BMG’s range of Nord-Lock bolt securing systems includes the X-series washers, designed to secure bolted joints exposed to severe vibration and dynamic loads. The wedge-effect design prevents spontaneous bolt loosening and the system’s integrated spring effect 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 of these washers creates an elastic reserve in the bolted joint to compensate for the loss of preload and prevent slackening.
Advances in polymers and sandwich composite technology have the advantage of strength to weight ratio and corrosion resistant properties that make applications lighter, without losing strength; but these materials are softer than metal materials previously used and make slackening an additional challenge. The multifunctional wedge-locking concept of the X-series combats these problems.
Surface treatments, which are common for corrosion protection, can also lead to slackening as the bolt sinks into the treated surface after tightening. Even a thin millimetre surface would normally put bolts at risk, but with the compensating spring of the X-series, slackening is prevented. The combined tension and spring action combats the effects of surface treatments, thermal cycling and vibration.
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 secure bolts from both critical loosening factors – spontaneous loosening and slackening – at once.
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