Nord-Lock wedge-locking technology secures bolted joints with tension instead of friction. The system comprises of a pair of washers that has cams on one side and radial teeth on the opposite side. Nord-Lock wedge-locking products positively lock the fastener in a joint which is subjected to extreme vibration or dynamic loads. The key is the difference in angles. Since the cam angle A is larger than the thread pitch B , the pair of washers expand more than the corresponding pitch of the thread. Refer to the second picture in images. Other sizes and materials available POA.
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