This locknut secures bearings with an adapter or withdrawal sleeve on the shaft, transferring axial clamping force through a threaded connection tightened against the bearing face. Main dimensions follow DIN 981, with a width of 24.0 mm and a net mass of 2.137 kg, giving it the rigidity needed to hold clamping torque without deforming under load. The plain locknut design (KM30) provides a flat bearing surface for a mating lock washer that prevents self-loosening once installed. Fitting requires access to the shaft thread and enough axial space to engage the tab of the washer into the nut slots after tightening, keeping the assembly fixed under vibration and axial thrust during operation.