Lock nuts and Tab washers are designed specifically for applications where a specific item needs to be fastened and permanently fixed in a position but can also be removed for maintenance. The washer is normally used on the shaft that has a keyway to stop the washer from spinning, the tabs on the washer are bent into the slots on the lock nut to retain the nut in a fixed position.
Eureka Assortments Lock Nut & Tab Washers Kit 135 pc