What are the functions of spring washers and ordinary gaskets?

In terms of design ideas, spring washers (also called spring washers) have a pre-tension that, after being compressed, rebounds back. In actual use, due to the characteristics of the thread, the nut is easily rotated in the direction of the spiral after tightening, resulting in loosening of the nut. In order to solve this problem in the early days, spring washers appeared. Due to the pre-tension of the spring washer, after the nut is pressed against the spring washer, under the action of the pre-tension, the side of the triangular screw of the nut and the screw of the bolt triangle are tightly attached together, in the friction Under the action, the nut will no longer appear loose. Ordinary gaskets (also called round or flat gaskets or ordinary gaskets) are a support under the pre-tension of the spring washer, which increases the pressing area of the preload of the spring washer. In general, spring washers and conventional washers are used together, and it is unreasonable to use ordinary washers alone. Of course, the design and actual needs of individual uses are not excluded. For example, when the plastic outer casing of an electric appliance is screwed with a self-tapping screw, the following ordinary ordinary gasket is only for increasing the force receiving area.