Secures bearings and other rotating components onto a shaft by clamping against a shoulder or sleeve, transmitting axial load through a threaded connection tightened with a matching lock washer. Main dimensions follow DIN 981, giving a width of 18.0 mm and a net mass of 0.76 kg. The design allows precise axial positioning and easy dismounting during service, since the nut can be unscrewed without damaging the shaft thread. It is intended for use together with an adapter or withdrawal sleeve and a locking washer, which prevents the nut from loosening under vibration or shaft rotation. Suitable for applications where accurate axial fixation of bearing rings is required.