***About Flat Washers***
The gasket acts on reducing friction, preventing leakage, isolating, preventing loosening or dispersing pressure, and has types such as flat washers, spring washers, wave washers, and multi-tooth washers.
The flat washer is one of the washers mainly used to reduce the pressure. When some parts are tightened, the axial force is large, and the gasket is easily pressed into a dish shape. In this case, the material can be changed and the hardness can be improved.