INCH-POUND
A-A-52414B
28 August 2012
SUPERSEDING
A-A-52414A
2 August 2005
COMMERCIAL ITEM DESCRIPTION
BEARING, ROLLER, THRUST
The General Services Administration has authorized the use of this commercial item
description (CID) as a replacement for MIL-B-17380A and MS17103A which are
canceled.
1. SCOPE. This CID covers thrust roller bearings consisting of two flat thrust plates, cylindrical
rollers, and a retainer (see figure 1). They are used where the shaft axis is parallel to the load.
2. SALIENT CHARACTERISTICS
2.1 Materials. Thrust plates and rollers shall be made of vacuum degassed bearing quality steel
and have a hardness of RC 58-60 for the thrust plates and RC 60-64 for the rollers. The retainer
shall be made of cast bronze or brass and provided with a hardened steel band to resist the
outward thrust of the rollers. The use of recovered materials made in compliance with regulatory
requirements is acceptable providing that all requirements of this CID are met (see 3).
2.2 Design and construction. The general design and construction features of roller thrust
bearings are shown in figure 1. The rollers shall be crowned and their lengths shall alternate
from short to long in successive slots around the body of the retainer. The flat faces of each
thrust plate shall be parallel within 1 mil. The roller diameters shall be uniform to within
0.25 mils. The difference in diameter between the rollers in any one bearing assembly shall not
exceed 0.25 mils. The rollers shall remain in the retainer when the bearings are disassembled.
Detailed and specific features and dimensions shall be specified in an engineering drawing
(see 6.1).
Beneficial comments, recommendations, additions, deletions, clarifications, etc. and any data that
may improve this document should be sent to
usarmy.detroit.rdecom.mbx.tardec-standardization@mail.mil or U.S. Army RDECOM, Tank
Automotive Research, Development and Engineering Center,
ATTN: RDTA-EN/STND/TRANS MS #268, 6501 E. 11 Mile Road, Warren, MI 48397-5000.
Since contact information can change, you may want to verify the currency of this address
information using the ASSIST Online database at https://assist.dla.mil.
AMSC N/A
FSC 3110
DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited.
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