Fasteners are indispensable basic components in mechanical manufacturing and daily life. Their main function is to reliably connect two or more parts together, forming an integrated structure.

Specifically, the main uses of fasteners include:

• Fixing and Connecting: The most common application – for example, using bolts to secure engine components to a frame, or using screws to fasten electronic device enclosures.

• Locking and Sealing: Used in combination with washers, nuts, etc., to prevent loosening caused by vibration or external forces. Some fasteners also provide sealing functions to prevent gas or liquid leakage.

• Easy Assembly, Disassembly, and Maintenance: Compared to welding or riveting, fastener connections allow repeated assembly and disassembly, facilitating equipment maintenance and component replacement.

• Load Transmission and Positioning: High-strength bolts can withstand shear or tensile forces, while also precisely positioning components within a mechanism.

Summary: Although small in size, fasteners play a critical role – from eyeglasses and smartphones to automobiles, aircraft, and bridges, fasteners can be found everywhere.