Keep your fasteners securely in place with this External Tooth Lock Washer. Designed to prevent loosening and slipping, this washer is a crucial component in any assembly project. Made from durable stainless steel, it offers reliable protection against corrosion and wear. With an outside diameter of .402 inches and a thickness of .021 inches, it provides a snug fit for #10 sized holes. Its ASME B18.21.1 specification ensures high quality and performance standards. Rest assured, this washer is not only effective but also environmentally friendly, meeting RoHS compliance. Upgrade your fastening system with this essential component.