Tab Lock Washer

It can have internal or external teeth for gripping and can be split through one part of the ring.

Tab lock washer.

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 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. The ears are bent up by the user to lock the nut in place. 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.

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. Tab lock washers are available in the following materials and finishes. 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.

Teeth bite into the joint for a tighter grip than split lock washers.