how to remove a screw that is stripped

Yum Al Zember

4 min read

·

27-11-2024

3

0

Share

Dealing with a stripped screw is frustrating, but with the right techniques and tools, you can usually remove it without causing further damage. This article explores various methods, drawing upon insights from scientific literature and practical experience to provide a comprehensive guide. We'll delve into the mechanics of screw removal, analyze why screws strip in the first place, and offer solutions ranging from simple fixes to more advanced techniques.

Understanding Why Screws Strip

Before tackling removal, it's crucial to understand why screws strip. This knowledge informs our choice of removal method. While the exact reasons vary, some key factors include:

• Over-tightening: This is the most common culprit. Applying excessive force during installation can deform the screw head, weakening its grip and making it prone to stripping.
• Incorrect Screwdriver: Using a screwdriver with the wrong size or type (Phillips vs. flathead) can cause slippage and damage the screw head. The mismatched tip can cam out, damaging the screw's head.
• Material Degradation: Over time, materials can weaken due to corrosion or age. This makes screws more susceptible to stripping, especially in outdoor applications.
• Low-quality Screws: Cheaper screws are often made from softer materials, making them more prone to stripping.
• Vibrations: Constant vibrations, common in machinery, can loosen screws and eventually lead to stripping.

Methods for Removing Stripped Screws

The best approach depends on the severity of the stripping and the type of screw head. We will explore a range of methods, starting with the simplest:

1. Increased Grip Methods:

• Rubber Band/Grip Enhancing Material: Placing a rubber band over the stripped screw head can increase friction, providing a better grip for your screwdriver. Similarly, applying a bit of putty, such as modeling clay or even chewing gum, can offer improved traction. This is effective for minor stripping.

• Using a Larger Bit: If the screw head is only slightly damaged, try using a slightly larger screwdriver bit. This might provide enough extra gripping surface to remove the screw. However, be extremely cautious, as using a too-large bit could worsen the damage.

• Using a Vice Grip: For screws with relatively large heads, a vice grip or similar gripping tool can provide sufficient clamping force to turn the screw. This is a powerful method but requires careful application to avoid damaging the surrounding material.

2. Specialized Tools:

• Screw Extractor: Screw extractors are specifically designed for removing stripped screws. They work by drilling a small hole into the stripped screw head and then using a reverse-threaded bit to extract it. There are various types, including left-hand drill bits and specialized extractors with various tips that latch onto what is left of the screw head. (Note: This often requires careful and precise drilling to avoid damaging the surrounding material).

• Impact Driver: An impact driver uses impact force to loosen stubborn screws, including stripped ones. The impact force can break loose a stubborn screw which wouldn't budge with standard screwdriver pressure alone. Always ensure the bit fits properly to prevent further damage. This is a very effective method for many applications.

3. Advanced Techniques:

• Drilling Out the Screw: As a last resort, if all else fails, you may need to drill out the screw. This requires precision and the correct drill bit size. You will need to drill a hole slightly smaller than the screw's shaft diameter. If possible, use a center punch to start the hole accurately, minimizing the risk of slippage or damaging the surrounding material.

• Heat Application: Applying heat to the screw can sometimes help to expand the metal, making it easier to remove. This is particularly useful for screws that are seized due to corrosion. However, this method requires caution, as excessive heat can damage the surrounding material.

4. Chemical Methods (for specific situations):

• Penetrating Oil: Applying a penetrating oil, like WD-40 or PB Blaster, can help to loosen the screw by breaking down rust and corrosion. Allow sufficient time for the oil to penetrate before attempting to remove the screw. This is often used in combination with other methods.

Practical Examples & Case Studies

Let's illustrate these methods with specific examples:

Example 1: Stripped Phillips Head Screw on Eyeglass Frame: A small, slightly stripped Phillips head screw on an eyeglass frame is best tackled with a rubber band to increase grip and a very small, high-quality Phillips head screwdriver. Avoid excessive force!

Example 2: Stripped Bolt on a Car Engine: A stripped bolt on a car engine would likely require a more robust solution, such as an impact driver or even a screw extractor, potentially in conjunction with penetrating oil to loosen corrosion. This scenario necessitates a thorough understanding of the engine's components and potentially requires the help of a mechanic.

Example 3: Stripped Screw in a Wooden Cabinet: For a stripped screw in wood, drilling it out is a possibility, but it will leave a hole. Using a screw extractor is preferable, if possible, and often less damaging than fully drilling out the screw, provided enough of the screw head remains.

Safety Precautions

Always prioritize safety when removing stripped screws:

• Wear safety glasses: Debris can fly during the removal process.
• Use the right tools: Using the wrong tools can lead to more damage and even injury.
• Take your time: Rushing the process can lead to mistakes and further damage.
• If unsure, seek professional help: Some situations, particularly involving complex machinery or delicate components, require the expertise of a professional.

Disclaimer: The information provided in this article is for general guidance only. The best approach will depend on the specific situation. Always prioritize safety and consider seeking professional assistance if you are unsure about any step of the process.

Conclusion

Removing stripped screws can be challenging, but with the right approach and tools, you can successfully remove them. By understanding the causes of stripping, choosing the appropriate technique, and taking necessary safety precautions, you can avoid further damage and successfully complete your repair. Remember to always assess the situation and choose the method best suited to your needs and skill level. If in doubt, seek professional help!