Enhance the security of your fastening applications with this External Tooth Lock Washer. Made of durable steel with a protective zinc coating, it ensures reliable performance and corrosion resistance. Measuring .501 inches in outside diameter and .025 inches in thickness, it is designed to fit 1/4-inch hole sizes. Its ASME B18.21.1 specification guarantees quality and precision. The washer's unique external tooth design provides added grip, preventing loosening over time. With an inside diameter of .262 inches, it is perfect for a wide range of industrial and mechanical applications. Its non-RoHS compliant status does not compromise its effectiveness in securing your assemblies. Trust in this lock washer to maintain the integrity of your connections.