Patent ID: 8613579

Claim:
A self-drilling screw ( 10 ), comprising a shaft ( 11 ) provided with a thread ( 13 ) at least in some regions thereof and defining a longitudinal axis; a drilling tip ( 12 ) provided at one end of the shaft ( 11 ); a head ( 15 ) provided at another, opposite end of the shaft ( 11 ); a first cutting edge ( 21 ) provided exclusively in a radially inner region of the drilling tip ( 12 ), defining a first enveloping conical circumferential surface (A 1 ), and extending at a first acute angle (α 1 ) to the longitudinal axis (L); and a second cutting edge ( 22 ) provided in a radially outer region of the drilling tip ( 12 ) defining a second enveloping conical circumferential surface (A 2 ), and extending at a second acute angle (α 2 ) to the longitudinal axis (L), wherein the first cutting edge has a radially outer region ( 23 ) which is not equal to the second cutting edge ( 22 ), and the second cutting edge ( 22 ) having a radially inner region ( 24 ) which is not equal to the first cutting edge ( 21 ).