3.5.6.4
REAR BUMPER.
sills by welds on maximum 30 cm (12
A heavy-duty step bumper shall be
inches) centers. When sub framing is a
provided. A safety-tread steel plate step,
welded assembly, angle gussets (when
integrated with the frame attached rear
used), crossmembers, longitudinal sills,
bumper, shall be furnished; extending
and welded reinforcements (when used)
across the width of the body, having a
shall be joined by weld for not less than
step surface not less than 23 cm (9
50 percent of the length of the contact
inches) deep.
edge(s). Spacing of crossmembers shall
be equal, ahead of, and to the rear of the
3.5.7
TYPE VII (VAN).
wheels.
Longitudinal sills shall be
Type VII vehicles shall have an overall
constructed of structural steel channels,
height of not more than 3810 mm (150
structural steel I-beams, formed steel
inches) and the minimum dimensions as
channels or form rolled steel I-beams.
specified for the Standard Item Number.
Formed channel sills shall be reinforced
Effective means shall be taken to prevent
with formed channel reinforcements within
electrolytic action between dissimilar
the sill. Formed channel reinforcements
metals.
shall be provided at each subframe
crossmember attachment point and at
3.5.7.1
VAN BODY.
each chassis mounting point. Form rolled
The body subframe, rear corner posts,
I-beam sills shall be high tensile 345 MPa
rear header, rear crossmember, rear
(60,000 psi) yield steel, not less than 100
bumper and dock bumper shall be
mm (4 inches) high and not less than 4.75
constructed of steel. Body, front posts,
kg/m (3.190 pounds per foot). Formed
roof panels, rub rails or buffer sheets, side
channel crossmembers, gussets, formed
and front wall panels shall be constructed
channel
longitudinal
sills
and
of aluminum except when option code
reinforcements shall be of not less than 7
FRP is specified. Roof bows and side
gage (2.39 mm) (0.094 inch) steel.
posts shall be aluminum or galvanized
Extruded aluminum or steel side and front
steel (see 3.5.7.4). The steel used shall
rails shall be furnished. When steel side
be of the minimum gages specified for
and front rails (out-rails) are furnished
carbon steel; high tensile steel used may
they shall be of not less than 12 gage
be two gages lighter weight in accordance
(2.657 mm) (0.1046 inch) steel. Design of
with US Standard gages.
the subframe shall permit low floor height,
while providing tire chain clearance.
3.5.7.1.1 VAN BODY WIND DEFLECTION.
Understructure shall be rust proofed in
Unless otherwise specified herein, an
accordance with FED-STD-297.
aerodynamically streamlined body front
shall be incorporated into the design of
3.5.7.3
VAN BODY FRAMING.
the body to direct airflow around the sides
Side and front post construction of
and over the top of the van body. The
aluminum or galvanized steel bodies shall
construction shall be integral with the van
be extruded aluminum and shall be not
body front wall, sidewalls and roof, giving
less than 29 mm (1.125 inches) in depth
a curved front radius.
and 0.49 kg/m (0.330 pound per foot)
when side and front wall posts are spaced
3.5.7.2
VAN BODY SUBFRAME.
on 406 mm (16 inch) maximum centers.
Van body sub frame shall be welded steel
Side and front post construction shall be
construction, braced at all points of stress.
extruded aluminum and shall be not less
Crossmembers shall be full width,
than 32 mm (1.25 inches) in depth and
minimum 7.5 cm (3 inches) depth, of full
0.64 kg/m (0.43 pound per foot) when
channel, I-beam or equivalent section,
side and front wall posts are spaced on
steel construction, attached to longitudinal
460 mm (18 inch) maximum centers.
Page 29 of 79
to verify that this 7 4Y
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