Self Drilling Screw according to the material can be divided into:
. C1022 self drilling screw
. Stainless Steel 410 self drilling screw
. Stainless steel 304 self drilling screw
1. C1022 self drilling screw, standard heat treatment of steel can be used as the drlling screw production material, heat treatment after surface hardness HV560-750, the core hardness HV240-450. The general surface treatment is easy to rust, high hardness, low cost.
2. Stainless Steel 410 self drilling screw, heat treatment, rust resistance is better than carbon steel. Worse than stainless steel.
3. Stainless steel 304 self drilling screw, do not do heat treatment, antirust capability, low hardness, high cost, can only drill aluminum plate, board, plastic board.
4. Composite self drilling screw drill bit is made from carbon steel, screw thread and the head by combined process of 304 stainless steel production.
Executable GB, DIN, ISO, JIS, ANSI/ASME, etc.