M42 43.2 x 63 x 5.8mm Nord-lock Steel Washer, Delta Protekt® coating NL42

Tension makes the bolt self-locking Nord-Lock wedge-locking technology secures bolted joints with tension instead of friction. The system comprises a pair of washers with cams on one side and radial teeth on the opposite side. Nord-Lock wedge-locking products positively lock the fastener in a joint subjected to extreme vibration or dynamic loads. The key is the difference in angles. Since the cam angle " α " is larger than the thread pitch " β ", the pair of washers expand more than the corresponding pitch of the thread.