Abstract: Flat gasket with a gasket plate which has at least one screw hole for the passage of the threaded shaft of a screw and is formed in the region of this screw hole by a sheet-metal layer, the sheet-metal thickness of which would make an engagement of the sheet-metal layer in a thread of the threaded shaft possible, wherein for the secure centering of the threaded shaft in the screw hole the sheet-metal layer has in its edge region bordering on the screw hole at least one centering element which is formed by the sheet-metal layer and bent out of its plane and prevents any engagement of the sheet-metal layer in a thread, the centering element being designed such that it can be bent back at least approximately into the plane of the sheet-metal layer during the tightening of the screw.

Abstract: Gasket with at least one sheet-metal layer which has at least one screw hole for the passage of the threaded shaft of a screw, wherein for a secure holding against loss of the screw in the screw hole the sheet-metal layer is designed such that several holding tongues integral with the sheet-metal layer project from the edge of the screw hole, define a circular core hole, the diameter of which corresponds to the core diameter of the screw thread, and are designed for engagement in the screw thread, and that at least some of the holding tongues are bent out of the plane of the sheet-metal layer in such a manner that the edge regions of the holding tongues facing the center of the hole are arranged so as to be offset relative to one another in axial direction of the screw hole in accordance with the pitch of the screw thread.

Abstract: A screw-sleeve element has a screw having a screw shaft and a threaded region formed so that the screw shaft has a smaller diameter than an outer diameter of the threaded region; and a sleeve provided at an inner side with a narrow location having a diameter which is smaller than the outer diameter of the threaded region of the screw, so that the sleeve is non releasably arranged on the screw.