Enhance the security of your fastening applications with our External Tooth Lock Washer. Crafted from durable Phosphor Bronze with a protective Nickel finish coating, this washer ensures reliable performance and longevity. Designed to ASME B18.21.1 specifications, it features an outside diameter of .501 inches and a thickness of .025 inches, making it ideal for various industrial and commercial settings. The unique external tooth design provides enhanced grip and prevents loosening, offering peace of mind in high-stress environments. With an inside diameter of .262 inches and a hole size of 1/4 inch, it is compatible with standard fasteners. Rest assured, this high-quality washer is built to last and is not RoHS compliant. Elevate the integrity of your assemblies with this essential hardware component.