Tech Updates
SELECTING THE RIGHT U-BOLT
H
endrickson says there are four
specifications required to choose
the correct U-bolt.
Type of bend (round, semi-round,
square, etc.)
Length of legs (from inside highest
point to end of the thread)
Thread size and pitch (fine thread
UNF, coarse thread UNC)
Width (inside legs.
Rolled Threads vs. Cut Threads
Hendrickson says it uses only rolled
threaded U-bolts. A rolled thread provides better thread structure than a cut
thread. Rolled threads also have a better
surface quality, allowing applied torque
to go directly to clamping force.
Use the Right Tool
Ensure that a calibrated torque tool is
used and that a torque value is specified, the company says. Be aware that
certain automatic tightening tools can
result in the variations in torque value
and preload of bolts. Hendrickson says
avoid this by using a calibrated torque
tool for the final tightening torque
inspection.
Other tips from Hendrickson
Maintaining proper torque at all time is
key for suspension performance, durability and safety.
Over tightening can be just as damaging as under tightening.
Under tightened U-bolts and torque
rod bushing fasteners can cause damage
to mating components.
Flange fasteners vs. locknuts and
washers, as well as fasteners with
different torque coatings, have different torque values. Due to the larger
diameter bearing faces, flange-headed
bolts require a higher tightening torque
because more torque is dissipated by
friction.
To achieve a uniform U-bolt tension,
the locknuts should be tightened in a
crisscross pattern in 50 lb. increments.
A good tightening sequence ensures an
even preload distribution is achieved in
the joint.
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888-875-7787
www.4StateTrucks.com
I-44, Exit 4
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10
T R U C K PA R T S & S E R V I C E |
January 2014
