Ensure secure fastening with this External Tooth Lock Washer. Crafted from durable steel with a black oxide finish coating, it offers reliable protection against loosening and vibration. Designed to ASME B18.21.1 specifications, this washer features an outside diameter of .252 inches and a thickness of .015 inches. With an inside diameter of .119 inches and a hole size of #4, it is suitable for a variety of applications. Rest assured, this washer is RoHS compliant, making it an environmentally friendly choice for your project. Keep your assemblies tight and secure with this essential hardware component.