Hex washer head tapping screw 1.Screw size:ST2.2-ST9.5, #0-# ... ,HDG,black oxide Features: Galvanzized/Zinc Plated Indented Hex washer Head socket Tapping Screw 1.tapping screw Standard DIN6928,JIS B1123 ... . Head type pan head,oval head, Flat head,Truss head,Hex Indent Washer Head, Fillister Head, Round Washer5. Drive systems philips, hex indent, hexgonal socket, Slotted square, and ...