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The spring washer can prevent looseness and increase the preload, while the flat washer does not. It can be used to increase the fastening contact area, prevent the friction between the bolt and the workpiece, protect the surface of the connector and prevent the surface of the workpiece from being scratched when the bolt and nut are tightened.

However, some important connections, such as places that mainly rely on compression to generate friction to transmit power, can not use spring pads. If they are used to reduce the connection rigidity, it is easy to have accidents. Spring washers may not be used. When the strength of the connected part is low, the flat pad or flange bolt shall be used to increase the contact area. When there is vibration, pulse and large fluctuation of medium temperature, the spring pad must be used.