Gaskets generally play a sealing role: Gaskets made of relatively soft materials are added between two flat surfaces that need to be sealed. Zd makes it easy to meet the sealing requirements. The gaskets between the engine block and the cylinder head all play a sealing role.
However, there are also some connectors used to increase the area of tightening force, that is, to spread the pressure of the nut, to protect the flat washer of the connection surface, or to lock the screw nut, anti-loosening spring washer, butterfly Washers are called "flat washers" and "spring washers".
