Drill Bit Chooser
Specialist metal drilling

What drill bit is suitable for hardened steel?

Tool catalogs rate particular carbide drill series for defined hardened-material ranges. A rating for one product family is not a general rating for every carbide bit.

Quick answer

There is no honest universal bit recommendation for an unidentified hardened steel. Specialist carbide drills can be designed for particular hardness ranges and machines, but you must know the workpiece hardness and have a suitable rigid setup.

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Interactive selector

Find a bit for your setup

Answer only the questions that change the selection. If the combination is not documented, the tool will say so.

The material is preselected. Use the safety options below if the work involves an anchor, services or structural elements.

Anchor / safety details (important for wall drilling)

Loading documented selection rules…

This does not verify workpiece condition, bit stock length, chuck capacity, structural loads or exact cutting speed. Follow the chosen manufacturer’s specification and use appropriate eye, hearing, workpiece and dust protection.

What changes the bit choice?

Hardness is a real constraint

Tool catalogs rate particular carbide drill series for defined hardened-material ranges. A rating for one product family is not a general rating for every carbide bit.

Machine rigidity changes the answer

A rigid machine setup and proper holding matter. General advice for a hand drill should not be substituted for tool-specific machining parameters.

A stop result is useful

If the steel grade or heat treatment is unknown, avoid wasting expensive bits or damaging the workpiece. Identify it and consult the manufacturer or a machinist.

Common mistakes to avoid

  • Interpreting “cobalt” as a guarantee for every hardened alloy.
  • Assuming all carbide drills are suitable for handheld drilling.
  • Copying feeds and speeds from an unrelated tool series.

Frequently asked questions

Can a cobalt bit drill hardened steel?

Some materials and conditions may be workable, but the phrase “hardened steel” is too broad to support that blanket recommendation.

Why does the tool stop rather than select a bit?

Without hardness, geometry and a compatible machine, a confident recommendation would be misleading.

Need a different material? Browse all ten material guides. Interested in wall fixings? Read our anchor-size warning and workflow.