The Challenger JSJ6-12 Arm Restraint Outer Gear is a replacement gear used in the arm locking system on select Challenger 12K 2-post lifts.

This gear works in conjunction with the restraint shaft, inner gears, and pawl components to synchronize arm movement and ensure positive locking at all lift positions. When worn or damaged, the arm lock may fail to engage properly, making this gear essential for restoring safe lift operation.