Lock nuts with an integral locking device
KMK series lock nuts (fig. 1) have a threaded steel insert in their bore to lock the nut in place on the shaft or adapter sleeve. The threads on the insert match the lock-nut threads. The insert acts as a pressure plate when a grub screw, which runs through the body of the lock nut, is tightened (fig. 2). KMK lock nuts are intended to locate radial bearings in less demanding applications.
KMK lock nuts should not be used on shafts or adapter sleeves with keyways or key slots. Damage to the locking device can result if it aligns with a keyway or slot.