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Material Selection Guide for Precision CNC Parts

Most material arguments are really arguments about one dominant requirement. Name that requirement first, and the shortlist usually becomes obvious.

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Side-by-side

Comparison

Dominant requirementFirst choiceAlso consider
Lowest weightAluminumTitanium (if strength matters)
Corrosion / hygieneStainless 316LTitanium Grade 2
Highest strength-to-weightTitanium (Grade 5)17-4PH stainless
High-temperature strengthInconel 625 / 718Titanium (moderate)
Dimensional stability vs temperatureInvar 36Kovar (if glass seal)
Glass/ceramic sealingKovar—
Maximum densityTungsten heavy alloy—
Low friction without lubricationPOM / PEEKPTFE (light load only)
Chemical inertnessPTFE / PEEKPVDF
Electrical insulationEngineering plastics—
Decision guide

How to decide

  • Start from the single requirement that would make the part fail, not from the material you used last time.
  • Where two requirements conflict, decide which one is allowed to give. That decision picks the material.
  • Bring the drawing early - a DFM review often shows a geometry change that removes the need for an exotic material.
FAQ

Frequently asked questions

Yes. Send the drawing and the dominant requirement; we will propose materials and flag risk in a DFM review before quoting.
That is the normal case. We rank the requirements with you and pick the material that survives the one that cannot be compromised.
Yes - EN 10204 3.1 certificates are available, and material grade is confirmed by in-house spectrometer verification on critical batches.
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