Patent ID: 7677854

Claim:
A self-boring and self-tapping screw comprising a screw shaft with a screw tip at one end extending axially to a force application member for the transmission of a turning torque at the other end, the screw shaft including a threaded section disposed between the screw tip and a thread-free section of the shaft, the thread-free section including the force application member, the threaded section including a shaft core and a thread, the threaded section further includes a core section axially displaced from the screw-tip, the core section has a polygonal core cross section with corners defining an enveloping circle having an enveloping circle diameter larger than a shaft diameter of the thread-free section of the shaft; wherein the thread runs along the entire core, including the polygonal core section, and the polygonal core section is provided within the threaded section adjacent the thread-free section of the shaft.