M8 8.7 x 16.6 x 2.5mm Nord-lock Washer Stainless Steel SP A4 NL8SPSS 1090

Stainless steel. SP (enlarged outer diameter) Tension makes the bolt self-locking 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 " α " is larger than the thread pitch " β ", the pair of washers expand more than the corresponding pitch of the thread.