Ensure maximum security for your fastening applications with this Internal Tooth Lockwasher. Crafted from high-quality 316 Stainless Steel, it offers exceptional durability and corrosion resistance. With an outside diameter of .402 inches and a thickness of .021 inches, it is designed to fit #10 hole sizes perfectly. The internal teeth provide a secure grip, preventing loosening due to vibrations or other forces. RoHS compliant, this lockwasher is not only reliable but also environmentally friendly. Upgrade your fastening solutions with this essential component.