Locknut KM17 secures bearings and other components on a shaft against a locating shoulder, transferring axial load through a threaded connection tightened with a matching lock washer. Main dimensions follow DIN 981, with a width of 16.0 mm and a net mass of 488.6 g. The DIN 981 geometry keeps the locknut interchangeable within standard shaft-locking assemblies of this size, allowing it to be paired with the corresponding lock washer for controlled axial fixation. Its solid steel body handles the clamping torque needed to hold bearing rings firmly in position along the shaft, making it a straightforward mounting component rather than a rotating part requiring lubrication or sealing.