Round U-Bolts - Grade 8

How to Measure a Round U-Bolt

Truckspring.com uses the finest quality SAE Grade 5 and SAE Grade 8 steel, to provide you the best quality u-bolts. All threaded rod manufacturing processes are ISO 9002 and QS-9000 certified, to ensure the best quality products.

We stock Grade 8 u-bolts in the following diameters: 5/8", 3/4", 7/8", 1", 1-1/8", and 1-1/4", and Grade 5 Round u-bolts in the following diameters: 1/2", 9/16", and 7/8".

To Purchase Grade 8 Round U-Bolts

Measure the diameter of the u-bolt, and click on the link below, to see a quick reference chart of the Grade 8 Round u-bolts we stock and pricing:

Custom Bent U-Bolts

If you do not find the u-bolt that meets your requirements, send us an email, or give us a call @ 1-800-358-4751. We have a Centermark bender, and can custom bend u-bolts to your specifications. In most cases, custom bent u-bolts ship the same day.

Need Custom Bent U-bolts?

Call 1-800-358-4751 for expert advice on U-Bolts. Or send us an email. We're open (Eastern Time Zone):
  • M-F: 7am - Midnight
  • Sat: 8am - 1pm
Secure online ordering is available 24 hours a day, 7 days a week.

Threaded Rod & U-bolt Links

About U-Bolts

U-Bolts on many suspensions provide the force necessary to create what is called the center clamp. This provides the permanent tie between not only the spring leaves, but between the spring and spring seat as well. The clamp performs the following functions:
  • Attach the spring firmly to the axle seat
  • Prevent leaf breakage through the center bolt section
  • Prevent center bolt breakage due to shear

U-Bolt Q&A

Q.  If I'm replacing a spring, can I re-use the old u-bolts?

A.  No, you should never re-use u-bolts. A properly installed U-Bolt stretches a little bit under torque. The results of this small amount of stretching and its effects on the U-Bolt threads and deep nut, lower a used U-Bolt's ability to sustain the required clamping torque.

Q.  Is torque important when I tighten u-bolts?

A.  You bet it is. The following are a list of common problems resulting from improperly torqued u-bolts:
  • looseness in seat area
  • excessive wear on chassis components
  • possible spring breakage
  • possible axle slippage and misalignment