Inch Series). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.6.9-2010 General Purpose Semi-Tubular Rivets, Full Tubular Rivets, Split Rivets and Rivet Caps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.7-2007 Metric General Purpose Semi-Tubular Rivets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.7.1M-2007 Clevis Pins and Cotter Pins (Inch Series) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.8.1-1994 (R2010) Taper Pins, Dowel Pins, Straight Pins, Grooved Pins, and Spring Pins (Inch Series) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.8.2-2000 (R2010) Spring Pins: Coiled Type, Spring Pins: Slotted, Machine Dowel Pins: Hardened Ground, and Grooved Pins (Metric Series) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.8.100M-2000 (R2010) Cotter Pins, Headless Clevis Pins, and Headed Clevis Pins (Metric Series) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.8.200M-2000 (R2010) Plow Bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.9-2007 Track Bolts and Nuts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B18.10-1982 (R2005) Miniature Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B18.11-1961 (R2010) Glossary of Terms for Mechanical Fasteners . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B18.12-2001 (R2006) Screw and Washer Assemblies — Sems (Inch Series). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B18.13-1996 (R2008) Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Not for Resale Screw and Washer Assemblies: Sems (Metric Series) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.13.1M-1998 (R2003) Forged Eyebolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B18.15-1985 (R2008) Prevailing-Torque Type Steel Metric Hex Nuts and Hex Flange Nuts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.16M-2004 (R2009) Serrated Hex Flange Locknuts 90,000 psi (Inch Series) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.16.4-2008 Nylon Insert Locknuts (Inch Series) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.16.6-2008 Quality Assurance for Fasteners . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.18.2011 Inspection and Quality Assurance for General Purpose Fasteners . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.18.1-2007 Inspection and Quality Assurance for High-Volume Machine Assembly Fasteners . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.18.2-2009 Inspection and Quality Assurance for Special Purpose Fasteners . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.18.3M-1987 (R2005) Inspection and Quality Assurance for Fasteners for Highly Specialized Engineered Applications . . . . . . . . . . . . . . . . B18.18.4M-1987 (R2005) Inspection and Quality Assurance Plan Requiring In-Process Inspection and Controls. . . . . . . . . . . . . . . . . . . . . . . . . B18.18.5M-1998 (R2009) Quality Assurance Plan for Fasteners Produced in a Third Party Accreditation System . . . . . . . . . . . . . . . . . . . . . . . . B18.18.6M-1998 (R2009) Quality Assurance Plan for Fasteners Produced in a Customer Approved Control Plan . . . . . . . . . . . . . . . . . . . . . . . . B18.18.7M-1998 (R2009) Washers: Helical Spring-Lock, Tooth Lock, and Plain Washers (Inch Series) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.21.1-2009 Lock Washers (Metric Series) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.21.2M-1999 (R2005) Double Coil Helical Spring Lock Washers for Wood Structures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.21.3-2008 Metric Plain Washers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.22M-1981 (R2010) Part Identifying Number (PIN) Code System for B18 Fastener Products . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.24-2004 Square and Rectangular Keys and Keyways. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.25.1M-1996 (R2008) Woodruff Keys and Keyways . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.25.2M-1996 (R2008) Square and Rectangular Keys and Keyways: Width Tolerances and Deviations Greater Than Basic Size . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.25.3M-1998 (R2008) Tapered and Reduced Cross Section Retaining Rings (Inch Series) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B18.27-1998 (R2011) Helical Coil Screw Thread Inserts — Free Running and Screw Locking (Inch Series). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.29.1-2010 Helical Coil Screw Thread Inserts: Free Running and Screw Locking (Metric Series) . . . . . . . . . . . . . . . . . . . . . . . . . . B18.29.2M-2005 (R2010) Open-End Blind Rivets With Break Mandrels (Metric Series) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.30.1M-2000 (R2010) Metric Continuous and Double-End Studs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B18.31.1M-2008 Continuous and Double-End Studs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.31.2-2008 Threaded Rods (Inch Series). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.31.3-2009 Threaded Rod (Metric Series) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B18.31.4M-2009 The ASME Publications Catalog shows a complete list of all the Standards published by the Society. For a complimentary catalog, or the latest information about our publications, call 1-800-THE-ASME (1-800-843-2763). --`,,```,,,,````-`-`,,`,,`,`,,`--- Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Not for Resale --`,,```,,,,````-`-`,,`,,`,`, Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS Not for Resale --`,,```,,,,````-`-`,,`,,`,`,,`--- ASME B18.6.3-2010 Copyright ASME International Provided by IHS under license with ASME No reproduction or networking permitted without license from IHS M00410 Not for Resale

ASME / ANSI B16 - Standar Pipes and Fittings Yang ASME B16 Standar mencakup pipa dan alat kelengkapan dalam besi cor, pe

asmeb18.6.4

Standards Manager 6.2 Standards List Number Title A112.4.2 Water Closet Personal Hygiene Devices A112.4.7 Point of Use a

ASME standards info Homepage BPVC ASME Pressure Piping Code Contact ASME Standards - PTC standards ASME PTC 19.10 (1981

I sell all the items in the list of all my documents.Only US $ 150 For information you can send mail to: presiden.engine

asme b18.6.3strength

ASME B18.6.3-2010 [Revision and Consolidation of ASME B18.6.3-2003 (R2008) and B18.6.4-2009] Machine Screws, Tapping S

PDHonline Course M398 (3 PDH) ASME Section I & Section VIII Fundamentals Instructor: Jurandir Primo, PE 2012 PDH Onl

DIREKTORI INOVASI TAHUN 2015 No. Kode Unit Judul Karya Inovasi Kategori Nama 1 1815101 Pusat Pendidikan dan Pelat