M20 Ribbed Lock Washer Black Steel

Ribbed lock washers are a type of washer with radial ribs on both sides that bite into the surfaces of both the bolt head and the workpiece to prevent loosening. This design creates increased friction and a secure grip, making them highly effective at resisting loosening from vibration and dynamic loads. They are often used where adhesives are not an option and are generally considered more effective than standard spring washers.