Shackle bolts sold by Couplemate are high tensile 9/16″, 5/8″, M16, M18 or M20.
Suits 45mm or 60mm eye to eye with nylon bushes or shackle springs with steel bushes (Al-ko Outback rebound Series.)
How do I measure my shackle bolt? Measure from the tip of the thread to the underside of the hex head.
Sizes on offer here are
- 9/16″ Non-Greasable – 75mm
- 9/16″ Greasable – 75mm
- 5/8″ Greasable Shorty – 87mm
- 16mm Non-Greasable – 100mm
- 16mm Greasable – 100mm
- 5/8″ Greasable Long – 112mm
- 18mm Rocker Roller – 100mm
- 18mm – Standard Tandem – 100mm (Al-ko Standard Tandem 710 springs)
- 20mm – 100mm
The 16mm Greaseable Shackle Bolt suit a variety of leaf springs where a situation of metal on metal exists. 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 you springs have nylon bushes, it is not advisable to change your bolt 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.
On standard tandem and outback springs, the knurl is welded onto the shackle plate to stop the bolt from turning. A rotating bolt in the shackle plate, wear significantly increases.
How to tighten a shackle bolt.
- Tighten 16mm x 100mm greaseable shackle 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.
Standard 4″ Shackle Bolt kit can be located by clicking these links.