outside of the clamping element 8 has at least one and preferably two essentially cylindrical jacket surface sections 15 16 between which a clamping section 17 is arranged the clamping section 17 exhibits a profile that is not circular one such example is illustrated on fig4 in the present case it consists of two cylindrically bent cam surfaces 18 19 the radii r of which relate to midpoints m 1 m 2 which each are spaced apart from the rotational axis 10 the cylindrical section of the borehole 7 is followed by an allen wrench segment 20 bordered hexagonally or on multiple surfaces the mold clamping profile can also be a front claw profile the latter is used for placing an allen wrench in order to twist the clamping element 8 against the machine element 2 the hub 9 is correspondingly provided with a mold clamping profile 21 for example in the form of a toothed profile or notched profile which is also suitable for the placement of a torque generating tool such as a clamping system or the like the allen wrench section 20 and mold clamping profile 21 are separately displayed on fig3 this figure illustrates the hub 9 and a portion of the disk shaped section 11 enveloping it based on the example of the pulley 3 the machine element 2 is manufactured as follows the pulley 3 is manufactured.