variations of the invention fig1 shows an section through an open end spinning device equipped according to the invention the essential components are the spinning rotor 1 with its shaft 11 and the rotor plate 12 the rotor housing with the rotor housing seal 21 the bearing block 3 with a seat 31 for the axial bearing 6 and a seat 32 for the support of the supporting disks 4 as well as the supporting disks 4 themselves in addition the drive means 5 a tangential belt and the axial bearing 6 for axial support of the rotor shaft 11 are shown the rotor shaft 11 extends with its end bearing the rotor plate 12 into the rotor housing through the bore of the rotor housing seal 21 the axial bearing 6 is located in an adjusting screw 61 and is facing the free end 111 of the rotor shaft 11 the seat 31 is provided with a bore with threads into which the adjusting screw is adjustably screwed in the axial direction to set the adjustment a counter nut is used at the other end of the adjusting screw 61 the connection 62 for the arrival of compressed air to the axial bearing 6 is installed the bearing gap 630 extends between it and the shaft end 111 an axial force which bears upon the free end 111 of the rotor shaft 11 is applied in a known manner to spinning rotors of open end spinning devices of this type the axial force exerted upon the rotor or rotor shaft is applied in a known manner by supporting disks 4 set at an angle in the open end spinning device shown in fig1 it.