The HEX NUT UNC ZINC 5/16"-18 GR 5 is a high-quality finished hex nut made from low carbon steel, ensuring strength and reliability. It is specifically designed for use with grade 5 bolts, providing a proof load of 120, making it ideal for various industrial and automotive applications. The zinc coating offers enhanced corrosion resistance, making it suitable for environments where moisture and rust are concerns. Choose this hex nut for dependable performance in your fastening solutions.