INCH-POUND
A-A-52531
November 27, 1995
SUPERSEDING
MS53038E
9 October 1987
COMMERCIAL ITEM DESCRIPTION
KINGPIN, FIFTH WHEEL, 2 INCH AND 3.5 INCH, UNIVERSAL
The General Services Administration has authorized the use of this commercial item
description (CID) for all federal agencies.
1. SCOPE. This CID covers the requirements for a universal kingpin used in coupling military
trailer to a truck-tractor or a trailer converter dolly fifth wheel. It also includes the requirements
for kingpins used in trailers when transported on flat cars.
2. SALIENT CHARACTERISTICS.
2.1 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
3.1).
2.2 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 443-512 BHN at the surface.
2.3 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 and SAE
J848.
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
and Armaments Command, ATTN: AMSTA-TR-E/BLUE, Warren, MI 48397-5000.
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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