Nord-Lock wheel nuts safely secure wheels by maintaining a high clamp force even under severe operating conditions. Each nut has a pair of washers that have cam faces on one side, with a cam angle “α” greater than the thread pitch “β”. On the opposite side are radial teeth. As the wheel nut is tightened, the washer’s teeth grip and lock the mating surfaces, allowing movement only across the cam faces. Any rotation of the wheel nut is blocked by the wedge effect of the cams. Once tightened, the wheel nut cannot loosen by itself. The reusable wheel nuts are prelubricated for uniform friction and accurate preload during tightening.