5/8 inch UNF Shackle Pin

5/8 inch UNF Shackle Pin or Bolt for Caravan and Trailer

5/8 inch UNF shackle pin or bolt shackle bolts for caravans and trailers sold are high tensile 5/8 inch with Nyloc Nuts.

How do I measure my shackle bolt?

Measure from the tip of the thread to the underside of the hex head. 

Sizes on offer

• 5/8 inch Non Greasable Short - 3.5 inch to suit 45mm tandem rocker centre bolt
• 5/8 inch Greasable Short - 3.5 inch to suit 45mm tandem rocker centre bolt
• 5/8 inch Greasable - 4 inch to suit Rocker Roller Springs
• 5/8 inch Non Greasable - 4 inch to suit Rocker Roller Springs
• 5/8 inch Greasable - 4.25 inch to suit Rocker Roller Springs
• 5/8 inch Greasable Long - 4.5 inch

Non-greaseable bolts fit inside a self-lubricating nylon bush and do not need grease. If your springs have nylon bushes, it is not advisable to change your pin to greaseable.

The knurl under the head has a particular purpose. The knurl locks into the shackle plate to help prevent the bolt from spinning during spring compressions. Broken welds are a good sign the bolts need replacement.

The knurl is welded onto the shackle plate on standard tandem and outback trailer springs to stop the bolt from turning. With a rotating bolt in the shackle plate, wear significantly increases.

How to tighten suspension bolts.

• Tighten the bolt until home.
• Back off 1/4 turn.
• You need a small space between your shackle plates and spring; otherwise, you will develop an annoying squeak.
• This squeak is due to no tolerance between shackle plates and spring.