The HEX NUT UNF ZINC 5/8"-18 GR 8 is a durable finished hex nut made from low carbon steel, specifically engineered for compatibility with grade 8 bolts. With a proof load of 150, this nut ensures secure fastening and enhanced performance in demanding industrial and automotive applications. Its UNF thread type offers a precise fit, making it ideal for various assembly needs where strength and reliability are paramount. The zinc plating provides additional corrosion resistance, ensuring longevity even in harsh environments.