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What Torque Should Be Used For U-Bolt Nuts On Trailer Suspension  

Question:

Hello, I am changing the leaf springs on my boat trailer. When I tighten down the u-bolts, is there a foot pound number I should tighten them down to?

1

Helpful Expert Reply:

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.

expert reply by:
1
Jeffrey L
Dave profile picture

Dave

9/27/2024

Jeffery Hi, I need to re-align the bunks on our boat trailer and need to know if this also applies to the U-bolts for bunk brackets? Mine as 3/8" U-bolts with a nut and washer on each end of the bunk U-shaped bunk bracket bolt. Given bolt diameter I assume the correct approximate torque is 30 - 50 or around 40 foot pounds of torque. Though I'm uncertain of the threads per inch on this bolt and it appears they are zinc plated galvanized bolts not stainless steel. Thanks Dave

KyleS profile picture

Kyle S.

9/27/2024

@Dave Yep, you assumed correctly, it is 30-50 ft. lb of torque and 40 would be just fine.
Dave profile picture

Dave

9/27/2024

@KyleS Thanks! I appreciate the info and the very prompt response!
Anthony profile picture

Anthony

2/4/2025

I have a 10000 dual axles i realigned the axles put new hangers and equalizer im wound what are the inch pounds they get torqued down too

JamesonC profile picture
Etrailer Expert

Jameson C.

2/4/2025

@Anthony What diameter u-bolts are they?
3/4B profile picture

3/4 B.

2/6/2025

@JamesonC they are 3/4 U bolts
JamesonC profile picture
Etrailer Expert

Jameson C.

2/6/2025

@3/4B For 3/4 inch diameter U-bolts the correct torque spec would be 160 ft lbs.

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