The main purpose of the spring washer is to increase the friction between the nut and the bolt to prevent the bolt connection from loosening due to vibration in the equipment ‌. Spring washers, by their elastic properties, provide a continuous elastic force when the nut is tightened, increasing the friction between the nut and the bolt, thus preventing the nut from loosening ‌

. In addition, the anti-loosening principle of the spring washer is that by inserting the sharp corner of its opening into the surface of the bolt and the connected part, a resistance moment is produced to prevent the nut from loosening ‌