1. Assess the extent of stripping and clean the screw hole.
If the stripping is minor, use compressed air or a fine brush to remove metal debris, oil, and residue from the hole.
If the screw is broken or cannot be removed, use a screw extractor or drill to remove it.
2. Repair or strengthen the screw hole.
Choose one of the following methods depending on the substrate and usage requirements:
Retapping: Use a tap slightly larger than the original size (e.g., use M4.5 or M5 instead of M4) to re-tap the screw hole, avoiding the original stripped area.
Installing a wire thread insert: After enlarging the hole, screw in a high-strength wire thread insert to form a durable internal thread. Suitable for critical load-bearing areas.
Filling repair method: Fill the stripped hole with metal filler, allow it to cure, and then re-drill and tap. Suitable for emergency treatment when no special tools are available.
3. Choose the appropriate replacement screw.
Use a larger size self-tapping screw to match the newly repaired screw hole;
Or use self-extruding/self-cutting self-tapping screws to improve engagement in hard materials;
In plastic parts, consider using screws with a high/low thread design to reduce screwing stress and minimize the risk of stripping again.
4. Follow proper installation procedures.
Keep the screw perpendicular to the mounting surface to avoid misalignment;
Control the screwing speed, initially using a low speed for positioning, and then advancing at a constant speed after confirming engagement;
When using power tools, set an appropriate torque to prevent overtightening that could lead to secondary stripping.
✅ Key Tip: After repair, it is recommended to use thread-locking compound to enhance anti-loosening performance, especially suitable for connections in vibration environments.
