3mm Cobalt Drill Bit vs HARDOX 450 | CUT-IT Paste in Action

Drilling HARDOX 450 is one of the most demanding metalworking tasks. Designed to resist heavy wear in construction and mining equipment, HARDOX combines extreme hardness with high toughness. That same property makes it very difficult to cut or drill. Standard HSS drill bits quickly overheat, blunt, or snap when used on this type of abrasion-resistant steel.

This demo shows how the right tools overcome the challenge. Using an M35 cobalt drill bit with 5% cobalt content, the cutting edge stays sharp even under the intense heat of drilling HARDOX. Unlike coated drill bits, TTP HARD cobalt bits are solid M35 steel, ensuring their hot hardness extends throughout the body of the tool.

Equally important is lubrication. CUT-IT metal cutting paste is applied before drilling and again midway through the cut. When squealing begins — a sign of friction and work-hardening — a quick application of CUT-IT instantly restores smooth drilling, reduces heat, and extends bit life. Unlike thin oils that run off, CUT-IT clings to the bit, making it especially effective in vertical or overhead applications.

To replicate these results when drilling HARDOX 450 or other wear-resistant steels, follow these proven tips:

• Use a slower drill speed to minimize heat build-up.

• Apply firm but steady pressure — avoid forcing the bit.

• Always use a proper cutting paste for cooling and lubrication.

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

With the right cobalt drill bit, correct speed, and reliable lubrication, even HARDOX 450 can be drilled efficiently. Whether you’re a professional engineer or working on site repairs, TTP HARD cobalt drill bits and CUT-IT cutting paste deliver the cutting performance needed for the toughest jobs.