Countersunk head self-drilling screws

Drill tail screw is a kind of self-tapping screw. It is named because the tail of the screw has a drill tail tip, and the tip is like a twist drill bit. The standard name is self-drilling self-tapping screw, and it is also called dovetail screw in the industry. The drill-tail screw can drill the center hole by itself during assembly, and then self-tapping and extruding the matching thread in the hole on the carrier with the help of the adjacent threaded part, without auxiliary processing, drilling, tapping, locking Completed at one time, greatly saving assembly time.

Drilling screws are divided into carbon steel drilling screws and stainless steel drilling screws according to the material. Commonly used stainless steel materials are SUS201, SUS304, SUS316 and so on.

SUS304 stainless steel drill tail screw, SUS304 has strong anti-rust ability, no need for heat treatment, although it has good corrosion resistance, but the mechanical performance is not high, so pay attention in use: it cannot be used for stainless steel plate, its hardness is low, suitable for drilling Aluminium, plywood and wood.

Carbon steel drill screws, 1022A standard heat-treated steel can be used as the production material for drill screws. After heat treatment, the surface hardness is HV560-750, and the core hardness is HV240-450. With ordinary surface treatment, it is easy to rust, high hardness and low cost.