INCH-POUND
A-A-52478
October 21, 1993
SUPERSEDING
MS53036D
26 March 1979
COMMERCIAL ITEM DESCRIPTION
KINGPIN, FIFTH WHEEL, 2 INCH
The General Services Administration has authorized the use of this commercial
item description (CID) as a replacement for MS53036D, which is cancelled.
ABSTRACT
This CID covers requirements for a 2 inch fifth wheel kingpin used in coupling military
trailer to a truck-tractor or trailer converter dolly fifth wheel. It also includes the requirements for
trailers transported on flat car.
SALIENT CHARACTERISTICS
a. Materials. Unless otherwise specified herein, the materials used shall be in accordance
with manufacturer's specifications/drawings. The use of recovered materials made in compliance
with regulatory requirements is acceptable providing that all requirements of this CID are met
(see note e).
1. Steel forging. The kingpins shall be made of steel forgings of carbon content
0.35% max. with sufficient alloy content to be oil quenched and tempered to 302-363 BHN at the
surface.
b. Design and construction. Unless otherwise specified herein (see figure 1), the kingpin
shall be designed and constructed to the form and dimensions in accordance with SAE J700.
c. Performance. When properly installed, the kingpin shall meet the performance
requirements in accordance with SAE J133. When transported on a flat car, the kingpin shall
withstand force of 3.5 GVW and shall be in accordance with other requirements specified in
Association of American Railroads specification M931.
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.
AMSC N/A
FSC 2510
DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited.
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
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