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)

without splices or joints. Where frame members are spliced on gooseneck chassis, joints shall be reinforced to fulfill the dynamic loading requirements of 3.3.1. Splices shall be designed to

avoid stress concentration. Splice welds shall be continuous. The frame shall support the weight

of the fully loaded container(s) specified in table II. Model A, B and C semitrailer chassis shall have the dimensions and clearances specified in table III. Container-chassis interface shall be in accordance with ANSI MH5.6-1978.

TABLE III. Semitrailer chassis dimensions and clearances.

Description

Model A

Model B

Model C

Ground clearance (minimum), inches

Upper fifth wheel height, from ground to

underside of upper fifth wheel plate, inches, plus or minus one inch

Distance from vertical centerline of kingpin to front end of semitrailer (minimum), inches

Swing radius from vertical centerline of kingpin to most difficult point of semitrailer nose

(maximum), inches

3.4.1.1 Bolsters. The semitrailer chassis frame shall include full-width, steel front and rear bolsters. Model C semitrailer chassis shall, in addition, include a mid-center, full-width, steel bolster. Rear bolsters may serve as rear crossmembers. Twist lock and pin lock devices specified in 3.4.1.2 shall be installed at the bolster ends. Bolsters shall be reinforced as necessary in accordance with manufacturer's standard commercial practice.

3.4.1.2 Locking devices. The semitrailer chassis shall be equipped with twist-lock devices on the frame bolsters to engage and secure the lower corner fittings of the container(s). Model A and B chassis shall be provided with four twist-lock devices, one at each corner of the frame

front and rear bolsters, or with two pin-lock devices on the front bolster of the frame and with two twist-lock devices on the rear bolster of the frame. Model C chassis shall be provided with four twist-lock devices, one at each corner of the frame front and rear bolsters and with four retractable twist-lock devices at the mid-center bolster for securing two 20 foot containers. The locking devices shall be designed to preclude unintentional release. The locking devices and their locations shall be in accordance with ANSI MH5.6-1978, and the devices shall meet the requirements of Federal Motor Carrier Safety Regulation 393.100(e).