Thread-Cutting Screw Type 1 Indented Hex Head 5/16"-18 Unc X 1" Lg (Head 1/2" Af) Low Carbon Steel Case Hard Trivalent Zinc Plated Ansi B18.6.4-1966 491-P31-1X
Thread-Cutting Screw Type 1 Indented Hex Head 5/16"-18 Unc X 1" Lg (Head 1/2" Af) Low Carbon Steel Case Hard Trivalent Zinc Plated Ansi B18.6.4-1966 491-P31-1X