Tab Washers are circular washers equipped with one or more protruding tabs designed to prevent rotation of both the washer and the nut within a bolted assembly. These tabs may either lie flat or be bent around the bolt or nut to secure the joint. Depending on the application, tab washers can feature internal or external tabs, which may vary in length—ranging from short to extended styles for added locking capability.

Commonly referred to as “Tab Key Washers,” “Notched Washers,” or “Tab Lock Washers,” these components are typically produced through stamping or laser cutting processes. Adfast Component manufactures tab washers in both metric and imperial dimensions, offering a wide selection of materials and custom configurations. Popular material options include zinc-plated steel, stainless steel grades 304 and 316, as well as Hastelloy C276 and Monel 400.