MIL-S-62076 Semitrailer Chassis: Intermodal Cargo Container Carrying, Commercial And Container, Cargo: Intermodal, Demountable, CommercialThis specification covers 20 and 40 foot semitrailer chassis and 20 and 40 foot demountable closed cargo containers intermodal type for transporting and storage cargo. The semitrailer chassis and demountable containers may be procured as a combined unit or as individual items to supplement an existing system. The semitrailer chassis are of the tandem axle type and have minimum gross weight ratings of 51,050 pounds for the model A, 20 foot chassis, 74,500 pounds for the model B, 40 foot chassis, and 75,800 pounds for the model C, 40 foot chassis. Items procured under this specification are commercial items which shall be warranted by the manufacturer as specified in procurement documents.

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MIL-S-62076B(AT)

3.2.3.2  Containers.  Model D and E containers shall have the dimensions, weights and ratings specified in table II.

TABLE II.   Container dimensions, weights and ratings.

3.3  Performance.

3.3.1  Semitrailer unit.  The complete semitrailer unit (chassis and container(s)), fully equipped and loaded to its gross weight rating (see 3.2.3.1), shall be capable of being towed at speeds as great as 25 miles per hour (mph) over unimproved roads and over reasonably hard uneven terrain; and being towed at speeds as great as 55 mph over improved roads.

3.3.1.1  Turning ability.  The semitrailer unit shall be capable of assuming a 90 degree turn angle to the coupled towing vehicle without cramping or damaging the semitrailer or the towing vehicle

3.3.1.2  Tracking ability.  The semitrailer chassis, unloaded and loaded as specified, shall conform to the tracking requirements of Federal Motor Carrier Safety Regulation 393.70(a).

3.3.1.3  Brake performance.  The service brakes shall stop the semitrailer-tractor combination, with the semitrailer unit loaded to its gross weight rating, within the stopping distance requirements of Federal Motor Carrier Safety Regulation 393.52.

3.3.2  Containers.  The cargo containers shall meet all dimensional and strength design requirements of ANSI MH5.1.1M-1979.  Certification of conformance to ANSI requirements shall be furnished (see 4.3.3 and 4.3.3.1).

3.4  Semitrailer chassis components.

3.4.1  Frame.  The semitrailer chassis frame shall be the manufacturer's standard all steel frame with longitudinal members supporting the running gear, landing gear and upper fifth wheel plate.  The flanges of the main frame members on straight frame chassis shall be one piece

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