Specifications

There shall be spacers included with the air tank mounting. The spacers shall move the air tanks 1.50
inches inward towards the center of the chassis. This shall provide clearance between the air tanks and
the frame for body U-bolt clearance.
REAR AIR TANK MOUNTING
If a combination of wheel base, air tank quantity, or other requirements necessitate the location of one or
more air tanks to be mounted rear of the fuel tank, these tank(s) will be mounted perpendicular to frame.
WHEELBASE
The chassis wheelbase shall be 174.00 inches.
REAR OVERHANG
The chassis rear overhang shall be 54.00 inches.
FRAME
The frame shall consist of double rails running parallel to each other with cross members forming a
ladder style frame. The frame rails shall be formed in the shape of a "C" channel, with the outer rail
measuring 10.25 inches high X 3.50 inches deep upper and lower flanges X 0.38 inches thick with an
inner channel of 9.44 inches high X 3.13 inches deep and 0.38 inches thick. Each rail shall be
constructed of 110,000 psi minimum yield high strength low alloy steel. Each double rail section shall
be rated by a Resistance Bending Moment (RBM) minimum of 3,213,100 inch pounds and have a
minimum section modulus of 29.21 cubic inches. The frame shall measure 35.00 inches in width.
Proposals calculating the frame strength using the “box method” shall not be considered.
Proposals including heat treated rails shall not be considered. Heat treating frame rails produces rails
that are not uniform in their mechanical properties throughout the length of the rail. Rails made of high
strength, low alloy steel are already at the required yield strength prior to forming the rail.
A minimum of seven (7) fully gusseted 0.25 inch thick cross members shall be installed. The inclusion
of the body mounting, or bumper mounting shall not be considered as a cross member. The cross
members shall be attached using zinc coated grade 8 fasteners. The bolt heads shall be flanged type, held
in place by distorted thread flanged lock nuts. Each cross member shall be mounted to the frame rails
utilizing a minimum of 0.25 inch thick gusset reinforcement plates at all corners balancing the area of
force throughout the entire frame.
.
Any proposals not including additional reinforcement for each cross member shall not be considered.
All relief areas shall be cut in with a minimum 2.00 inch radius at intersection points with the edges
ground to a smooth finish to prevent a stress concentration point.