Enhance the security of your fastening applications with this premium quality External Tooth Lock Washer. Crafted from durable stainless steel, it provides reliable protection against loosening, ensuring long-lasting stability. Designed to meet ASME B18.21.1 specifications, it features an outside diameter of .278 inches and a thickness of .017 inches, making it suitable for a range of industrial uses. The precise inside diameter of .133 inches and hole size of #5 guarantee a perfect fit with corresponding bolts and screws. Rest assured of its compliance with RoHS regulations, making it a sustainable choice for your projects. Upgrade your fastening solutions with this essential component for optimal performance and peace of mind.