![]() ![]() With titanium nitride, you have to remember it only coats the bit. For metal drilling, we definitely put these as the bare minimum. It beats black oxide in that it increases surface hardness and does a better job reducing heat while drilling through metal. Cobalt (Steel Blend)ĭrill bits made with a Titanium nitride coating resists corrosion and friction. Step 4: You can apply machine oil afterward to the bits.Step 3: Scrub any debris off the bits by using a toothbrush. ![]()
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