Nord-Lock wedge-locking technology secures bolted joints with tension instead of friction. The system is composed of a pair of lock washers with cams on one side and radial teeth on the other.
Nord-Lock wedge-locking products secure the fastener in a joint which cannot be loosened even when subjected to extreme vibration or dynamic loads. The Nord-Lock range includes steel construction washers, wheel nuts, combi bolt washers and custom solutions.
Nord-Lock wedge-locking washers utilise tension instead of friction in order to secure bolted joints exposed to severe vibration and dynamic loads.
Over the operational life cycle, Nord-Lock washers offer increased operational reliability and lower maintenance costs, while significantly reducing the risks of production stops, accidents and warranty claims.
When the bolt and/or nut is tightened, the teeth grip and seat the mating surfaces. Since the cam angle α, is larger than the thread pitch β, a wedge effect is created by the cams, preventing the bolt from rotating loose. The Nord-Lock wedge-lock washer is locked in place, allowing movement only across the face of the cams. Any attempt from the bolt/nut to rotate loose is blocked by the wedge effect of the cams.
When a bolt is untightened with a wrench, the pair of washers expand more than the corresponding pitch of the thread, allowing the bolt/nut to rise. Nord-Lock wedge-lock washers positively secure the fastener in a joint which is subjected to any kind of vibration or dynamic loads.
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