The ears are bent up by the user to lock the nut in place.
Tab lock washer.
The tabs lock over the edge of the assembly base or in a predrilled hole.
Tab lock washers are designed to prevent both the washer and the nut from rotating in an assembly.
Tab lock washers are available in the following materials and finishes.
Split star and tab lock washers are commonly used in airplane manufacturing.
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Teeth bite into the joint for a tighter grip than split lock washers.
Tab lock washers bend one tab against the side of the mounting surface and the other tab against the flats on a bolt or nut to prevent both the fastener and washer from turning and loosening in high vibration applications such as a motor mount.
It can have internal or external teeth for gripping and can be split through one part of the ring.
They work to lock a part in place and are most often used in applications where there are drastic heat conditions or heavy vibrations.