Patent ID: 7338243

Claim:
A thread-cutting screw ( 1 ), suitable for use as a concrete screw, for being screwed into the bore-hole wall ( 1 a ) of a bore hole ( 1 b ), comprising a substantially cylindrical core ( 2 ) of metal with a central longitudinal axis ( 4 ); a thread ( 5 , 5 ′, 5 ″) which forms one piece with the core ( 2 ); at least one cutting element ( 6 , 7 ) which is disposed within the thread ( 5 , 5 ′, 5 ″) for cutting engagement with the bore-hole wall, with the core ( 2 ) consisting of a metal having a carbon content in a range between greater than 0 and 0.5 percent by weight, and with the at least one cutting element ( 6 , 7 ) being fixedly connected to the core ( 2 ); wherein the at least one cutting element ( 6 , 7 ) is a welded structure, united with the thread ( 5 , 5 ′, 5 ″), of a metal with a carbon content that exceeds 0.8 percent by weight.