Nord-Lock wedge-locking products are recognized around the world for their ability to secure bolted joints exposed to severe vibration and dynamic loads. The system cannot loosen unintentionally as it creates a wedge underneath the bolt head/nut. An ideal solution for bolted joints where failure is not an option.
In addition to Nord-Lock wedge lock washers, the range also includes steel construction washers, wheel nuts, combi bolt washers and custom solutions.
Nord-Lock wedge-locking technology secures bolted joints with tension instead of friction. The system comprises of a pair of lock 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 rise of the cams between the Nord-Lock wedge lock washers is greater than the pitch of the bolt. In addition, there are radial teeth on the opposite side. The wedge lock washers are installed in pairs, cam face to cam face.
Nord-Lock locking washers are proven as a safe bolt securing system according to DIN 65151 tests performed by the independent research organisations IMA and CETIM. In addition, Nord- Lock personnel performs over 10,000 live Junker vibration tests around the globe every year.
The Junker test shows that Nord-Lock wedge lock washers safely secured the bolted connection; only a limited amount of tension is initially lost due to normal settlements. The wedge-locking function is verified through the clear increase in tension during untightening. All other bolt locking methods in the test failed to prevent loosening of the joint.
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The National Aerospace test, according to NASM 1312-7, is a test method originally developed by the U.S. military to test bolted connections’ resilience against impact and vibration.
Nord-Lock wedge lock washers are proven as a safe bolt securing system according to NASM 1312-7 tests performed by the independent organisation Det Norske Veritas (DNV). To view more certificates and type approvals, please visit Certificates.