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.

Tightening the tires and brake system: Fasteners are also used to tighten the tires and brake system, which is a key factor in driving safety for automobiles. They ensure that the tires and brake system are securely installed on the vehicle to prevent accidents during driving.