Torque Specs When Installling 4-Leaf Double-Eye Leaf Springs on 3,500 Pound Axle

Published 12/06/2019

Products Featured in This Question

4-Leaf Double-Eye Spring for 3,500-lb Trailer Axles - 25-1/4" Long

(2431)

$58.01

U-Bolt Kit for Mounting 3,500-lb, Round Trailer Axles - 5-1/2" Long U-Bolts

(2253)

$79.34

Question:

No instruction with mounting hardware for 4 leaf 1700 lb springs, need torque reccommendation......thanks.

asked by: Paul B

Expert Reply:

Assuming you are using 1/2" diameter U-bolts like # APUBR-1 for your 4-Leaf Double-Eye Spring # e54SR, you will want to torque the nuts down somewhere between 45 and 70 foot pounds.

The shackle bolts at the end of the springs don't require a specific torque spec because you really don't want to tighten them up too much. This can potentially squeeze the shackle straps against the leaf springs and bind up the suspension. The best method is to use lock nuts and simply tighten them until they are snug, backing them off about a 1/4 turn from there.

I have attached a really great help article below on double-eye leaf spring systems that you might also check out.

expert reply by: Chris R