9/16 x 3.5-inch Non-Greaseable Shackle Bolt

9/16 x 3.5-inch non-greaseable shackle bolts are necessary to fasten the 8mm x 45mm slipper and shackle springs to the trailer chassis.

Nylon or Polyurethane are self-lubricating spring insert bushes that do not require greaseable shackle bolts.