An Evolution in Bolt Security

Chicago-based Nord-Lock added a new dimension of safety to bolt security with the launch of the Nord-Lock X-series washer, which combines Nord-Lock’s wedge-locking protection against spontaneous bolt loosening (due to vibration and dynamic loads) with an exclusive spring effect that protects against slackening due to settlement and relaxation. The principle of Nord-Lock X-series washers includes multiple functions that act on the bolted joint to maintain preload and prevent spontaneous bolt loosening. As with Nord-Lock’s original washers, each washer pair has cams on one side and radial teeth on the opposite side to secure the bolted joint with tension instead of friction. The Nord-Lock X-series washers’ conical shape also creates an elastic reserve in the bolted joint to compensate for the loss of preload and prevent slackening. (