U-Bolt Torque Recommendation for 1/2 inch Diameter On Trailer Suspension

Question

Question:

Hi, trying to get a torque value for the above U-bolts Thanks

asked by: Nick

1

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.

expert reply by: Jameson C

1

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Brian

5/14/2026

So I just went through this with my 16' car hauler with 3500 lb axles. U bolts were 1/2" and the spec given to me by a trailer shop was 75-90 foot pounds. I went in the middle at around 80-84 and stripped 2 of them. So I agree with the previous statement of 45-70. Brought them back to trailer shop and got them warrantied but they say they don't torque them just put them tight.....ugh!!

Answer 1

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.

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Answer 2

Since you have a Yakima Ridgeback bike rack part #Y02458 the correct zip strap replacements is the part #Y8890297.

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Answer 3

The 6-Leaf Double-Eye Spring for 4,500-lb Trailer Axles - 26" Long #e27SR will be the closest fit for your 3750 lb axle. Having leaf springs rated slightly higher is normal because you will be limited in capacity by the weakest component on your…

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Answer 4

You will want to space the 2 center Hangers #28-5 31-3/4" on center and then the 2 outer hangers 28-1/4" from the center of the center hangers. This is the correct spacing using the Dexter Heavy-Duty Suspension Kit for Triple-Axle Trailers…

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Answer 5

There is no specific torque rating for shackle bolts. You'll want to ensure that the bolts you use are long enough so that when installed you will have at least 2 threads protruding from the nut. Make sure that the bolt you're using has a…

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Answer 6

If your brake actuator has electrical wires these indicate that your actuator has a reverse lockout function. The wires connect to your trailer wiring to activate this electric reverse lockout function. (This allows you to back up the trailer without…

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Answer 7

For 3,500 pound axle U-bolt kits like the Redline #APUBR-1 that use 1/2 inch hex nuts you will want to torque them down somewhere between 45 and 70 foot pounds. I have attached a great article on trailer suspension that includes this info along with…

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Answer 8

You can use leaf springs that are rated higher than the axle without any issues as long as they measure the correct measurement for your trailer. For example the 6-leaf double eye spring for 7,000 lb axles part #e64SR measures 24-7/8" eye to…

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Answer 9

Hey Johnny, we have the wheel stud part #DE52GR that matches what you are looking for with the knurl diameter of .545 inch and a thread size of 1/2 - 20. The overall length is 2 inch too. What hub do you have?

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Answer 10

I checked your order notes and the leaf springs you bought last year were the part #e28SR which are for 5k axles. Since this is over the capacity of your axle failure would not have been caused by over loading the trailer assuming you stayed under…

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Answer 11

Though I do tend to warn people about the ride getting stiffer when upping the capacity of their leaf springs, you are correct in that you will technically never be fully "unloaded". I do have to mention that this could still happen, but…

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Answer 12

I can certainly point you in the right direction. Unfortunately we do not have access to Dexter's serial number database, and I cannot recommend springs based off of axle specs. If only it were so easy right? The best way to go about replacing…

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U-Bolt Torque Recommendation for 1/2 inch Diameter On Trailer Suspension

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