This hex nut with pipe thread is manufactured to DIN 431-B specifications and is widely used in mechanical engineering applications. It features a single-sided chamfer and a cylindrical pipe thread. The material is bright steel—uncoated steel with no surface treatment. While this material is strong, it offers little inherent protection against corrosion. The hardness class is 14H, meaning the nut has a minimum hardness of 140 HV. No proof load has been established for this hardness class.