WHAT IS CONSTRUCTION WASHER?
Nord-Lock steel construction (SC) washers are specially designed to fit both HV and HR bolts and nuts, and directly replace standard plain chamfered washers (EN 14399-6).
In order to ensure an optimal contact surface between the bolt and the washer, each SC-washer pair has chamfers on the inner diameter. Since the chamfer is present on both sides of each pair, it eliminates the risk of incorrect installation of the washer.