In the manufacturing of pressure vessels, pipeline systems, and heavy equipment, bolts and nuts are critical connecting components. Their selection directly impacts structural safety and reliability. Below is a summary of 15 common types of bolts and nuts, including their features and typical application scenarios, for industry reference.

I. Bolts

1. Hex Head Bolt
• Features: Hexagonal head for wrench tightening, easy installation, and high load-bearing capacity.
• Applications: General machinery, building structures, and basic connection scenarios.

2. Allen Bolt
• Features: Hexagonal socket head requiring an Allen key for operation, compact structure, and high fastening force.
• Applications: Precision equipment, mold assembly, and hidden installation scenarios.

3. Countersunk Head Bolt
• Features: 90° conical head that can be fully embedded into the workpiece surface for a flat connection.
• Applications: Furniture, construction, and other scenarios requiring flush surfaces.

4. Union Bolt
• Features: Enables quick connection and disassembly via a threaded union, facilitating easy maintenance.
• Applications: Pipeline systems and fluid engineering requiring frequent disassembly.

5. Flange Bolt
• Features: Integrated flange enlarges the contact area, offering excellent anti-loosening and vibration resistance.
• Applications: Engines, heavy equipment, and high-vibration, high-load environments.

6. Square Head Bolt
• Features: Square head disperses shear force, providing outstanding shear resistance.
• Applications: Heavy machinery and structural connections under high shear loads.

7. Round Head Bolt
• Features: Round head protrudes after installation, offering a smooth appearance.
• Applications: Furniture assembly, temporary fixes, and scenarios with low aesthetic requirements.

II. Nuts

1. Lock Nut
• Features: Self-locking via friction, providing reliable anti-loosening performance.
• Applications: Engines, transmission systems, and other vibration-prone equipment.

2. Round Nut
• Features: Often used with lock washers; interlocks via grooves for axial fixation.
• Applications: Bearing fixation and high-speed rotating equipment.

3. Self-locking Nut
• Features: Built-in nylon ring or deformed threads create friction for anti-loosening.
• Applications: Aerospace, automotive manufacturing, and other high-vibration fields.

4. Lock Nut / Self-locking Nut
• Features: Mechanical design (e.g., riveting, deformation) prevents loosening.
• Applications: Vehicle chassis, mechanical equipment, and long-term vibration environments.

5. Hex Nut
• Features: Hexagonal shape compatible with standard wrenches, highly versatile.
• Applications: Basic fastening in mechanical connections and building structures.

6. Claw Nut
• Features: Four-claw structure allows pre-embedding into plates without additional tools.
• Applications: Furniture, composite materials, and embedded connections in non-metallic materials.

7. Ring Nut
• Features: Ring design ensures even clamping force and high security.
• Applications: Pressure vessel sealing, bearing fixation in heavy machinery.

8. Wing Nut
• Features: Wing-shaped design enables hand-tightening without tools.
• Applications: Laboratory equipment, pipeline connections, and scenarios requiring quick adjustments.

Conclusion

Selecting the right bolts and nuts is crucial for ensuring equipment safety and reliability. As a stainless-steel pressure vessel manufacturer, we prioritize the compatibility and reliability of connecting components, providing customized solutions tailored to operational needs.