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How do you remove broken bolts?

Updated: 10/20/2022
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Wiki User

8y ago

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If you can get at them with a drill buy an easyout which is like a drill bit but the threads are backwards. The size of the bolts will determine the size of the easyout and the size of the drill bit to use. Drill a hole down through the middle of the bolt and then insert the easyout and turn counter clockwise. The bolt should come loose. Soak the bolt first with liquid wrench or some other penetrating fluid to loosen up, the longer the better. If you have room to put a pair of vise grips on the bolt then this method would be easier. The secret is to soak with the liquid wrench for as long as possible.

I have used the PB Penetrating Catalyst to unfasten one of the rusted and broken bolt on my old brake caliper. It took few spray and overnight to break the tought broken bolt but it's better than drilling the threads in my opinion. This product is amazing and I have told my friends to try this as well.

www.pbblaster.com

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8y ago
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8y ago

Search for "stud extractor". Looks like a drill bit but the cutters are left hand thread, designed to be used with the drill in reverse. The lid of the box or the extractor should be marked to indicate

a) the size they are designed to extract

b) the drill bit size you use to drill a hole for the extractor.

Before you start apply some penetrating oil.

  1. Select the correct extractor and drill bit for the bolt size.
  2. Use a punch to make a dimple in the centre of the snapped shaft.
  3. Drill a pilot hole a few mm deep with the drill bit.
  4. Put the drill in reverse with the extractor in it.
  5. Put the extractor in the hole and go for it.
  6. If that doesn't work buy "freeze and release" spray and use as instructed.
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