The washer refers to the part that is cushioned between the connected piece and the nut. Generally, a flat metal ring is used to protect the surface of the connected part from being scratched by the nut and disperse the pressure of the nut on the connected part.
The function of the flat washer is to allow the pressure of the nut to be evenly distributed on the pressure member, and at the same time, it also protects the surface of the bolt thread and the connecting body. Generally thin metal shells are fixed with metal flat gaskets.
Spring washers are used for bolt connection to prevent bolts and nuts from loosening due to shock. Especially the bolts that are not easy to see or operate should use spring washers.
The rubber gasket is made of two materials, one is a gasket made of non-oil-resistant raw materials for sealing the air, such as the gasket used on the air filter housing; the other is made of oil-resistant raw materials. For example, the gaskets on both ends of the diesel oil filter. It should be noted that oil-resistant rubber pads can replace non-oil-resistant rubber pads, and non-oil-resistant rubber pads cannot be used instead of oil-resistant rubber pads. In the long-term use of the rubber pad, if it is found to be hardened and lose its elasticity, it should be replaced in time to avoid wear of the parts.