5/16-18 Cap Nut Nickel

5/16-18 Cap Nut Nickel . Typically manufactured from either low carbon steel or stainless steel, cap nuts, also referred to as acorn nuts are used to cover exposed bolt ends and add a finished appearance. These carbon steel cap nuts are composed of a hex nut and a top cap manufactured from 1006 to 1010 carbon steel. They are nickel plated for appearance.