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|  MIL-T-62531(AT)
APPENDIX A
anticipated and considered with the leg of the lifting or tiedown device acting at an angle of 45
from the vehicle. The working stress upon which the design of all lugs and eyes should be based
on the maximum combined stress that is developed in the lug or eye by the application of the
working load. The ratio of the ultimate stress of the material used for the lugs or eyes to the
working stress (factor of safety) should be a minimum of 5.
3.16.2 Pintle. A towing pintle at the rear of the vehicle shall be provided. The pintle
assembly shall be of the swivel type and conform to the size and strength described in
Drawing ______. The assembly shall be furnished with mounting flanges and lubrication fitting.
The pintle assembly mounting surface shall be not more than ______ mm forward of the rear
most part of the vehicle. The mounting of the pintle assembly shall include reinforcements to
transfer pintle loads directly to the web of the chassis frame. Provision for attachment of trailer
safety chains shall be provided. Pintle height shall be ______ mm.
Rationale
Insert the pintle drawing number in the first blank space, the distance of the mounting surface
in the rear in the second blank and the pintle height in the third space. A pintle assembly is a
towing hook equipped with a hinged latch across its opening to retain the eye of a tow bar.
Verification Rationale
Most pintle assemblies are of a rotatable type, i.e., they are made to swivel about their
longitudinal axis. Some vehicles are generally equipped with nonrotatable pintle assemblies to
meet a definite military requirement to prevent small, narrow-tread, towed loads from
overturning in rough cross-country operations. Pintle assemblies are normally mounted at the
center of the rear end of the vehicle in a manner that will transfer the towed load directly to the
vehicle frame. The pintle height should be compatible with the height of the towing lugs or
lunettes of the vehicle to be towed. Pintles should be positioned to allow the most favorable
draw line for towing trailers and other vehicles. The mounting must be sufficiently strong to
withstand the shock loads associated with start up and with operations over rough terrain. The
pintle location should be free of interferring brackets, braces, or body structure that can hamper
coupling or uncoupling operations or limit relative motions between the towing and towed
vehicles.
3.16.3 Tiedowns. Complete diagrams and instructions for lifting and tying down the vehicle
for the various transport modes shall be provided. Instructions shall be included for complete
removal when required for transport. Stencil or decal markings shall be applied to the vehicle at
each lifting and tiedown point conforming to MIL-STD-209. The tiedowns shall permit tiedown
of the vehicle to the floor (or deck) of the transport medium in such a manner as to prevent
shifting or movement in any direction.
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