Ensure secure fastening with this External Tooth Lock Washer. Made from durable 400 Series Stainless Steel, this washer is designed to provide reliable locking action in mechanical assemblies. With an outside diameter of .522 inches and a thickness of .522 inches, it offers a perfect fit for a 1/2 inch hole size. Meeting ASME B18.21.1 specifications, it guarantees quality and performance. The external tooth design enhances grip and prevents loosening, making it ideal for various industrial applications. Rest assured, this washer is also compliant with RoHS regulations, underscoring its commitment to environmental responsibility. Upgrade your fastening solutions with this essential component.