Tapping drilling screws

This "drlling tapping self drilling screw, also known as" drlling screw ", "drlling screw", "self drilling screw," the north is also called "dovetail screw". English name: SELF DRILLING SCREWS. Its execution standard GB/T 15856.1-2002, Germany standard DIN7504N - 1995, JIS B 1124-2003.

This tapping from drilling screw drill with the tail, named tip like twist drill, screw during assembly to drill out the center by Confucius, and then with the aid of Lin threaded portion near the hole tapping on the carrier.