This hex nut is manufactured to ISO 4032 standards from bright steel—raw steel without any coating or surface treatment. While the material is strong, it offers little inherent protection against corrosion. Rated at strength class 6, the nut is designed for use with bolts and screws of strength class 6.8 or lower. It features a metric thread with a left-hand (LH) direction, which is primarily used on clockwise-rotating components to prevent loosening.