Bits are coated after sharpening with a thin layer of titanium nitride which
is a hard material.

see http://en.wikipedia.org/wiki/Titanium_nitride for more detail.


"claude" wrote in message ...
Is there someone out there who can clarify a mystery for me. I have just
bought all sorts of titanium drill bits and have other tools that they say
contain titanium. I don't get it, working on a titanium aircraft part with
a normal chrome molly tool will destroy that titanium part. So how can
they alloy or coat a drill bit that won't react to itself or to the part
you are working on at the molecular level? The only explanation I can
think of right now is that the titanium they mention is bull and is just a
fancy colored coating.

The tools work well enough but I am a very curious individual.

Claude
Montreal