Enhance the security of your fastening applications with our External Tooth Lock Washer. Designed to prevent loosening and maintain tight connections, this washer is a reliable component for various industrial and mechanical systems. Made from durable Phosphor Bronze material, it offers excellent resistance to corrosion and wear, ensuring long-lasting performance. With an ASME B18.21.1 specification, you can trust in its quality and precision. The washer features an outside diameter of .402 inches and a thickness of .021 inches, suitable for #10 hole sizes. Its precise construction, with an inside diameter of .199 inches, guarantees a perfect fit for your fasteners. Rest assured, this washer complies with industry standards for quality and safety, making it an essential tool for your assembly needs.