Abstract: Rotationally symmetrical force-application means with, as viewed axially, a star-shaped outer contour or inner contour, for connecting elements, wherein the individual arms of the star are designed as pointed arcs, of which the outer points lie on a common outer circle, wherein an associated counterpart, in particular a bit, insert or screw head, has a mating contour which is adapted to the contour of the force-application means such that the radii of the flanks of the force-application means and the counterpart end up butting against one another in such a manner as to achieve a planar pressing surface.

Abstract: This invention relates to a self-locking screw (16; 116) in which the flanks (18; 118), which are loaded when the screw (16; 116) is screwed, are provided with an arched portion (20; 120).

Abstract: Rotationally symmetrical force-application means with, as viewed axially, a star-shaped outer contour or inner contour, preferably for connecting elements, wherein the individual arms of the star are designed as pointed arcs, of which the outer points lie on a common outer circle, wherein an associated counterpart, in particular a bit, insert or screw head, has a mating contour which is adapted to the contour of the force-application means such that the radii of the flanks of the force-application means and the counterpart end up butting against one another in such a manner as to achieve a planar pressing surface.

Abstract: This invention relates to a self-locking screw (16; 116) in which the flanks (18; 118), which are loaded when the screw (16; 116) is screwed, are provided with an arched portion (20; 120).

Abstract: The invention relates to a method for setting connecting elements (16), such as screws or blind rivets, which are self-drilling without chip formation, in one or more plates, wherein the plate(s) are heated by electrical energy shortly before the start of the setting process, wherein the heating is accomplished by means of an induction coil (26), which is arranged near a point on the plate(s) at which the connecting element (16) is set. The invention further relates to a device (10) for setting a connecting element (16), which is self-drilling without chip formation, in one or more plates, comprising an induction coil (26), which at least before and/or during the setting process is arranged near a point on the plate(s), at which the connecting element (16) is set.

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).