Acorn nut (domed cap nut) is a hex nut with an integrated dome cap. It can fully cover the exposed thread end of bolts. It protects threads from dust, moisture and corrosion, meanwhile prevents sharp thread ends from scratching people or parts. It has both fastening, protective and decorative functions. Widely used in railings, furniture, vehicles, mechanical equipment and architectural metal structures. Available in carbon steel, stainless steel A2/A4; surface options: zinc plating, black oxide, hot-dip galvanizing.