Enhance the security of your fastening applications with our Internal Tooth Lockwasher. Crafted from durable steel with a sleek black oxide finish, this washer ensures a reliable grip and prevents loosening over time. With an outside diameter of .402 inches and a thickness of .021 inches, it is suitable for #10 hole sizes. Its precise design, featuring an inside diameter of .199 inches, guarantees a perfect fit. Rest assured, this essential component is RoHS compliant, meeting strict environmental standards. Upgrade your assembly process with the added assurance of our high-quality Internal Tooth Lockwasher.