Specifications

Proposal Number PSDF #P09-0004
The rails shall be 110,000 psi minimum yield and shall have a minimum section modulus of 40.09 cu. in.
calculated by using the geometric shape method. The resulting frame rail resistance to bending moment shall
be 4,406,900 in. lb. per rail (44.90 cu. in., 4,939,088 in. lb. square corner).
To insure the maximum clamp load for the fastener prevailing torque the crossmembers shall be bolted in
place using grade 8 bolts, hardened washers, and grade "C" distorted thread locknuts. Flanged head fasteners
are not acceptable. The top of the frame rails shall be free of bolt heads.
Frame engine cutouts shall be made with a plasma torch to minimize the heat affected zone of the cut. All
cutouts shall have a minimum of 6 inch transition between rail flange cut depths to reduce the stress
concentrations throughout the cutout area. The root of all transition areas shall have a minimum of a 2 inch
radius to reduce stress concentrations at the root.
The main and first inner frame rails shall be powder coated prior to chassis painting to reduce the effect of
harsh road chemicals.
TOW HOOKS
Two (2) chromed tow hooks shall be provided and shall be attached directly to the front frame extension
under
the bumper. These tow hooks shall be attached with two Grade 8 bolts with hardened washers and Grade
"C" distorted thread locknuts.
FRONT BUMPER
A 10" high heavy-duty 10 gauge, polished stainless steel, wrap around, 2-rib front bumper shall be provided
the full width of the cab.
BUMPER EXTENSION
The front frame extension shall be bolted directly to the main rail. The extension and main rail joint shall
have a 3/8" thick side plate for reinforcement. The completed apparatus must be able to be lifted at the front
bumper without structural damage to the front extension for towing of a disabled vehicle.
The front bumper face shall extend 21 inches ahead of the front face of the cab skin.
GRAVELSHIELD
A gravelshield shall be installed filling the area above the extension rails. This gravelshield shall be
constructed of .125" thick NFPA non-skid, bright, non skid, aluminum treadplate. The gravelshield shall be
supported at the front by the top flange of the stainless steel bumper. At the rear, the gravelshield shall be
supported by a steel substructure.
CENTER HOSE REEL
A well shall be installed in the center of the gravelshield. The well shall be constructed of .125" aluminum.
The upper edges of the hose well shall be tapered to allow for smooth, snag free removal of the hose. In the
well shall be installed an electric rewind hose reel installed. One hundred Fifty feet of 1” Reel-Tex hose
( One 100’ and one 50” sections ) shall be furnished. An opening in the bumper for hose rollers shall be
Page 10