What Holds Nut of Shackle Bolt With Lock Nut in Place
Updated 01/12/2026 | Published 09/06/2024
Question:
Hello, I have a basic question. On Part Number: 166081, a 3inch shackle bolt with lock nut, exactly how does the nut stay tightened? I have watched your videos on changing leaf springs. In the video they say to tightened the shackle nut, then back it off a quarter of a turn. Probably a stupid question, but after backing the nut off, what prevents the nut from possibly vibrating loose eventually? There is no Loc-Tite, lock washer, or jam nut mentioned, so, is the lock nut made specifically to resist vibrating loose?
asked by: Jeff W
Expert Reply:
Hey Jeff, this is a great question but the nut that comes with the Shackle Bolt part # 166081 is a lock nut that has nylock in it which holds the nut in place although it is not technically torqued down super tight.
Product Page this Question was Asked From
Shackle Bolt with Locknut for Double-Eye Springs - 3" Long
- Trailer Suspension Parts
- Suspension Bolts
- Camper
- Car Hauler
- Utility Trailer
- 9/16 Inch Diameter
- 3 Inch Long
- ABS Fasteners
more information >
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on Trailer Suspension Parts
Jameson C.
1/12/2026
Hey Jeff, did the nylock feature on that shackle bolt hold the nut in place the way you expected? Knowing how it performed could help others wondering about vibration issues on similar setups.