problem with broken off bolt

[Soundguy]

The vast majority of the time .. same here... Only a few rare cases did I get some relief.. they were brass bolts into a steel casting holding down an inspection cover to a chain drive box on a piece of heavy equipment. I'll bet half the bolts backed out when the bit grabbed...

No super luck with the easy outs.. though have had them accidentally function a time or too. Mostly ZI have just had to drill them out going up a 64th or 32nd at a time hoping to miss the parent metal.. then getting a dental pick or oring probe to pick the threads out and pray i drilled straight

Soundguy

 

[TheKid]

Sears makes a tool called a "bolt out" that might do the trick. Kind of like an easy out only it works on the outside of the head of the bolt. Look here.

 

[CurlyDave]

I don't think it will help you at this point but for future reference, I have had a lot more success with "easy out" type tools that have a square cross section rather than the expanding spiral which is more common.