How to Unscrew Rusty Screws
Nothing can turn a small job into a big one faster than a stuck screw. Rust is one of the main causes for stuck screws, and it creates another problem. If the screw is corroded by rust, it's easy to break off the head when you are trying to remove it, leaving part of the screw in place with no way to get it out. Therefore, you should try loosening the threads before you use more persuasive extraction techniques. Does this Spark an idea?
Things You'll Need
- Rotary tool and grinding attachment
- Screwdriver
- Thread lubricant
- Propane torch
- Drill and bit
- Screw extractor
- Hammer
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Instructions
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Grind the slot on the head of the screw with a rotary tool and a grinding attachment if the screwdriver slips when you try to remove it. Then spray thread lubricant on the screw head and let it seep for five minutes before using a new screwdriver, or at least one with a head that isn't worn, to try again.
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Hold a propane torch to the head of the screw for two or three seconds, and then remove it. If the screw is held by a locking agent, the abrupt temperature change will soften it and release the screw.
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Drill a small hole about 1/8 inch into the head of the screw, then reverse the drill and let the force of the drill torque the screw. If the bit slips, drill a deeper hole and try again.
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Remove the drill bit from the drill and insert a screw extractor. This is a cone-shaped, reverse-thread bit that will grip metal better than a drill bit. Insert the head of the extractor into the hole and push down while you operate the drill in reverse mode.
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Use the extractor with impact driver if the screw is still stuck. The impact action of the driver may jar the screw loose.
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Grind the sides of the screw head flat with the rotary tool, and then use a hammer to pound a screwdriver into the side, torquing the screw by force.
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Tips & Warnings
If at any point the head of the screw breaks off, you may be able to separate the pieces it was holding together and remove the screw shaft with pliers, or, if nothing else works, cut it off.
Don't use an oxy-acetylene or MAP-gas torch to heat the screw. While any torch can generate enough heat to cause damage or start a fire, these are much more likely to do so.
References
- Photo Credit old door hinge image by green308 from Fotolia.com
