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|  MIL-T-62320C
3.5.13.1 U-bolts or twin Studs. When U-bolts or twin studs are used, there shall be not less
than three U-bolts or twin studs per side, with each having a 9/16-inch minimum body diameter
and 5/8-inch minimum thread diameter. Tie plates shall be at least 1/2 inch thick. The vehicle
chassis frame shall be braced using wood blocks at each mounting point, unless the mounting
point is located at a full-depth frame crossmember. Blocks shall incorporate a keeper strap or
groove for the mounting bolt and shall be of a width and thickness to assure retention. Two
tie-back straps shall be provided, one bolted to each side of the rear portion of the body
subframe, to maintain body alinement on the vehicle chassis. Forward body mounting bolts shall
be located to the rear of the tapered portion of the breaker strips (see 3.5.13.4).
3.5.13.2 Brackets. When brackets are used, they shall be bolted to the web of the chassis
frame rails. The body mounting brackets shall provide a means of drawing down the body on the
chassis rails, and provisions shall be made to prevent lateral shifting of the breaker strips. When
additional holes are required to secure the mounting brackets to the chassis frame rails, they shall
be located within the area of the rail which is designated as being safe for drilling in accordance
with the chassis manufacturer's body builder's layouts. Attachments shall neither interfere with
nor obstruct existing chassis components.
3.5.13.3 J-bolts. When J-bolts are used, there shall be not less than 7 J-bolts per side, each
not less than 3/8 inch in diameter. J-bolts shall encircle the lower chassis frame flange. Two
tie-back straps, as specified in 3.5.13.1, shall be provided. The forward J-bolts shall be located
to the rear of the tapered portion of the breaker strips (see 3.5.13.4). Provisions shall be made to
prevent lateral shifting of the breaker strips.
* 3.5.13.4 Breaker strips. A hardwood or dense southern yellow pine breaker strip, of not less
than 3/4 inch finished thickness, shall be installed between the longitudinal sills and the vehicle
chassis frame. The minimum thickness specified shall be increased as may be required to
provide adequate tire chain-to-body clearance. Breaker strips shall have a taper of not less than
1/2 inch in 16 to 18 inches at the forward end.
3.6 Servicing and adjusting. Prior to acceptance of the vehicle by the Government inspector,
the contractor shall service and adjust each vehicle for operational use including at least the
following: alinement of lights; adjustment of the engine and brake systems; filling and charging
of the battery; alinement of the front wheels; inflation of all tires; complete lubrication of chassis,
engine, and running gear with grades of lubricants recommended for the ambient air temperature
at the delivery point; servicing of the cooling system with a solution of ethylene glycol type
antifreeze and water in equal parts by volume; and servicing of the windshield washer reservoir
with water and appropriate additives.
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