Patent ID: 8622672

Claim:
A self-piercing hollow press-in element ( 10 ) having a central bore, an axial height and a thread cylinder within said central bore and extending over said axial height, the press-in element being for attachment to a sheet metal part ( 40 ), wherein the press-in element ( 10 ) further has a flange part ( 12 ) having a flange diameter (D 1 ) and a shaft part having a length and a shaft diameter (D 2 ) smaller than the flange diameter (D 1 ), with the shaft part ( 14 ) extending away from the flange part ( 12 ) and having a circular piercing edge ( 18 ) at its end face ( 16 ) remote from the flange part, wherein a side of the flange part ( 12 ) facing the shaft part forms a sheet metal contact surface ( 22 ) in ring shape and there being ribs ( 24 ) providing security against rotation provided at the shaft part ( 14 ) which extend approximately from the level of the sheet metal contact surface ( 22 ) over a part of the length of the shaft part ( 14 ) along the latter wherein a ring recess ( 26 ) is provided radially within the ring-shaped sheet metal contact surface ( 22 ) in the flange part ( 12 ), and wherein material projections ( 28 ) of the shaft part ( 14 ) which arises during manufacture of the ribs ( 24 ) are located within the ring recess ( 26 ).