Patent ID: 8322959

Claim:
A self-boring screw comprising a screw shaft and a boring section provided at a free end of the screw shaft, the boring section including a boring tip and boring blades set at an obtuse angle to each other defining a drill radius adapted to form a hole for engagement with a thread on the screw shaft, one or more vanes set at an axial distance from the boring tip that project perpendicularly in reference to an axis of the shaft, with a border of the one or more vanes facing the boring tip each being embodied as a vane boring blade that is adapted to form a clearance hole for the thread on the screw shaft so that a clearance space is provided between an outside of the thread and the inside of the clearance hole, a part of a tip of the screw shaft adjacent to the boring section is embodied as a frustum, and with the boring section comprising a chip discharge zone in an area between the vane or the vanes and the part of the tip embodied as the frustum, the part ( 5 b ) of the tip ( 5 ) of the screw shaft ( 4 ) embodied as the frustum being arranged above the vane or the vanes ( 12 ) and edges of the vane or the vanes ( 12 ) facing the boring tip ( 8 ) form an intersection (S) with the drill radius ( 16 ) that is an axial distance (A) from a bottom of the part ( 5 b ) of the tip ( 5 ) of the screw shaft ( 4 ) embodied as the frustum that defines a minimum width of a chip discharge zone ( 14 ) which is equivalent to ⅔ of a length of a cutting edge of one of the boring blades.