Self tapping screws are most often used to fasten sheet metal composite materials, woods and plastics. They have a high tensile strength value, and are durable enough to handle repetead assembly and disassembly. There are two different kinds of self tapping screws: thread forming and thread cutting.
1. Meterial: Stainless steel; Steel C1022,C1018. 2. Head: Hex head, Hex washer head, Pan head, Flat head, Truss head, Oval head. 3. Recess: Philips, Pozi, Slot, Torx, Hexundercut, Square. 4. Diameter: #4-#14. 5. Length: 3/8" - 5". 6. Zinc plated 3 - 5 my or 5 - 8 my.