This lockwasher with hook tab is a locking device used to secure AN and N lock nuts onto a shaft or adapter sleeve and prevent unintentional loosening. The lockwashers engage a keyway in the shaft or adapter sleeve thread. They lock the nut in position when one of the washer tabs is bent into one of the slots in the outside diameter of the lock nut. A new lockwasher should be used each time the corresponding locknut is installed.
