Car gasket is a component used to connect structures, usually a flat metal ring, placed between the connected part and the nut. It can effectively protect the surface of the connected structure from scratches from the nut, while dispersing the burden of the nut on the connected structure. There are various types of washers, each with different sizes, thicknesses, and materials, so their functions also vary.

Automotive fasteners are tools or accessories used to connect automotive components, and they are crucial in the assembly and maintenance process of automobiles. Their main function is to ensure the safe and reliable connection of automotive components, avoid loosening or separation during driving, and thus ensure the safety of driving. According to their different uses and shapes, automotive fasteners can be classified into various types, such as bolts, nuts, screws, washers, and pins.