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tech
jeepfan.com
Guide to a Jeeper's Garage
Hand Tools
Bolt /
Screw Extractor
NorthernTool.com
extractor set
We are all bound
to experience the "old busted bolt in the
threaded frame hole" or similar scenario
while working on our Jeeps. Perhaps
following the advice in the
Removing
Seized Nuts and Bolts section this situation would
happen less often but a broken bolt is
inevitable and rarely does it happen when
it's a nut and bolt.
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 An
extractor is a tool that can save
you in the situation of a broken
bolt. Extractors are made of
high strength steel and usually have
a reversed thread design (shown
above) that causes the extractor to
dig further into the broken bolt as
more force is applied. Some
extractors have sharp teeth (shown
on the left) that will dig into the
bolt after it has been hammered into
the stuck bolt.
Use
- If
necessary (or possible) file or
grind the exposed top of the bolt to
flatten the top. Using a
center punch attempt to locate the
center of the bolt and punch a start
hole for drilling.
- Drill a hole as straight as
possible using the appropriate
sized drill for the extractor (a
pilot hole may be needed first).
- Apply some thread loosening
spray. Again, see the
Removing
Seized Nuts and Bolts for recommendations on spray
types.
- Insert the extractor and follow
the procedure for the particular
extractor. Be careful not
to break the extractor in the
drilled hole. A broken
extractor is near impossible to
drill out because of their
hardness (See Below).
- Apply even force on the
extractor and attempt to remove
the broken bolt.
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If it seems that
removal of the bolt is impossible without breaking the
extractor and all other options have been attempted drilling
out the hole and using a threaded insert to repair the
threads may be needed. See Threaded Inserts.
Removing a
Broken Extractor
A broken
extractor is difficult to remove. Using a small punch
it is possible to break up the extractor in the hole and
remove the pieces. Drilling on the extractor will just
dull a drill bit.
Recommendation
A set of common
sized extractors of either design.
Popular
Extractor Tool
Manufacturers and Resellers
Craftsman
SnapOn
Matco
Husky
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