[INCH-POUND]
A-A-52427
February 12, 1993
SUPERSEDES
MS51983E
30 August 1982
COMMERCIAL ITEM DESCRIPTION
NUT, PLAIN, SINGLE BALL SEAT, HEXAGON
WHEEL MOUNTING - 3/4 AND 1-1/8 INCH
The General Services Administration has authorized the use of this commercial item description as a replacement for MS51983E which is canceled.
1.0 Abstract. This commercial item description (CID) covers a hexagon wheel mounting plain, single ball seat nut which is used to mount and secure wheels to the vehicle’s axle and is referred to herein as the nut.
2.0 Salient characteristics.
2.1 Materials. The nut shall be made of carbon steel in accordance with SAB J995-S8 Grade 5, and case hardened to a surface hardness of Rockwell 15N - 85.5 and to a depth of 0.005 to 0.012 inches or alloy steel that is through hardened to produce a core hardness reading of Brinell 223-277 and to a surface hardness of Rockwell 15N-69. 5-84. The surface shall be zinc plated par ASTM B633, Type II, class SC3 (FB/Zn13), except threads which are not fully plated. The use of recovered material made in compliance with regulatory requirements is acceptable providing that all requirements of this CID are met (see 5.5).
2.2 Design and construction. Unless otherwise specified in figure 1, the nut shall be designed and constructed in accordance with SAB J694-88 and shall be capable of sustaining the following proof load requirement without failure or permanent set. The proof loads shall be verified in accordance with SAZ J995-79.
a. 3/4 size nut shall have a minimum proof load test of 37,000 pounds (lbs) of tensile force.
b. 1-1/8 size nut shall have a minimum proof load test of B7, 000 lbs tensile force.
c. The nut shall be removable by hand after load is released.
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Beneficial comments, recommendations, additions, deletions clarifications, etc. and any other data which may improve this document should be sent by letter to: U.S. Army Tank-Automotive Command, ATTN: AMSTA-GDS, Warren, MI 48397-5000. |
DISTRIBUTION STATSMENT A. Approved for public release; distribution is unlimited.
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