A Tooth Washer, also known as a Locking Washer, is a type of washer with a series of teeth or pointed edges around the outer or inner edge. These teeth are designed to bite into both the fastener and the surface to which it is being secured, creating friction that helps prevent the fastener from loosening due to vibration or torque. ... Tooth washers are particularly effective in high-vibration environments, such as automotive, machinery, and construction applications. They are made from materials like steel, stainless steel, or brass for strength and corrosion resistance. The washer ensures a secure, long-lasting connection by preventing the fastener from turning or backing out over time.