A193B7

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This specification covers anchor bolts that are designed for anchoring structural supports to concrete foundations. Bolts under this specification can conform to a headed bolt, straight rod or bent anchor bolt configuration. There are three grades within this specification, 36, 55, or 105.  These grade numbers represent the minimum yield strength (ksi) requirement of the anchor bolt. The bolts are color coded at the end that will project from the concrete to easily identify the grade used in the field (Grade 36: Blue, Grade 55: Yellow, Grade 105: Red). Permanent stamping with grade symbol and manufacturer’s identifier instead of color coding is a supplementary requirement.

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The J429 specification covers requirements for fasteners used for automotive purposes, OEM applications, and other related industries. There are three common grades (2, 5 and 8) that readily available or can be made as fully threaded rods. There are ASTM specifications that have similar strength properties which may be easier to find in the form of all thread rod than their SAE equivalent. SAE threaded rods do not require permanent grade markings on the ends of the rods like many ASTM specifications do. Common finishes include plain black, zinc plated, and hot-dip galvanized for Grades 2 and 5. Grade 8 is typically provided plain finish only due to the potential risk of hydrogen embrittlement when plated or galvanized.

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This low-carbon, mild steel bolt specification covers heavy hex bolts and fully threaded studs that are intended for cast iron flanged joints in piping systems with cast iron flanges. A307 Grade B differs from A307 Grade A in that it has a maximum tensile strength requirement. Common finishes include plain black, zinc, and hot-dip galvanized. One end of each rod requires a permanent grade symbol and manufacturer’s identifier.

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Stainless steel all thread rod is common in the maketplace and is sold under several different ASTM specifications. The two most common forms of stainless all thread rod are bought and sold simply as AISI Type 304 or Type 316 stainless steel. However, stainless steel all thread rod is often specified under a variety of ASTM specifications including A193, A320, and F593.  The type of stainless steel desired for the project will be specified as a grade within the A193 and A320 specifications or as a alloy group and condition within the F593 specification.

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This specification is designed for rods being used in low temperature applications. It is made from medium-carbon, alloy steel which undergoes a heat-treating process to reach the required strength properties and requires a Charpy impact test to ensure its performance at low temperatures. Common finishes are plain black and hot-dip galvanized. One end of each rod requires a permanent grade symbol and manufacturer’s identifier stamp. Please note that rods above 1” in diameter require 8 threads per inch (tpi) unless otherwise specified.

This specification is manufactured from low-carbon mild steel and  covers your everyday, run of the mill bolts. Stock finishes include plain black, zinc plated, and hot-dip galvanized. One end of each rod requires a permanent grade symbol and manufacturer’s identifier, however this requirement is largely ignored due to their implementation in noncritical applications and the fact that they are often cut to length in the field.

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The A449 specification is a high strength grade manufactured from a medium carbon or alloy steel which undergoes a heat-treating process to develop its strength. It is intended for general engineering applications.

This specification covers quenched and tempered alloy steel bolts, studs and other fasteners 4” in diameter and under. This is a high-strength specification that does not have configuration limitations and is used for general applications.  Common finishes are plain black and hot-dip galvanized. One end of each rod requires a permanent grade symbol and manufacturer’s identifier.

Many engineers incorrectly specify A325 all thread rod, which is not a proper specification due to fact that A325 requires a forged head. ASTM A449 is virtually identical in chemistry and strength to the ASTM A325 specification in diameters 1/2″ – 1″; however, A449 is more flexible considering it is not restricted to a specific configuration. If you have a project with A325 all thread rod specified, have the engineer of record consider moving to an A449 grade instead for diameters 1″ and less. Common finishes are plain black and hot-dip galvanized. One end of each rod requires a permanent grade symbol and manufacturer’s identifier.

This grade covers medium carbon, alloy steel that has been quenched and tempered to reach its high strength requirements.  It is virtually identical to the A490 specification in chemical and mechanical properties; however, it does not have the configuration limitations that A490 has.  If you have a project with A490 all thread rod specified, you should ask the Engineer of Record to consider A354 Grade BD in its place. A354 Grade BD is higher in strength than the other grades listed on this page and is subject to the risk of hydrogen embrittlement when plated or galvanized.  One end of each rod requires a permanent grade symbol and manufacturer’s identifier.

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Kailey Tillman, Sales Representative at Portland Bolt, is an expert on all thread rod. Contact Kailey by phone, through our form, by email, or via chat if you have any questions.

ASTM A36 is a steel grade, not a fastener specification. Technically, all thread rod made from A36 steel should be ordered to a fastener specification such as A307 Grade A, A307 Grade B, F1554 Grade 36, or SAE J429 Grade 2. The appropriate fastener specification will depend on the application. However, some companies stock all thread rod manufactured from A36 steel and can certify it as such upon request.

ASTM A193

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This specification is the other primary grade of all thread rod that is mass produced and readily available off the shelf. It is made from a medium-carbon, alloy steel that has been quenched and tempered to reach its higher strength. This grade of all thread is designed for high temperature or high pressure applications and intended for use in flanges, valves, pressure vessels and fittings.

It is important to note that in this specification, the threading standard for rods above 1” in diameter is 8 threads per inch (tpi). However, B7 threaded rod with Unified National Coarse (UNC) threads is also readily available. Both threading options are stock items so make sure to double check which thread pattern you need for your application. Common finishes are plain black and hot-dip galvanized. One end of each rod requires a permanent grade symbol and manufacturer’s identifier.