BMG’s Nord-Lock bolt securing system is based on advanced wedge-locking technology, and is designed to safely secure bolted joints that are exposed to severe vibration and dynamic loads in extreme conditions – including the railways industry. Nord-Lock wedge-locking washers ensure there is no bolt loosening in safety-critical areas of railway bogies, coupling devices, brake systems, rail dampers and housings. They improve personal safety, reduce the risk of lost production or material damage due to bolt failure, and lower maintenance requirements.
The multi-functional design offers the highest security against spontaneous bolt loosening and slackening – even at the highest levels of vibration caused by rail traffic, which normally puts bolted joints at risk. The wedge-locking construction is enhanced by an integrated spring effect that compensates for the loss of preload due to slackening. Nord-Lock washers are used by many rail companies globally to replace conventional locking-wire mechanisms on wheel sets, providing maximum bolt security. They are quick and easy to install and remove with standard tools, and have been certified by TV, a leading international institute in quality and safety certification.
Each washer pair has cams on one side and radial teeth on the opposite side to secure the bolted joint with tension rather than friction. The conical shape of these washers creates an elastic reserve in the bolted joint to compensate for the loss of preload and prevents slackening. These multiple functions continuously act on the bolted joint to maintain preload and prevent spontaneous bolt loosening, providing an effective solution for vibration, dynamic loads, settlement and relaxation.
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