The invention relates to an open-end spinning rotor (1) which is characterized in that the rotor shaft (2) thereof is provided with a peg-shaped shaft end (7) having a reduced diameter (d). The shaft end (7) has a front-end support surface (16) that can be associated with a step bearing (8) and that is provided with a long-wearing insert (17). The reduced diameter (d) of the peg-shaped shaft end (7) is at least 0.68 times the diameter (D) of the rotor shaft. The reduced diameter (d) of the shaft end further is at least 0.82 times the length (L) of the peg-shaped shaft end (7).
