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How to Drill Out a Broken Bolt?

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Reginald P. Smithers III Reginald P. Smithers III is offline

Reginald P. Smithers III is offline

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First recorded activity by BoatBanter: Aug 2006

Posts: 761

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How to Drill Out a Broken Bolt?

wrote:
Call around to hardware stores and ask if they sell spiral screw
extractors.
Before you jump in the car, measure the diameter of the bolt shafts you
need
to remove. And, if you know the socket size that fits the heads, write
that
down too.
I tried that already. Either it didn't work or I went too easy on the
hammer. Anyway, it could not grab the bolt and could not spin the bolt
out. I attempted to drill one of the broken bolt away. But this
simply messed up the thread in one of the hole.
Hammer????????

Do you mean I am not supposed to use a hammer to work with the screw
extractor? I am under the impression that I am supposed to drill a
hole in the middle of the borken bolt, and hammer the screw extractor
down into the hole, and then use some kind of handle bar to lock on the
screw extractor and turn counter clockwise, and hopefully the screw
will back out. This was exactly what the owner of the hardware store
told me to do.

May be we are talking about two different types of screw extractors?
May be you are referring to the type that is like a drill bit, and we
are supposed to use it with a power drill (running in reverse) to dill
and back off the bolt? I could not use that type because the bolt was
sunken inside a small hole that the special drill bit was too large to
fit inside.

Jay Chan

The one I have seen had reversed threads so as you screwed it in, it
unscrewed the bolt

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