Ensure optimal fastening with this External Tooth Lock Washer. Made of durable steel with a zinc finish coating, this washer guarantees long-lasting performance. Compliant with ASME B18.21.1 specifications, it features an outside diameter of .402 inches and a thickness of .021 inches. The precise design includes an inside diameter of .199 inches, perfect for #10 hole sizes. Rest assured of its environmental friendliness with RoHS compliance. Ideal for a wide range of applications, this washer provides essential security for your assemblies.