It isn't hardened, you are either using a dull twist drill or you are spinning the drill too fast.I have a broken exhaust bolt on my rhino and all the bits i have tried to use to drill it out have failed. What do you guys recommend to get the bolt out. Thanks for the help.?
They arent cutting and a few have brokenTungsten carbide would be my choice, but I'd use a reverse cut bit no matter what I was trying to remove.... 99% of the time the bolt will come out before you even have to try and get an easy-out in there.
When you say they've failed, are you breaking them or are they just not cutting?
they work well IF you can find em... a quality nitrided 10% cobalt bit (the gold ones in a black and decker set) should take it out...lh drill bit and drill slow, it'll catch and make the bolt back out
Thanks for the info Mike. Always happy to learn something newIf its broken off down inside a hole you may have to hit it with a small end mill to get a flat surface to drill into. The angle breaks are kind of a bitch. Tough to do on vehicle. Once you get a hole in it (I'd use a cobalt drill) using cutting oil at a relatively slow speed then soak in a 50-50 mix of acetone and atf (best thread release known to man) and use appropriate size easy out.