Back Home / Fasteners / Nuts / HEX NUT UNF ZINC 5/8″-18 GR 8 HEX NUT UNF ZINC 5/8″-18 GR 8 SKU: 8N5818 Categories: Fasteners, Nuts A finished hex nut made from low carbon steel. For use with grade 8 bolts. Proof load: 150,000 psi. Size: 5/8″-18. Yellow zinc plated. A finished hex nut made from low carbon steel. For use with grade 8 bolts. Proof load: 150,000 psi. Size: 5/8″-18. Yellow zinc plated. Case Quantity: 25 Log In For Pricing