Spring washers, which have axial flexibility and are usedto prevent fastening or loosening due to vibrations. Locking washers, which prevent fastening or loosening bypreventing unscrewing rotation of the fastening device;locking washers are usually also spring washers.
Spring washers should be used on the nut side of thefastener. If an additional washer is required to spreadthe load (as in our image above) it should be usedbetween the spring washer and the mounting surface.
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