Lock nuts are used to locate bearings and other components onto a shaft or adapter sleeve. They

are also used for mounting bearings on tapered shaft seats and dismounting bearings from

withdrawal sleeves. Lock nuts have to be secured to prevent unintentional loosening. This is

done, either by a locking device that engages a key way in the shaft or key slot in the adapter

sleeve, or by a locking mechanism integrated in the nut. Lock nuts with an integrated locking

mechanism reduce the cost of the shaft as no key way is required. Installation is also quicker and

easier because no separate locking device is necessary. However, the loosening torque of these

lock nuts requires more attention.

The product codes for locknuts start with HM or KM.

Lock nuts of types KM, KML or HM, HML, and HMLL have four grooves on their outer diameter. By

contrast, the HM 30.. and HM 31.. ranges have eight grooves on their outer diameter and eight

thread bores for securing a locking clip.