What are the most commonly used fasteners?

• A. Threaded bolts
• B. Pins
• C. Screws
• D. Staples

Answer: (A)

Threaded bolts are the most commonly used fasteners because they deliver strong, adjustable clamping across a wide range of materials and applications. They pass through holes in two parts and are secured with nuts (often with washers) to spread the load and prevent loosening. The clamping force can be set precisely by tightening to a specified torque, and different bolt grades match strength to the job. They’re removable and reusable, which makes maintenance and disassembly straightforward. In many industrial settings, including boilerwork and structural assemblies, this versatility and reliability keep bolts as the go-to choice for holding components firmly together. Pins, by contrast, mainly locate parts or provide simple shear connections rather than strong, clamped joints; screws rely on engaging tapped holes and may not handle the same high-load, disassembly-friendly requirements; staples are light-duty and not suitable for structural or heavy-duty connections.