Keep your fasteners secure with this External Tooth Lock Washer. Made of durable steel with a black oxide finish coating, it provides reliable grip and corrosion resistance. Designed to fit a #10 hole size, it has an outside diameter of .402 inches and a thickness of .021 inches, meeting ASME B18.21.1 specifications. With an inside diameter of .199 inches, it ensures a snug fit for your application. RoHS compliant, this washer is not only efficient but also environmentally friendly. Trust in its quality to keep your assemblies tight and secure.