Application Scenarios for Threaded Fasteners

Based on structure and function, threaded fasteners are primarily categorized as follows:

Bolts and Nuts: The classic combination. Bolts are typically paired with nuts and pass through clearance holes in the components being joined; they are suitable for applications requiring high clamping force and strong, detachable connections, such as steel bridges and heavy machinery.

Screws: Usually driven directly into pre-threaded or self-tapped holes in the workpiece, eliminating the need for a nut. They feature various head drive types (Phillips, slotted, hex socket, Torx, etc.) and are widely used in assembling electronics housings, home appliances, and lightweight frameworks.

Studs: Rod-like fasteners threaded at both ends. One end (the base end) is typically fixed to a substrate via interference fit or adhesive, while the other (the free end) is used for mounting and removing components. Common applications include engine cylinder heads, valves, and pipeline flange connections requiring frequent maintenance.

Self-tapping Screws: Featuring a sharp tip and threads designed for cutting or forming, these screws can create their own mating threads in softer materials like plastic, thin sheet metal, or wood. Recommended installation speed is 800–1,500 rpm; excessive speed can cause material overheating or thread stripping.

Specialty Fasteners: Designed for specific applications, such as self-clinching nuts/screws and rivet nuts for sheet metal (allowing single-sided installation without needing access to the back), weld studs, and insert nuts for composite materials or honeycomb structures.