What is the Torque Spec for Trailer Suspension U-Bolts
Question:
What is the proper torque for u-bolts for a 2-3/8inch 3500 lb axle? Also, what is the proper torque for the shackle bolts for the same setup. Thank you.
asked by: Stuart
Expert Reply:
The correct torque spec for trailer suspension u-bolts will depend on the the diameter of the bolt. You will want to use the following depending on bolt size:
1/2" bolts: 45 ft/lbs - 70 ft/lbs
9/16" bolts: 65 ft/lbs - 95 ft/lbs
5/8" bolts: 100 ft/lbs - 120 ft/lbs
3/4" bolts: 140 ft/lbs - 160 ft/lbs
The Replacement U-Bolt part # 176400-Z has a 1/2" diameter bolt therefore, I recommend applying around 70 ft/lbs of torque. As for the shackle straps, there isn't really a specific torque rating. They have to be snug but the spring still needs to be able to move.
Product Page this Question was Asked From
Replacement U-Bolt with Nuts for 2-3/8" Round Trailer Axles - 1/2" Diameter - Zinc Plated
- Trailer Suspension Parts
- U-Bolts
- Boat Trailer
- Snowmobile Trailer
- 3500 lbs
- Round Axle - 2-3/8 Inch
- 1/2 Inch Diameter
- 5-1/2 Inch Long
- Redline
more information >
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