Enhance the security of your fastening applications with this External Tooth Lock Washer. Crafted from durable steel and designed to meet ASME B18.21.1 specifications, this washer ensures reliable performance. Featuring an outside diameter of .402 inches, an inside diameter of .199 inches, and a thickness of .021 inches, it is suitable for #10 hole sizes. Rest assured of its compliance with RoHS regulations. Upgrade your assembly processes with this essential component for preventing loosening and maintaining tight connections.