BMG has extended its range of Nord-Lock bolt securing systems to include the X-series washers, which safely secure bolted joints exposed to severe vibration and dynamic loads. The wedge-effect design prevents spontaneous bolt loosening and an integrated spring effect in the system compensates for the loss of preload due to slackening.
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 creates an elastic reserve in the bolted joint to compensate for the loss of preload and prevents slackening. The combined tension and spring action of X-series washers combats the effects of surface treatments, thermal cycling and vibration. The washers, which are quick and easy to install and remove with standard tools, have been certified by TV, a leading international institute in quality and safety certification.
All bolted joints have a functional preload range in which the joint is safe. Serious problems start as soon as the preload falls outside the functional range. If the preload is too high, yielding occurs. If it is too low, there is separation or sliding between the parts. Independent tests show this series performs better than conventional washers when compensating slackening in static conditions and in preventing rotation of the fastener when the joint is exposed to vibration in the dynamic phase. These are the only washers currently available that can immediately secure bolts from both critical loosening factors – spontaneous loosening and slackening.
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