Abstract: A rolling die for forming a screw thread on a screw blank is disclosed. The rolling die has a plurality of grooves, where the grooves each have two flanks as seen in cross-section. At least a portion of each of the grooves has a forming area in which the size of a profile angle enclosed by the flanks decreases continuously along the grooves.

Abstract: The inventive method of forming anchors comprises following steps. A rod-shaped workpiece is roll-formed by penetrating the rod-shaped workpiece with two wedge-shaped tools at two points. The two points are arranged on opposite sides and axially separated of a plane perpendicular to an axis of the rod-shaped workpiece. The two wedge-shaped tools are axially approaching to the plane while the rod-shaped workpiece is revolved around the axis. The roll-formed workpiece is separated along the plane for forming two bolts. A sleeve is applied around the anchor bolts.

Abstract: A method for manufacturing a thread-forming screw having a shank and a thread formed in one piece with the shank and region-wise circumferentially arranged on the shank, is disclosed. After the formation of the thread on the shank, a plurality of recesses is subsequently stamped into the thread. Then, a plurality of compact cutting elements is welded into the recesses in the thread, where the cutting elements are made of a hard material and have a hardness greater than the hardness of the thread. Additionally, a stamping device for carrying out the method is also disclosed.

Abstract: The inventive method of forming anchors comprises following steps. A rod-shaped workpiece is roll-formed by penetrating the rod-shaped workpiece with two wedge-shaped tools at two points. The two points are arranged on opposite sides and axially separated of a plane perpendicular to an axis of the rod-shaped workpiece. The two wedge-shaped tools are axially approaching to the plane while the rod-shaped workpiece is revolved around the axis. The roll-formed workpiece is separated along the plane for forming two bolts. A sleeve is applied around the anchor bolts.

Abstract: A screw (11) has a shaft (12), a thread (13) which is arranged in at least some areas over the circumference of the shaft (12) and which defines a helix (14), and cutting bodies (26; 36; 46; 56, 66) made of a material having hardness greater than the hardness of the thread (13) and arranged in recesses (20, 21) of the thread (13), with the cutting bodies (26; 36; 46; 56, 66) having their longitudinal extension oriented along the helix (14) so that their longitudinal axes (27; 37; 47; 57, 67) enclose an angle (A; B; C; D, E) of ?35° to +35° with the respective tangents of the helix (14).

Abstract: A fastening element has a shaft (12), and a tapping thread (21) carried by the shaft (12) and having at least one screw thread (22, 42) a section (23; 43) of which that adjoins the thread pilot (35), having a plurality of following one another thread steps (24, 25, 26, 27; 44, 45, 46, 47) having different cross-sections, with a cross-section of the at least one screw thread (22; 42) decreasing stepwise toward the thread pilot (35) from a thread step (24, 25, 26, 27; 44, 45, 46, 47) to a thread step (24, 25, 26, 27; 44, 45, 46, 47), with the thread steps (24, 25, 26, 27; 44, 45, 46, 47) having respective cutting edge-forming end surfaces (28, 29, 30, 31; 48, 49, 50, 51) aligned, at least partially, in a direction of the thread pilot (35).

Abstract: A method for manufacturing a thread-forming screw having a shank and a thread formed in one piece with the shank and region-wise circumferentially arranged on the shank, is disclosed. After the formation of the thread on the shank, a plurality of recesses is subsequently stamped into the thread. Then, a plurality of compact cutting elements is welded into the recesses in the thread, where the cutting elements are made of a hard material and have a hardness greater than the hardness of the thread. Additionally, a stamping device for carrying out the method is also disclosed.

Abstract: A screw (11) has a shaft (12), a thread (13) which is arranged in at least some areas over the circumference of the shaft (12) and which defines a helix (14), and cutting bodies (26; 36; 46; 56, 66) made of a material having hardness greater than the hardness of the thread (13) and arranged in recesses (20, 21) of the thread (13), with the cutting bodies (26; 36; 46; 56, 66) having their longitudinal extension oriented along the helix (14) so that their longitudinal axes (27; 37; 47; 57, 67) enclose an angle (A; B; C; D, E) of ?35° to +35° with the respective tangents of the helix (14).

Abstract: A fastening element has a shaft (12), and a tapping thread (21) carried by the shaft (12) and having at least one screw thread (22, 42) a section (23; 43) of which that adjoins the thread pilot (35), having a plurality of following one another thread steps (24, 25, 26, 27; 44, 45, 46, 47) having different cross-sections, with a cross-section of the at least one screw thread (22; 42) decreasing stepwise toward the thread pilot (35) from a thread step (24, 25, 26, 27; 44, 45, 46, 47) to a thread step (24, 25, 26, 27; 44, 45, 46, 47), with the thread steps (24, 25, 26, 27; 44, 45, 46, 47) having respective cutting edge-forming end surfaces (28, 29, 30, 31; 48, 49, 50, 51) aligned, at least partially, in a direction of the thread pilot (35).