Cobalt bits are not coated, they are cobalt steel through and through. At the end of manufacture a cobalt bit is baked in an oven to turn the surface color of the steel a dull gold color. This is done primarily for easy identification by color. If the gold wears off or is ground off in sharpening on a cobalt bit, it is still solid cobalt steel. Our cobalt drill bits are made of M35 cobalt steel which has 5 percent cobalt content. The Rockwell is approximately 65.5 to 67 Rockwell C. Irwin titanium drill bits have a hardness of approximately 64.5 to 65.5 Rockwell C. The titanium coating is much harder at approximately 82 Rockwell C. If you sharpen a cobalt bit it is still as good as a new bit, assuming it was sharpened correctly. If you sharpen a titanium bit its performance will drop because the coating is gone on the tip; however, you still have the benefit of the titanium coating in the flute of the bit and on the sides of the bit. It will still perform better than a standard bit.
Articles in this section
- What is the process for sending an invention or idea to someone for consideration?
- What does the 'Bi-Metal' mean when referring to a utility blade?
- IRWIN Taps & Dies information:
- When would I use a tap and die set and how would I properly use them?
- When would I use a tap and die set and how would I properly use them?
- I was trying to tap a hole in aluminum with a 1/4" tap. Half of the tap broke off in the workpiece. How do I get it out?
- How do you support or validate the "3x Durability" Claim?
- Why is there a slot in the front of the end hook?
- Why the Optic-White(TM) blade color?
- What is the Diamond symbol every 19'-2" increment?
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