Thread-Cutting Screw Indented Hex Washer Head Type 1 5/16"-18 Unc X 1/2" L (Head 1/2"Af) Low Carbon Steel Case Hard Trivalent Zinc Plated Ansi B18.6.4-1966 491-P22-1Y
Thread-Cutting Screw Indented Hex Washer Head Type 1 5/16"-18 Unc X 1/2" L (Head 1/2"Af) Low Carbon Steel Case Hard Trivalent Zinc Plated Ansi B18.6.4-1966 491-P22-1Y