This ISO 4032 hex nut is made of steel with a hot-dip galvanized finish. Rated at strength class 8, it's designed to pair with bolts and screws of strength class 8.8 or lower. The threads are metric and manufactured to a 6H tolerance class. This nut should be used with externally threaded fasteners—such as bolts and threaded rods—that have a 6az tolerance class prior to galvanizing. Because the threads are tapped after galvanizing, they don't carry a zinc coating themselves; corrosion protection is instead provided by the zinc layer on the mating component.