Back Home / Fasteners / Bolts / HEX CAP SCREW BOLT UNC ZINC 5/16″-18 X 3″, GR 8 HEX CAP SCREW BOLT UNC ZINC 5/16″-18 X 3″, GR 8 SKU: 56X3C8 Categories: Bolts, Fasteners Made from medium carbon alloy steel. Heat treated. Tensile strength: 150,000 psi. minimum. Yellow zinc plated. Unified screw threads :UNC. Diameter: 5/16″-18. Length: 3″. Case Quantity: 50 Log In For Pricing