Do Threads of U-Bolt Trailer Suspension Need to be Lubricated When Torqued
Updated 09/02/2025 | Published 06/23/2025
Question:
Hi. When installing new leaf springs on boat trailer and new U bolts , do you lubricate the threads on the U bolts before you torque them to spec ? Or do you keep the threads dry ? Thank you
asked by: Dirk
0
Expert Reply:
Hey Dirk, this is a great question but it is not required or recommended to lubricate the threads of trailer suspension u-bolts before torquing them down. Doing so would affect how tight the nut would get.
expert reply by:
Jameson C
0
Product Page this Question was Asked From
Replacement U-Bolt for 2" Wide, Square Axles - 1/2" Diameter - Zinc Plated
- Trailer Suspension Parts
- U-Bolts
- Boat Trailer
- Snowmobile Trailer
- 3500 lbs
- Square Axle - 2 Inch
- 1/2 Inch Diameter
- 5-1/4 Inch Long
- Redline
more information >
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Jameson C.
9/2/2025
Hey Dirk, did you end up installing the new leaf springs and U-bolts without lubricating the threads? I'm curious to know how it worked out for you, as it might help others in a similar situation.