Enhance the security of your fastening systems with our External Tooth Lock Washer. This ASME B18.21.1 compliant washer is meticulously crafted from durable steel with a protective phosphorus coating for added longevity. With an outside diameter of .501 inches, an inside diameter of .262 inches, and a thickness of .025 inches, it's designed to fit snugly around a 1/4 inch hole, providing essential locking functionality. Rest assured, this washer meets RoHS compliance standards, making it a sustainable choice for your projects. Elevate the integrity of your assemblies with this essential hardware component.