Spring washers prevent loose threads. However, under the action of vibration, alternating or impact load, sometimes the thread will still be loose. In order to minimize the relative rotation of the bolt and the nut, the cymbal can be evenly placed with 2 to 4 shallow grooves of 0.5 to 1 mm deep on the circumferential surface of the nut in contact with the spring washer (as shown in the figure). When tightening the screw
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