What is the torque on U bolts?

A properly torqued u-bolt stretches by design resulting in a clamping force that acts as a spring clamp, holding the components of the suspension together. The torque specs for a 1/2″ u-bolts which is the size most frequently used on Venture Trailers is 45ft/lbs-70ft/lbs.

What are the torque specs for U-bolts?

Recommended U-Bolt Torque for Cold-Formed U-Bolts

Size Material Grade Max. Torque Ft. Lbs. Plated
1/2 – 20 5 52
9/16 – 18 5 75
5/8 – 18 8 132
3/4 – 16 8 234

How tight should you tighten U-bolts?

Tighten all U-Bolts until they are snug only. Tighten in the sequence shown to approximately 1/3 of recommended torque. Repeat, using the same sequence, gradually increasing the torque through a second and third stage until the recommended final torque is attained.

Do U-bolts need to be torqued?

For Cold-Formed U-Bolts. For 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.

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What should leaf spring U-bolts be torqued to?

What Torque Should Be Used For U-Bolt Nuts On Trailer Suspension If the U-bolts are 9/16 inch diameter, the torque specs should be between 65 to 95 foot lbs. If the U-bolts are 3/8 inch diameter, the torque should be between 30 and 50 foot lbs. view full answer…

How much torque does a 1/2 U-bolt have?

Helpful Expert Reply: For 1/2 inch trailer u-bolts that attach to axle the recommended torque value is between 45 and 70 ft lbs of torque.

Do U-bolts stretch?

While the U-bolt has some flexibility in its ability to stretch after being loosened, the bolt will never tighten enough to allow it to regain its full torque spec potential. The next issue with trying to reuse U-bolts has to do with the threads themselves. When being tightened, the threads stretch out under torque.

What happens if you over tighten u-bolts?

One of the most damaging ways to do that is by over-tightening, or over torquing the fastener. This can result in stripping screws, snapping screw heads and damaging pre-tapped threading.

How much weight can u-bolts hold?

How Much Weight Can An Eye Bolt Hold?

Shank Diameter (in) Weight Capacity (lbs)
7/8 7,200
1 10,000
1-1/4 15,000
1-1/2 22,000

How do you tighten U-bolt leaf springs?

Place the new U-bolt around the leaf spring. Connect the two portions of the “U” with two nuts. Use a torque wrench for the installation. Tighten them in a cross pattern, gradually bumping up the torque.

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What should trailer lug nuts be torqued to?

Lug nuts should be torqued to 100 ft/lbs. Always follow the appropriate star pattern as indicated in these instructions or in your axle manufacturer’s owner’s manual to assure proper torque. 1. Set your torque wrench to 100 ft/lbs.

When should the U-bolts on a spring suspension be re torqued after installation?

Also, TMC recommends running the truck on a course where maximum articulation of the suspension occurs after installation, then loading the suspension before retorqueing the U-bolts. They should be retorqued again between 3,000 and 5,000 miles after replacement.

How tight do you tighten leaf springs?

Tightening the shackle bolts too much will squeeze the shackle straps against the leaf springs and the whole suspension system will bind and cause problems. The best thing to do when tightening down shackle bolts is to use lock nuts and tighten them until they are snug and then backed off 1/4 turn.

How is a U-bolt measured?

The length (L) is measured from end of bolt to inside of the bend, while the width (C) is measured between the legs. … Since round U-bolts can be measured differently, we recommend communicating U-bolt dimensions through the use of a detailed drawing.