The Internal Shakeproof Washer is a reliable anti-vibration solution, designed with serrated edges that grip the fastening surface to prevent loosening from vibration or movement. Positioned under the head of a screw or nut, it provides a secure hold, maintaining tension in demanding applications. This washer enhances stability and longevity, making it a key component in ensuring fastener reliability. Available in various sizes and materials to meet diverse application needs.