Abstract: A screw with a screw head which has a drive that includes cams that are formed by recesses introduced around the cams. The cams are used to transmit torque, in which, on the cam end facing the screw head, a cam has a cam head surface inclined with respect to a plane that extends perpendicular to the screw axis. The radial extension of the cams is arranged and designed such that the cams center a tool introduced into the screw drive. The cam head surface has a first surface and a second surface, each of which is inclined in its respective rotational direction and which intersect each other in an intersection line.

Abstract: The invention relates to a screw with a screw head having a drive, and a corresponding drive tool, and a drive system having the screw and the drive tool. The screw embodies a screw head having a drive; the drive includes cams formed by recesses introduced in the screw head around the cams. Each cam has two side faces which are used to transmit torque, and an end face connecting the side faces. The end face has a concave surface contour on the end of the screw head facing away from the screw shank. The end face has a virtual circular periphery around the screw axis in a plane perpendicular thereto and having a radius associated with the plane has a point of contact on the cam with the end face. Over at least one portion of the axial height of the end face, a plurality of points of contact form a contact line in the centre of the end face. The drive tool incorporates a basic body having integral entraining elements in a radial extension to the outside.

Abstract: A screw with a screw head which has a drive that includes cams that are formed by recesses introduced around the cams. The cams are used to transmit torque, in which, on the cam end facing the screw head, a cam has a cam head surface inclined with respect to a plane that extends perpendicular to the screw axis. The radial extension of the cams is arranged and designed such that the cams centre a tool introduced into the screw drive. The cam head surface has a first surface and a second surface, each of which is inclined in its respective rotational direction and which intersect each other in an intersection line.