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How do you drill out a broken bolt?

Updated: 12/12/2022
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14y ago

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There are several options. -Bolt extraction kits, you can probably get one at your local autoparts store. Drill a hole in the bold and insert the extractor, turning counter-clockwise. You may need to tap it in with a hammer first. It's best to use a reverse-thread drill bit to drill the hole. They should be in the same section as the extraction kits. The advantage of the reverse-thread drill bit is that it turns counter-clockwise, the same direction you need to turn the bolt to get it out, thus the drill alone may pull the bolt out if the drill bit catches and the bolt is loose. Use caution when using the extraction kits though. They are brittle and if you overtorque it you can end up breaking the bit in the hole. Then you have a much bigger problem. -If enough of the bolt is above the surface, you can use a dremmel to cut a notch, then use a flat-head screw driver to turn the bolt out. -For really stubborn bolts, you can drill the bolt out completely and re-thread the hole. This should only be attempted if you have a drill press. If you are using a hand drill and eyeballing it you will probably end up messing up the hole and the threads. -Depending on the age and condition of the metal that the hole is in and if lock-tight has been applied to the bolt, heat may be used to loosen the bolt. Heat the area around the hole with a propane torch. -If all else fails, take it to your local machine shop and have them drill it out for you.

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