Recommended Solution for Shackle Bolts That are Backing Themselves Out
Updated 11/03/2025 | Published 01/15/2025
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Question:
I replaced the shackle bolts on my 2 axel 16 ft v nose and I used the knurled bolts that are required from a local trailer store. I tightened them unit the knurled end pulled all the way in but if I backed the nut off slightly, the nut would be able to spin freely and I could see it spinning all the way off over time. I’m using the correct nuts with the 3 marks on one end. But they just do not seem to be locking, is there a specific torque spec that they need to be tightened to, I do not want to leave them too loose
asked by: Mark M
Expert Reply:
Mark, there is no torque specs unfortunately. You're just going to want to make sure that the bolts are long enough, so that when they're installed you have at least 2 threads peeking out of the nut.
You could also use some blue Locktite, # LT37614, which isn't as permanent as the red Locktite but will (hopefully) keep the bolts from backing out.
Product Page this Question was Asked From
4-Leaf Double-Eye Spring for 3,500-lb Trailer Axles - 27" Long
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Jon G.
11/3/2025
Hey Mark, did the blue Loctite help keep your shackle bolts from backing out on your trailer? Your results could really help others dealing with the same issue.