This locknut secures bearings with a matching adapter sleeve or shaft thread against axial movement, providing a defined clamping position on the shaft. Main dimensions follow DIN 981, with a width of 15.0 mm and a net mass of 426.28 g, giving a compact ring designed to be tightened onto the threaded seat and locked in place with a corresponding lock washer. Its design allows precise axial positioning of the bearing inner ring, which is useful where a fixed location on the shaft must be maintained without additional spacers. The locknut is installed by hand or with a suitable wrench and tightened to the required position, after which the lock washer tab is bent into the nut slot to prevent loosening under vibration or load. It is intended for use with shafts machined to the corresponding thread standard, matching the KM16 designation.