Best drill bits to drill metal bolts

[KamKarts]

Any brands better then others?

 

[mckutzy]

Steel or stainless??? They are metal... but what kind...

 

[Hellion]

Titanium tipped bits?

 

[Kartorbust]

If you're doing a lot of drilling into metal, spend the money on M35 or M42 Cobalt high speed drill bits. They'll last a long time compared to normal high speed steel drill bits. Expensive but worth the money.

 

[supermanotorious]

yup, for my stupid specific thread tapping bits, cobalt all day

 

[Hellion]

He's got a broken bolt on a TAV--sheared the head clean off. He started this thread specifically for this issue.

 

[Kartorbust]

Hmmm well if it's a grade 5 or less that broke off, it shouldn't be too much of a pain to use a regular high speed steel bit to drill it out. But part of the problem maybe that it doesn't drill out right and may need to be retapped.

 

[KamKarts]

Drill out and re tap is what I had to do.... to late for a test run... will update soon

---------- Post added at 09:48 PM ---------- Previous post was at 09:47 PM ----------

Used reg high speed bit

---------- Post added at 09:56 PM ---------- Previous post was at 09:48 PM ----------

I'd like 2 thank everyone for the ideas and info

 

[pearl111]

When ever I drill metal I always use oil so that the bit cuts better. Sometimes I use plenty of it and always take time to stop and let your bit cool down a little. This helps cheap bits drill better and last longer.

I have good bits and I still do this with them. They drill better and last longer.

 

[Neal collins]

Get a reverse cutting bit most of the tine it will catch and screw the broke bolt out five done it quite a few