Back Home / Fasteners / Nuts / HEX NUT UNC ZINC 5/16″-18 GR 5 HEX NUT UNC ZINC 5/16″-18 GR 5 SKU: N5618 Categories: Fasteners, Nuts A finished hex nut made from low carbon steel. For use with grade 5 bolts. Proof load: 120,000 psi. Size: 5/16″-18. Zinc plated. A finished hex nut made from low carbon steel. For use with grade 5 bolts. Proof load: 120,000 psi. Size: 5/16″-18. Zinc plated. Case Quantity: 100 Log In For Pricing