Enhance the security of your fastening applications with our External Tooth Lock Washer. This durable washer, made from 410 Stainless Steel, features a precise outside diameter of .278 inches and a thickness of .017 inches. Compliant with ASME B18.21.1 specifications, it ensures reliable performance in various industrial settings. The unique external tooth design provides a strong grip, preventing loosening due to vibrations or movement. With an inside diameter of .133 inches and a hole size of #5, it is perfect for use with corresponding screws or bolts. Rest assured, this washer is RoHS compliant, meeting strict environmental standards. Elevate the stability and longevity of your assemblies with this essential locking component.