Broken bolt. (cussing) Need suggestions...

I twisted off a 5/16 course allen head bolt in my chassis today. I thought I would just drill it out and re-tap the hole, but so far it just makes my drill bits smoke. What do I need to do?

-Brian

 

3 possibilities that get tried in my shop:
1-left hand drill bit
2-use extract a screw set
3-place a 3/8 nut centered over broken leftovers and weld them together, than put wrench on it and screw out

 

broken bolt

try a very hard dill bit and turn it slow with cutting oil
d jackson

 

get a carbide drill bit
left hand bits sometime work

 

Bust out the welder. Stack up a bead till you can get a grip on it. The heat will loosen it right up.

 

Bolt out!!!

I have two sets of drill bits, silver and black. Silver bits smoke. Black bits with cutting oil made chips. I started with a small bit, and worked my way up in steps until I was at the proper bit size to tap a 5/16 hole. Ran a tap through what was left to clean the threads.

Thanks for the suggestions guys. I had already heated the threaded boss to try to get the bolt to break loose, but it still wouldn't budge. That's how I broke it in the first place.

-Brian

 

Congrats! I love a happy ending.

 

next time use a can of freon and spray it on the broken bolt and you can use your fingers to turn it out..Dave

 

putting a nut over it weld the nut to it and be done will work great i seen an old timer do that years ago and i have been doing it that away ever since