9/16 Inch Shackle Bolt

9/16 inch Shackle Bolts for Caravan and Trailer

9/16 inch shackle bolts for 45mm caravan and trailer springs are 9/16 inch high tensile.

Suits 45mm eye-to-eye shackle springs.

How do I measure my shackle bolt?

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

• 9/16 inch Non-Greasable - 3.5"  [Supplied with Zinc Nyloc Nut]
• 9/16 inch Greasable - 3.5"  [Supplied with Zinc Nyloc Nut]

Worn Tandem Hangers (5/8" or 16mm)

Yes, there is a fix for this problem.

• Standard hangers use a 3.5-inch shackle bolt, measured from under the head to the thread's top.
• Cut the head off a centre hanger leaving 2 x halves left.
• Use a 4-inch shackle bolt and bolt the two halves over the existing hanger.
• Weld the two 1/2 plates over the old worn hangers.
• The problem is now fixed.

Sizes on offer

• 1/2" Case Hardened - 3.5"
• 9/16" Non-Greasable - 3.5"
• 9/16" Greasable - 3.5"
• 5/8" Greasable Short - 3.5" to suit 45mm tandem rocker centre bolt
• 16mm Non-Greasable - 100mm to suit standard tandem 60mm springs
• 16mm Greasable - 100mm to suit Alko Rocker Roller and Outback Springs
• 5/8" Greasable - 4.25" to suit Manutec Rocker Roller Springs
• 5/8" Greasable Long - 4.50"
• 18mm Rocker Roller - 100mm
• 18mm - Standard Tandem - 100mm (Al-ko Standard Tandem 710 springs)
• 20mm - 100mm

The 16mm Greaseable Bolt suits various leaf springs where a situation of metal on metal exists. For example, rocker springs and outback springs have a metal roller or bush that requires a greaseable bolt.

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.

News: How to fix Dangerous Caravan Vibration Fatigue

How to tighten suspension bolts.

• Tighten 16mm x 100mm greaseable 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.