Flat washers can relieve pressure, increase friction, seal, shock absorption, and secure. Spring washers can increase the friction between nuts and bolts, prevent bolt loosening, and improve the stability of the connection.

Fixed seats, seat belts, and other interior components: Automotive fasteners are also used to secure seats, seat belts, and other interior components. These components are crucial for providing a comfortable and safe riding environment. In the process of automobile manufacturing, fasteners are widely used to connect various components of the vehicle body, such as doors, carriages, hood, etc. They ensure that these components are firmly connected together, thereby ensuring the stability and smooth driving of the entire vehicle.