Enhance the security of your fastening applications with our External Tooth Lock Washer. Crafted from durable Phosphor Bronze, this washer offers reliable performance in various environments. Designed to meet ASME B18.21.1 specifications, it ensures a precise fit for 1/4-inch hole sizes. With an outside diameter of .501 inches and a thickness of .025 inches, it provides optimal support and stability. The external tooth design guarantees a tight grip, preventing loosening and vibration. Engineered for efficiency and longevity, this washer is a must-have for your industrial or DIY projects. Rest assured, it is RoHS compliant, making it a safe and environmentally friendly choice. Upgrade your fastening system with this high-quality External Tooth Lock Washer.