WHAT IS NORD LOCK WASHER?
Nord-Lock created the original wedge-locking technology that secures bolted joints, even when exposed to severe vibration and dynamic loads. It is impossible for our products to loosen unintentionally due to the wedge created underneath the bolt head and nut.
HOW IT WORKS?
Since the cam angle (alfa) is larger than the thread pitch (beta) any rotation of the bolt/nut is blocked by the wedge effect of the cams.
VIBRATION TEST
The Junker vibration test complying to DIN 65151 is an excellent method for testing and comparing the security of bolted joints. The following diagram displays NORD-LOCK's superior performance in maintaining clamp load, and the unique wedge locking function of the NORD-LOCK washers is proven by the clear increase in clamp load during untightening.