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.

Pages 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9 - 10 - 11 - 12 - 13 - 14 - 15 - 16 - 17 - 18

MIL-S-62076B(AT)

may be inside, secured outside by conventional hex nuts, and nuts tightened and tack welded to the bolts. Each hinge pin shall be permanently secured to the hinge butt by cold heading or tack welding the pin in place. Where welding destroys protective plating or hardware items, the weld and surrounding area shall be thoroughly cleaned and primed with one coat of zinc chromate and at least one coat of finish paint with a dry film thickness of not less than 1.5 mils. All locking device handles shall be furnished with provisions for padlocking.

3.5.1.6 Container corner fittings. The container corner fittings shall conform to

ANSI MH5.1.1M-1979.

3.5.1.6.1 Container corner fitting securement devices. When specified (see 6.2), four securement devices shall be furnished for securing together containers which are stacked for storage or transport. Securement devices shall be either stacking and locking cone type or stacking and pin locking type.

3.5.2 Document holders. Weatherproof documentation pockets or boxes shall be provided on both the inside and outside of the right rear door of each container. The inside box or pocket shall be designed to hold a package of electric adding machine (EAM) cards, approximately

3/4 inch thick, and the service or operator's manual. The outer box or pocket shall provide visual

access to the Government Bills of Lading (GBL's) and other shipping documents without their removal. The approximate size of each box or pocket shall be 9 by 12 inches.

3.6 Stress analysis. The contractor shall furnish a stress analysis of his proposed semitrailer chassis construction. This analysis shall include at least the calculations and diagrams required herein.

(a) The sprung load distribution diagram with the vehicle loaded to its gross weight rating. (b) The vertical shear diagram for the length of the chassis.

(d) The loads, sections, and stresses in members that carry maximum shear and moment, to include the analysis of the stresses in attaching weldments or other fastenings.

(e) The loads, sections, shear, and bending moment diagram at kingpin and rear underconstruction subframe members.

(f) The load, section, shear, and bending moment diagram for the most critical crossmember, to include the analysis of stresses in attaching weldments or other

fastenings.

(g) The loads, sections, and stresses in members that carry maximum compression.