KM Locking Nuts are often referred to as bearing nuts, shaft nuts of withdrawal nuts. They are commonly used in conjunction with suitable tab washers to securely locate bearings and other components onto a shaft. They can also be utilised when mounting taper bore bearings onto shafts.
Friction heats up and softens the nylon insert during installation, allowing it to be deformed by the thread of the screw. As this cools down, the nylon insert hardens, locking the fastener into position.