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U-Bolt Torque Specifications. Here are the torque specifications for our NF fine thread U-bolts. The recommended foot-pound values for tightening the U-bolt nuts vary depending on the U-bolt diameter. It's important to adhere to these specifications for proper installation.
Recommended torque levels from the vehicle or suspension manufacturer should always be used where possible. If these specifications are unknown, the following chart can be used as a guide.
U-Bolts that have been well lubricated with an anti-seize compound will have a torque range between plated and unplated values. All the above values are general guidelines. The OEM Service Manual on specific models always takes precedence over values shown.
NEVER RE-USE UI-BOLTS THE CHANGES THAT OCCUR TO A U-BOLT AS IT IS BEING TORQUED, CAUSES THE U-BOLT THREADS TO DISTORT UNDER THE CLAMPING FORCE. THIs REDUCES THE RE-USED U-BOLT'S ABILITY TO MAINTAIN PROPER CLAMPING FORCE OVER TIME. QUESTIONS? PLEASE DO NOT HESITATE TO CONTACT uS! SERVICE.
The U-bolt grade is a measure of the material's strength. Grade 5 and 8 are the most commonly used with grade 8 material offering an increase in yield strength of over 40% better than that of grade 5 material. This allows for higher torque levels, and thereby, improved spring clamping.
U.S. Recommended Bolt Torque Table. * Sizes from 4 to 10 are in in.-lbs. Sizes from 1/4 up are in ft.-lbs. ** Fine thread figures are for 1-14. Grade 2, 5, and 8 values are for plated bolts.
The recommended U‐Bolt torque specs will help to keep the leaf springs tight and maintained. If the OE specifications are not available, we recommend to use the standard torque values for bolts and rods. A regular U‐bolt torque check is very important. Hereby some minimum guidelines:
