1. Manual Tightening

• Use the Right Tools: Select the appropriate wrench, screwdriver, or socket tool based on the type of screw (e.g., hex head, socket head, cross-slot).
• Apply Even Force: When tightening screws, apply force evenly to avoid over-tightening, which can damage the screw or cause deformation.
• Identify the Cause of Loosening: If screws frequently loosen, it may be due to insufficient torque or a mismatch between the screw and the threaded hole. Further inspection is required.

2. Use Anti-loosening Measures

• Anti-loosening Washers: Use washers such as spring washers, wave washers, or nylon-insert lock washers, which provide additional anti-loosening effects after the screw is tightened.
• Anti-loosening Nuts: Use nuts such as nylon-insert lock nuts or self-locking nuts, which prevent screw loosening through elastic nylon inserts or special thread designs.
• Thread Locking Compound: Products like Loctite thread locking compound can create a bonding layer between threads to prevent screw loosening.

3. Inspect Thread and Screw Condition

• Check for Thread Wear: Severe thread wear can cause screws to loosen. In such cases, replace the screw or repair the threaded hole.
• Check Screw Length: If the screw is too long or too short, it may not provide sufficient clamping force. Select screws of the appropriate length.
• Check Screw Material: If the screw material is not suitable for the environment (e.g., in corrosive conditions), it may lead to loosening or damage. Consider replacing with screws made of corrosion-resistant materials.

4. Adjust Equipment or Structure

• Add Vibration Damping Measures: Install vibration dampers or rubber pads at the base of the equipment or connection points to reduce the impact of vibration on screws.
• Redesign the Structure: If loosening is due to poor structural design, consider redesigning or reinforcing the relevant components.

5. Regular Inspection and Maintenance

• Regular Tightening: For critical screws, regular inspection and tightening are recommended, especially on equipment subject to vibration.
• Record Torque Values: When tightening screws, record the required torque values for reference during subsequent inspections and maintenance.

6. Special Situation Handling

• Thread Repair Tools: Use tools like thread repairers or taps to fix damaged threads.
• Replace Screws: If repair is not effective, consider replacing the screw.
• Thread Inserts: For severely damaged threaded holes, install thread inserts (e.g., Heli-Coil), which are metal wire-based thread repair devices that restore the integrity of the threaded hole.

7. Safety Precautions

• Avoid Over-tightening: Over-tightening can cause screws to break or damage the threaded hole.
• Use Appropriate Torque: Tighten screws using the appropriate torque values based on their specifications and material.
• Tool Safety: Ensure that tools are compatible with the screws and use them correctly to avoid slippage or damage.

Summary