Pan head self-tapping is a commonly used  fastener, which is widely used in furniture, electronics, machinery and other fields. It usually consists of two parts, namely, pan head and self-tapping. The disc head is round or hexagonal in shape, which is usually used for decoration and fixation. Self-tapping is a special thread, which can automatically enter the thin plate or wood to play a fixing role.Common surface treatments include:
1. Electroplating: Generally, electroplating includes zinc plating, copper plating（black,yellow,white,blue etc.）, nickel plating, chromium plating, copper nickel alloys, etc. Sometimes, blackening (blueing), phosphating, etc. are also included.
2. Hot dip galvanizing: completed by immersing carbon steel components in a molten zinc plating bath with a temperature of approximately 510 ℃. The result is to gradually transform the iron zinc alloy on the surface into passive zinc on the outer surface of the product.
3. Mechanical plating: Impact the surface of the product by coating metal particles and cold weld the coating onto the surface of the product.

The best part in the use of self-tapping screws is that there is no need to drill holes before they are used. 

The two basic types of self -tapping screws are thread-forming screws and thread-cutting screws. The thread-forming screws are commonly used for plastic, deforming the material as the screws enter. The thread-cutting screws are typically used for wood and metal, removing some of the material and creating a threaded path for the screw. Features of Self-tapping ScrewsSelf-tapping screws with press washer made of galvanized steel for various applications: fastening siding, corrugated board and other sheet materials, as well as fastening various types of profiles from thin sheet steel. * Easy to screw in. * High hardness. * Both high and low temperature resistance. * High tensile strength value. * Various surface treatment for corrosion resistance and rust resistance. * Different choices of colors.* Long service life, durable enough to handle repeated assembly and disassembly. Head highlighting surface treatment:black phosphated tapping point Tip highlighting surface treatment:blanco zinc coated with tapping point