Doubleshieldedbearing

R 231622Z DEC 24 MARADMIN 628/24 MSGID/GENADMIN/CG TECOM QUANTICO VA// SUBJ/MODIFICATION TO THE FY2025 REGIONAL SNCO ACADEMY CLASS SCHEDULES FOR ACTIVE DUTY AND RESERVE COMPONENT// REF/A/MARADMIN 400/23// REF/B/MARADMIN 627/24// REF/C/MARADMIN 270/24// REF/D/MARADMIN 272/24// NARR/REF A IS THE ANNOUNCEMENT OF THE FISCAL YEAR 2024 CLASS DATES FOR THE REGIONAL STAFF NONCOMMISSIONED OFFICER ACADEMIES. REF B IS THE STAFF NON-COMMISSIONED OFFICER LEADERSHIP SCHOOL MARADMIN. REF C ANNOUNCEMENT OF THE FISCAL YEAR 2025 CLASS DATES FOR THE REGIONAL STAFF NONCOMMISSIONED OFFICER ACADEMIES. REF D ANNOUNCEMENT OF THE  FISCAL YEAR 2025 RESERVE COMPONENT CLASS DATES FOR THE REGIONAL STAFF NONCOMMISSIONED OFFICER ACADEMIES. POC/OPERATIONS CHIEF/CEME, MCU/LOC: QUANTICO/TEL: (703) 432-5283/ EMAIL: MCU_CEME@USMCU.EDU// GENTEXT/REMARKS/1. This message announces the cancellation of classes for Active Duty and the Reserve Component Career and Advanced Schools at the Regional Academies. Also, it announces the school  dates for the Staff Non-Commissioned Officer Leadership School. The  school dates are posted on the College of Enlisted Military Education (CEME) website: https:(slash)(slash)www.usmcu.edu/ceme 2. Canceled Active Duty Career and Advanced Classes 2.A. Quantico Academy Career School (M02T8A5): 2025QC3 / 2025QC5 Advanced School (M02T8H5): 2025QA4 / 2025QA5 2.B. Lejeune Academy Career School (M03T8A5): 2025LC3 / 2025LC4 / 2025LC5 Advanced School (M03T8H5): 2025LA4 / 2025LA5 2.C. Pendleton Academy Career School (M10T8A6): 2025PC3 / 2025PC4 / 2025PC5 Advanced School (M10T8H6): 2025PA4 / 2025PA5 2.D. Okinawa Academy Career School (M22T8A1): 2025OC3 / 2025OC4 / 2025OC5 Advanced School (M22T8H1): 2025OA4 / 2025OA5 3. Canceled Reserve Component Career and Advanced Classes 3.A. Quantico Academy Career School (M02CEW5): 2025RC2 / 2025RC3 Advanced School (M02M4L5): 2025RA2 4.  Staff Non-Commissioned Officer Leadership School Dates 4.A. Class dates for Marine Corps Base (MCB) Quantico, VA (M0231Q5): Class Report Date Convene Date Grad Date 2025Q 1 (Pilot) 21 Apr 25 22 Apr 25 10 Jun 25 2025Q 2 05 Aug 25 06 Aug 25 24 Sep 25 4.B. Class dates for MCB Camp Lejeune, NC (M0331Q5): 2025L 2 23 Jul 25 24 Jul 25 10 Sep 25 4.C. Class dates for MCB Camp Pendleton, CA (M1031Q6): 2025P 2 23 Jul 25 24 Jul 25 10 Sep 25 4.D. Class dates for Camp Hansen, Okinawa, Japan (M2231Q1): 2025O 2 23 Jul 25 24 Jul 25 10 Sep 25 5. Reserve Staff Non-Commissioned Officer Leadership School Dates 5.A. Class dates for Marine Corps Base (MCB) Quantico, VA (M02R2V5): Class Report Date Convene Date Grad Date 2025R 1 14 Jun 25 14 Jun 25 28 Jun 25 2025R 2 12 Jul 25 12 Jul 25 26 Jul 25 6. All class dates should be verified through the Marine Corps Training Information Management System (MCTIMS). Class dates may be changed throughout the FY for various reasons. MCTIMS is the guiding system that will have the current class schedule. MCTIMS remains up to date and supersedes this MARADMIN and all other academic calendars that list FY25 Staff Noncommissioned Officer Academy School Dates. 7. For information on; registration instructions, resident school prerequisites, duty status waiver requests, reporting instructions, fitness reports, sister service student registration, post-graduation senior leader feedback, and seat allocations please use REF/C/MARADMIN 270/24 for Active duty and Active Reserve, and REF/D/MARADMIN 272/24 for Selected Marine Corps Reserve, Individual Mobilization Augmentee, and Individual Ready Reserve.  8. Release authorized by Brigadier General Matthew W. Tracy, Commanding General, Education Command.//

Ball bearings are available with and without enclosures. Richard Picard, field applications engineer at NMB Technologies Corporation explains that compared to open bearings, shielded and sealed bearings provide better protection from contamination and also add protection against lubrication migration.

Sealed bearings vsgreasablebearings

“However, while contact seals provide better protection against contamination there is an increase in rotational torque due to friction between the seal lip and bearing inner ring. Sealing performance is a trade-off between protection and torque,” Picard warns.

Rubber sealvsmetal seal bearing

Both non-contact seals and shields allow reduced rotational torque as there is no contact to the inner ring. However, non-contact enclosures generally provide less protection against contamination, as compared to contact seals.

Picard concludes that it is critical to consult with a bearing application engineer in selecting the appropriate enclosure for your application to ensure the correct choice.

Seals are constructed from various elastomeric materials. The type of seal material selected can depend on factors such as application temperature and compatibility with other adjacent substances.

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Sealed bearings

“The selection of a shield or seal is dependent on the bearing application and environment,” said Picard. “Shields are metallic and there is no contact between the shield bore and the bearing inner ring. Metallic shields are the most common and affordable type of bearing enclosure.”

“Seals can be either non-contact or contact by design. With a non-contact seal, similar to a shield, there is no contact to the bearing inner ring. A contact seal is designed to contact the bearing inner ring with the lip of the seal,” he said.

Doshielded bearingsneed to be greased

The selection of shields is dependent on the application and environment. Depending on the environment, shield/seal designs are offered with varying degrees of contamination resistance and torque (friction) characteristics. The seal lip can be further optimized by selecting either “standard” contact or “light” seal lip design which is dependent on torque and contamination conditions.

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