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An example of a washer is a device used in assemblies to distribute the load evenly and prevent fasteners from loosening due to vibration or movement. It has an internal diameter larger than the nut and a smaller external diameter that fits between the nut and the bolt head, providing a reliable connection. Washes come in various materials, such as plastic, brass, steel, and nylon, and can also have different shapes like flat, dome-shaped, or spring-type.