Name that tool

[jaky cakes]

I normally drill progressively larger holes with progressively larger drills until I'm able to collapse the remaining thread of the now hollow stud, in on itself.
Or if you do buy stud extractors / easi-outs , buy the most expensive - as these will be made of a very hard tool steel.

[Vagrant No2]

I normally drill out sheared bolts as 'easy outs' , as I know them to be called , always break off giving you twice the greif . If you drill just off centre and then progress up in drill size you will get to a point where you can collapse the rest of the bolt in without damaging the threads . If you do catch the threads it will only be in one place because you have drilled off centre .

[Morr]

...... as 'easy outs' , as I know them to be called , always break off giving you twice the greif . .......

Look out for another design, I have a set of Rigid brand extractors. You drill the broken screw/stud as normal, then hammer in a splined shaft, slide a hex fitting over the protruding splines and remove with a normal spanner/socket.
Rarely let me down (ocasionally slip in the drilled hole) but never shear off leaving you with more trouble.

[NiftyNev]

I'v heard a left handed drill bit works very well. Drill with lots of pressure and very often the broken bolt/stud will unscrew while drilling. One problem though. Where to buy left handed drills ???

Nev

[TonyN]

Look out for another design, I have a set of Rigid brand extractors. You drill the broken screw/stud as normal, then hammer in a splined shaft, slide a hex fitting over the protruding splines and remove with a normal spanner/socket.
Rarely let me down (ocasionally slip in the drilled hole) but never shear off leaving you with more trouble.

I've got these, they work great, and feel a little more rubust than the screw in ones, especially in small sizes. But both work OK if your careful.

[pops]

easy outs when i was a lad too matt
but stud extactors ect now

[Chillitt]

lots of helpful advice, but matts just trying to finish the crossword in a 1985 motorcycle news....

[stormforce]

lots of helpful advice, but matts just trying to finish the crossword in a 1985 motorcycle news....

was that the kids quick crossword Matt was doing