Back Home / Fasteners / Screws / SHEET METAL SCREW HEX WASH HD #20 X 1″ SHEET METAL SCREW HEX WASH HD #20 X 1″ SKU: 20X1H Categories: Fasteners, Screws A thread forming tapping screw with spaced threads and a gimlet point. For self starting in thin metal or resin-filled plywood. Has an indented top surface, six flat sides with a flat washer which projects beyond the sides and provides a flat bearing surface. The washer and head are formed together as one piece. (Hex washer head) Increased bearing area reduces likelihood of crushing mating surfaces. Zinc plated steel. Screw diameter 5/16 Screw length 1 inch Case Quantity: 100 Log In For Pricing