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Self-drilling screw is a screw that can tap its own hole as it is driven into the material. For hard substrates such as metal or hard plastics, the self-drilling ability is often created by cutting a gap in the continuity of the thread on the screw, generating a flute and cutting edge similar to those on a tap. Thus, whereas a regular machine screw cannot tap its own hole in a metal substrate, a self-drilling one can (within reasonable limits of substrate hardness and depth).

self drilling screw

Item
Galvanized Hex Self Drilling Screws/  Self Tapping Screws for Wood
Material
22A Fine Carbon Steel
Standard
DIN GB ISO JIS BA ANSI
Color
White zinc, blue,  yellow zinc…
Drill No.
#3,#4,#5
Thickness
6#,7#,8#,10#,12#,14#.