Wheel bearing unit for a motor vehicle as well as method for producing a wheel bearing unit

A method for producing a wheel bearing unit for a motor vehicle, wherein the wheel bearing unit has a wheel hub, a wheel bearing flange, and a wheel bearing for pivot mounting of the wheel hub on the wheel bearing flange, wherein the wheel hub has a passage opening for mounting a shaft journal attached to the wheel hub by a screw connection element, and an inner toothing is formed, on an inner circumferential surface delimiting the passage opening, for rotationally fixed interaction with an outer toothing of the shaft journal, and wherein the passage opening extends through a contact shoulder, which is formed so as to have contact with a contact surface of the screw connection element, with the formation of an orifice, wherein in order to enlarge the contact shoulder, the inner toothing is formed on the inner circumferential surface up to the orifice such that an inner diameter of the orifice corresponds to at least a tip diameter of the inner toothing and is less than a root diameter of the inner toothing, and wherein the inner toothing has a first toothing region present in the orifice and a second toothing region spaced apart from the first toothing region in the axial direction as relates to a center longitudinal axis of the passage opening, between which toothing regions a section of the passage opening is formed with an inner diameter which is greater than the tip diameter of the inner toothing, wherein the shaft journal engages the second toothing region completely and protrudes into the section of the passage opening, but ends spaced apart from the first toothing region.