Patent ID: 7785055

Claim:
A screw comprising a threaded shank with a torque application feature for transmitting torque and a screw tip, the threaded shank being composed of a shank core and a thread-forming thread, and the thread being formed as an elevation which extends helically over the shank core, and forms two flanks which converge at an outer thread edge and has a height H measured radially from the shank core to the thread edge, the thread having, as viewed in radial profile, at the thread edge a specific apex angle α formed between the adjacent flanks, at least one of the two flanks of the thread is formed concavely in the region between the shank core and the thread edge, as viewed in radial profile, in such a way that the apex angle α is less than a flank angle α F defined between imaginary straight flank lines FG formed by a lowest point GF of the thread and the thread edge, wherein one or both of the flanks extend initially in a straight line from the shank core, corresponding to the straight flank line FG, and only extends concavely from a specific flank height h F .