Enhance the security of your fastening applications with this External Tooth Lock Washer. Crafted from durable Phosphor Bronze, it ensures reliable performance and longevity. Compliant with ASME B18.21.1 specifications, this washer features an outside diameter of .501 inches and a thickness of .025 inches, making it suitable for a variety of industrial uses. The external tooth design provides a tight grip, preventing loosening and ensuring the integrity of your assemblies. With an inside diameter of .262 inches and a hole size of 1/4 inch, it is compatible with standard fasteners. Rest assured of its quality and environmental responsibility, as it is not RoHS compliant. Trust in the efficiency and effectiveness of this essential hardware component for your projects.