U-Bolt Torque Specifications

A U-bolt is a type used on automobiles to join certain components. These bolts, like any other on a car, have specific torque, or tightening, values. Proper application of torque ensures all of your components are joined and fitted.

Applications

U-bolts operate clamps to hold the springs to the vehicle's axle. While U-bolts are not the only way to hold them together, they are the easiest, least expensive and most reliable method for doing so.

Torque Specifications

Although torque differs from bolt to bolt and from vehicle to vehicle, estimated and recommended torque specifications are possible. For example, U-bolts with a rod diameter of 3/8 of an inch will torque to around 30 foot-pounds and those with a rod diameter of 9/16 of an inch will torque to about 90 foot-pounds of torque. Check your vehicle manufacturer's recommendations for precise values.

Warnings

Never re-use old U-bolts. Achieving the proper torque is impossible in used U-bolts. Anytime you replace the car's springs, you should replace the U-bolts.

Torquing U-bolts is also the only way to ensure that your springs are attached correctly. Correctly torqued U-bolts prevent the center section of the spring from moving at all.

References

• Eaton Springs: U-Bolt Torque is very Important
• L&H Rods: U-Bolts