MIL-W-52125B
3.14.3.1 Wheels. The wheels shall be 15-inch, 3- or 6-spoke. Malleable iron wheels shall be of material conforming to SAE 35018, grade A. Cast steel wheels shall be of material conforming to SAE 0030. Rim clamps shall be malleable iron conforming to SAE 35018, grade A. Studs and bolts shall be in accordance with SAE J429, grade 5 or 6, with a minimum tensile strength of 120,000 psi.
3.14.3.2 Rims and brake drums. The rims shall be size 15 by 7.5, 5-degree, three piece type for tube-type tires, and shall accommodate the tires specified in 3.14.3.3. Rims shall conform to the Tire and Rim Association Yearbook. The semitrailer shall be furnished with one spare rim without tire. The location of the assembly shall permit removal and replacement of a spare tire by not more than two men. The spare tire and rim assembly shall not come loose, be damaged, or interfere with any component of the unit during travel or operation. The brake drums shall have a wearing surface of SAE J431 automotive gray cast iron, SAE G3500 or SAE G4000, and shall be of the anti-bell mouth type. The braking surface shall be compatible with the brake lining specified in 3.14.5.
3.14.3.3 Tires and tubes. The tires shall be in accordance with MS35390-47, 11.00 by 15,
16-ply rating, and shall conform to MIL-T-12459. The tires shall be free of major defects when examined in accordance with MIL-STD-1224. The inner tubes shall be in accordance with MS35392-26. Valve caps shall be of metal and shall be equipped with elastomer inner seals.
3.14.3.4 Balancing. Brake drums, hubs, and tire and wheel assemblies shall be inherently in balance to preclude excessive tire wear and eliminate wheel tramp and drumming at the road speeds specified herein.
3.14.4 Chock blocks. Two wood or commercial metal chock blocks with captive chains and two wire cradles shall be furnished. The captive chain shall be wound in a figure-eight manner around the cradle ears and the hook snapped to the lower cradle loop. The length of the captive chain shall permit the chock blocks to be placed ahead of or behind the semitrailer tires. The chock blocks shall be of a minimum size as shown on figure 1 and shall withstand the imposed forces of being run over by the semitrailer. The cradles shall conform to figure 2. Installation of the cradles shall be with the two cradle ears uppermost and the short loops fastened to an approximately vertical, flat surface.
3.14.5 Brake system. The unit shall be equipped with a waterproof, straight air brake system in accordance with ICC Motor Carrier Safety Regulations, sections 193.40 through 193.43 and
193.45 through 193.50, except as otherwise specified herein. The brake system shall include
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