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U-Bolts

(26 products)

Grade 8 U-bolts with rolled threads engineered for maximum strength and durability in heavy-duty suspension applications.

Our U-bolts feature rolled threads that retain all original material strength, unlike cut threads that weaken the bolt. Each U-bolt comes complete with 5/8 nut 18TPI and 3/16" thick hardened washers that maintain their shape under high torque loads. Rated for up to 170 ft-lbs torque, these U-bolts provide reliable clamping force for leaf spring assemblies.

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Why you should not reuse U-bolts:

Suspension U-Bolts are manufactured with a smooth rolled thread, while the mating Hi-Nuts are manufactured with sharp cut threads.

When a U-Bolt is tightened to its recommended torque level, the U-Bolt threads stretch as they mate with the Hi-Nuts. Although not always visible to the naked eye, this damages the threads. Removing the Hi-Nuts from the U-Bolt will cause a cross - threading that will not allow the U-bolt to be adequately retorqued.

Common practice in most maintenance facilities is to use an impact wrench to tighten U-Bolts. Consistent, accurate torque is next to impossible to obtain with an impact wrench, and in most cases, an over-torqued fastener is the result.

Our U-bolt manufacture recommends using a torque wrench when installing U-Bolts.

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