U-Bolt Torque Table
More details available at each link
Measuring a Leaf Spring
There are six important factors to look at in order to identify a leaf spring...
U-Bolts provide the clamping force required to clamp the leaf spring, top plate, axle seat, axle, and bottom plate firmly together, and are critical to the overall stability of spring operation. They work to perform the following functions...
Recommended U-Bolt Torque for Cold-Formed U-Bolts
Cold-Formed U-Bolts which have been torqued to a set preload are recommended to be re-torqued after a short time to take up the stretch in the set of the material.
U-Bolts that have been well lubricated with an anti-seize compound will have a torque range between plated and unplated values. All the below values are general guidelines.
The OEM Service Manual on specific models always takes precedence over values shown.
|Size||Material Grade||Max. Torque Ft. Lbs. Plated||Max. Torque Ft. Lbs. Unplated|
|3/8 - 24||5||21||26|
|7/16 - 20||5||33||44|
|1/2 - 20||5||52||70|
|9/16 - 18||5||75||100|
|5/8 - 18||8||132||177|
|3/4 - 16||8||234||313|
|7/8 - 14||8||375||500|
|1 - 14||8||758||1010|
|1-1/8 - 12||8||848||1131|
|1-1/4 - 12||8||1163||1551|