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What is Torque for 3,500 lb Axle U-Bolts  

Updated 03/17/2025 | Published 03/14/2025

Question:

Hi Boat trailer slipper leaf springs at 1750lb each , with 3500lb axle. What are the torque specs for the spring/axle U bolts for 7/16inch and 1/2 Thank you

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Expert Reply:

Hey Dirk, the correct torque spec for 3,500 lb axle u-bolts is 45 and 70 ft lbs. Are you replacing leaf springs?

expert reply by:
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Jameson C
Dirk profile picture

Dirk

3/17/2025

Thats a pretty big spread in values , is there not a target like 65ftlbs ?

Jameson C. profile picture
Etrailer Expert

Jameson C.

3/17/2025

@Dirk Yeah it's goofy how big of a range it is. I think the lesson here is that it's not super exact and I wouldn't stress about it too much.

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