Drilling stainless steel is one of the most common challenges faced in workshops, fabrication shops, and on-site installations. Unlike mild steel, stainless steel is designed to resist corrosion and withstand high temperatures, which also makes it extremely difficult to cut or drill. Standard high-speed steel (HSS) drill bits often fail in this material — they dull quickly, overheat, or even snap after just a few holes.

This video demonstrates the difference when using TTP HARD cobalt drill bits. Manufactured from M35 grade steel with 5% cobalt content distributed throughout the entire body of the bit (not just a coating), these bits are engineered to drill the hardest, most heat-resistant metals. In the demo, a single cobalt bit drills approximately 15 holes in stainless steel without losing its sharpness or suffering tip damage. The long, continuous swarf coming off the bit is clear evidence of efficient cutting action and proper drilling technique.

Equally important in this process is lubrication. Using CUT-IT metal cutting paste helps to prevent overheating, reduces friction, and allows the drill bit to maintain its edge far longer than when drilling dry. Unlike liquid lubricants that can drip away, CUT-IT paste adheres to the drill bit, making it especially effective in both vertical and overhead drilling situations.

To achieve similar results when drilling stainless steel, we recommend following these proven tips:

• Drill at a slower speed to reduce heat build-up.

• Apply steady, moderate pressure rather than forcing the bit.

• Always use plenty of lubricant to cool the cutting surface.

• Drill in short bursts, withdrawing the bit occasionally to clear swarf.

By combining the right technique with the right tools, even one of the most difficult metals to drill becomes manageable. Whether you are a professional engineer, a mechanic, or a DIY enthusiast, using TTP HARD cobalt drill bits and CUT-IT cutting paste ensures smooth drilling, consistent performance, and maximum tool life.