U-Bolt Torque is very Important 

and

 Always use new U-Bolts when doing spring work

U-BOLTS provide the clamping force needed to hold the springs to the axle. While some vehicles use other methods to provide the clamping force (some Camaro/Firebird's use T-bolts), U-bolts have proven to be the easiest, the most economical and most reliable way of attaching springs to an axle.

Whenever springs are replaced or repaired, the u-bolts should be replaced. The threads on most u-bolts are not cut, they are rolled.

When the U-bolts are tightened, the threads are deformed by the nuts. 

Obtaining the proper torque (clamping force) can never be achieved when reusing old u-bolts. 

The weakest part of any spring leaf is at the hole where the center bolt goes through the leaves. 

Correctly torqued U-bolts make the center section of the spring immobile. 

Any, repeat, any, movement in the area of the center bolt will cause the spring to break in this area.

Breakage in the U-bolt area voids any warranty.

Never use lock washers because they can break. Also never use soft metal washers on U-bolts because they will deform under torque. Both cases will cause the nuts to loosen and will cause the spring to fail from breakage within the u-bolt area.

Always use hardened washers. We supply extra thick hardened washers with each u-bolt.

Reusing old u-bolts is penny wise and pound foolish. (this means you are cheap)

Torque specs shown are only recommendations. You should always follow your vehicle's manufacturers recommendations.

1,300

 1,740

Always re-torque the newly installed u-bolts after 50 miles of driving. 

Then recheck after another 50 miles.

Then again after 500 miles. 

Finally, recheck the u-bolt torque every time you are under the vehicle.

Remember - Tight u-bolts will extend a spring's life.

 1555 Michigan, Detroit, MI 48216

phone 1-313-963-3839   fax 1-313-963-7047

sales@eatonsprings.com