Name self-tapping screws Material stainless steel, carbon steel, alloy steel, brass and so on Size M2 *5-M8 *200mm Surface treatment zinc, black phosphate, dacromet, ruspert, mechanical gal. polish nickel and so on Head Type flat head, pan head, hex head, cylinder head, wafer head Drive philips, pozi, socket, hex, square, torx, solloted, combined Grade C10B21, C1022, SUS201, SUS304, SUS316, A2-70, A2-80, A4-80, 4.8 8.8 10.9 12.9 Thread Full thread, partical thread, double thread, Trilobular thread