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MIL-T-62320C
3.5.2 Body framing. Body framing shall be of all-steel welded construction, braced at all
points of stress. There shall be not less than 10 full-width crossmembers, including the ends, of
full-channel or I-beam steel construction, attached to the longitudinal sills by welds. Angle
gussets (when used), crossmembers, longitudinal sills, and welded reinforcements (when used)
shall be joined by weld for not less than 50 percent of the length of the contact edge(s). Spacing
of crossmembers shall be equal, ahead of, and to the rear of the wheels. Longitudinal sills shall
be constructed from structural steel channels or reinforced, formed channels. Formed channel
sills shall be reinforced within the sill, at each crossmember or body mounting point, with
formed channel reinforcements. The crossmember, angle gussets, formed longitudinal sills, and
reinforcements shall be not less than 10 gage (0.1345 inch) steel. Side and front rails (out-rails)
shall be not less than 12 gage (0.1046 inch) steel. Design of the subframe shall permit low floor
height, provide tire chain clearance, and shall permit vehicle operation at speeds up to 55 mph
over improved roads when loaded with an evenly distributed payload to the rated GVW, without
evidence of permanent deformation. Side, front and rear post construction shall be not less than
14 gage (0.0747 inch) pressed steel. Bodies shall have at least 10 posts per side with not less
than five posts at the front and four at the rear with two of the rear posts spaced to support the
rear doors. The front structure shall be capable of withstanding a horizontal static load equal to
0.4 times the payload capacity of the vehicle without permanent distortion.
3.5.3 Body exterior. Roof assembly shall be standard for the vehicle, and shall be
constructed to ensure drainage. Roof design shall include roof support bows of not less than
16 gage (0.0598 inch) steel, and spacing shall be that of side posts; the roof panels shall be not
less than 22 gage (0.0299 inch) steel, or 0.032 inch aluminum alloy. Body side panels shall be
stretcher level sheet steel or equivalent flat, of not less than 20 gage (0.0359 inch). All roof and
body seams and joints shall be waterproof and all body and roof corners and body roof edges
shall be rounded with a maximum radius of 6 inches. When the perimeter of the roof is
furnished with extrusions, square type roof corners and posts in lieu of round radius corners are
acceptable. Replaceable rub rails of not less than 12 gage (0.1046 inch) steel shall be provided
along each side of body. Full length drip molding shall be mounted above all doors and
windows that open.
3.5.4 Van body wind deflection. Unless a wind deflector is specified, an aerodynamically
streamlined body front shall be incorporated into the design of the body to direct airflow around
the sides and over the top of the van body. The construction shall be integral with the van body
front wall, sidewalls and roof, giving a curved front radius. When specified (see 6.2), a wind
deflector fairing shall be attached to the upper front face of the van body. The deflector shall
have an aerodynamic fairing shape to direct airflow around the sides and over the top of the van
body. The deflector fairing shall have a rounded nose with a convex profile in both side and top
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