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A worn or undersized bolt can throw off your suspension alignment. This 9/16" diameter Grade 5 shackle bolt gives a strong, precise mount for double-eye leaf springs, keeping your suspension tracking the way it should. It’s built for dependable performance where the spring meets the hanger, making it the right fit for standard trailer suspension setups.
Trailers see plenty of water, mud, and road grime. The corrosion-resistant zinc finish on this bolt keeps rust from eating away at your suspension hardware. It’s a better choice than raw steel when you want lasting protection against the elements and a cleaner look that holds up over time.
A loose nut is the last thing you need on the road. The included locknut threads on snugly and stays put thanks to its Nylock design. It resists backing off from vibration, so the bolt stays tight and your suspension holds firm through bumps and turns.
Getting the right length matters for proper suspension movement. This bolt measures 3" under the head with 2-3/8" of usable length and a 9/16"-18 fine thread. That sizing gives the spring eye room to move without binding while still tightening down securely for a stable ride.
Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.
Hello everybody, this is Jeff at etrailer.com. Today we're gonna take a look at the three inch long, 9/16 diameter Zinc Shackle Bolt with the locknut for your trailer leaf springs. Now, this 9/16 diameter shackle bolt is used to mount your leaf spring to your trailer's front or rear suspension hanger, and this part will include the locknut that secures the bolt to the hanger. Both these parts are a corrosion resistant zinc finish. This is for a quantity of one bolt and one locknut. Now, few dimensions, we'll start with the bolt itself, we mentioned the diameter on this, it's gonna be right at 9/16 of an inch.
The bolt head size or the socket size you would use on this, it's gonna be 13/16 of an inch. Now, the length under the bolt head to the very end of the bolt is gonna be right at three inches, the usable length, which would be from under the bolt head to where the thread starts, is 2 3/8 inches, and just the thread length is about 5/8 of an inch. Now, the thread size on this is 9/16 by 18 threads per inch, and the lock nut, which will install right on here, when you go to install it, that's gonna have a diameter or head size of 7/8 of an inch. But that should do it for the review on this three inch long, 9/16 diameter Zinc Shackle Bolt with the locknut for your trailer leaf springs.
Ratings & Reviews
Gwendolyn Y.
2/12/2025
The rebuild is looking awesome, Jerry. What is your go to spot for fishing weekends?
Robert H.
10/21/2014
After a year in use and 3,000 miles of high speed interstate and heavy load everything is GREAT.
Doug V.
8/18/2016
Everything has worked great! Thanks for great parts, prices
Do you have a question about this Trailer Suspension Part?
Info for this part was:
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David K.
7/22/2026
Bolts have never rusted still look like brand new really strong bolts would really recommend buying these if you need them for your trailer. They were very reasonable priced also because I went to tractor supply Lowes a couple different hardware stores and lesser bolts were very much more expensive.