Abstract: The invention relates to a self-drilling fastening element (10), comprising a rotationally symmetrical drilling tip (16) and a shaft (14), wherein the cross-section of the drilling tip (16) is bounded by a first radius (R2), the origin (22) of which lies outside the rotational axis (18) of the drilling tip (16) on the side opposite the rotational axis (18), near the drilling tip (16), and a second radius (RI) near the shaft (14), wherein the origin (26) of the second radius (RI) is farther from the rotational axis (18) than the origin (22) of the first radius (R2) and likewise lies on the opposite side of the rotational axis (18).

Abstract: A torque-locked connection between a hub or disk (14) and a shaft, a journal or a shank (12), wherein the hub or disk (14) is provided with a profiled passage for the shaft, the journal or the shank (12) and said shaft, journal or shank in turn is provided with a corresponding outside profile (16) and an outside thread (26) following said outside profile (16), said outside thread being used to screw on a nut so as to secure the hub or disk (14), wherein the difference between the outside diameter of the outside thread (26) and the outer surrounding diameter of the profile (16) is no more than 1 mm.

Abstract: The invention relates to a washer (10), screw or nut having an end surface (12) which faces toward a workpiece, wherein the end surface (12) is provided with a concentric, annularly encircling web (14), and that region (18) of the end surface (12) which is situated outside the encircling web (14) tapers conically toward the web (14) from the outside, with the inclination from the outside to the inside being directed away from the workpiece.