For torque transmission, for example between an articulated shaft and a hub to a drive motor vehicle wheel, it is necessary to non-rotatably couple the articulated shaft or a corresponding intermediate piece and the hub to each other. For this purpose, a coupling element (3), particularly a hub element, is proposed for transmitting torque about a rotational axis (10) that is oriented in an axial direction and has a serration (11), which extends in the peripheral direction about the rotational axis (10), wherein the serration (11) has a plurality of teeth (15), each tooth (15) being configured in the manner of a triangle in a longitudinal section along the peripheral direction such that two tooth faces (17) are formed, which end in a tooth head region (16), and at least one of the tooth faces (15) being configured convexly in the longitudinal section with respect to an imaginary straight reference tooth face (20a, b).