The ears are bent up by the user to lock the nut in place.
Tab lock washer.
A lock washer is designed to prevent a secured joint that is fastened with a bolt or screw from turning or loosening in response to shock or vibration.
The tabs lock over the edge of the assembly base or in a predrilled hole.
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.
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Bend the tab of these lock washers against the flats of a hex nut or bolt head to prevent the fastener and washer from turning and loosening.
Tab lock washers are designed to prevent both the washer and the nut from rotating in an assembly.
Split star and tab lock washers are commonly used in airplane manufacturing.
Tab lock washers are available in the following materials and finishes.
Tab lock washers are a type of round lock washer that are generally manufactured with tabs or notches that are designed to fit around bolts and nuts or made to lay flat.