Nord-Lock's wheel nut eliminates unintentional loosening of wheel nuts by maintaining a high clamp force even under severe operating conditions. Based on proven wedge-locking technology, the nut is designed for both on- and off-road vehicles. It suits standard flat-faced steel rims, M22x1.5 studs and is easy to install. Each nut incorporates a pair of washers that have cam faces on one side, with a cam angle greater than the thread pitch. On the opposite side are radial teeth. When the wheel nut is tightened, the teeth of the washers 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 Nord-Lock wheel nut cannot loosen by itself, says the company.