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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. For bolt size M3 (#5) Carbon Steel Delta Protekt (zinc flake coating) Through Hardened General Steel Applications USED AS A PAIR 20 Pairs Per Package