Reference library · ISO material groups

ISO Material Groups

26 material sub-groups across six ISO colour-coded categories. Each page covers hardness range, tooling guidance, and a direct link into the AI advisor for your specific cutting parameters. Guidance is drawn from standard machining references — verify insert selection on a sample part before production.

ISO P — Steels

CVD-coated carbide at Vc 200–400 m/min. Positive geometry for finishing, negative for roughing.

ISO M — Stainless Steel

Work hardening is the main challenge. Sharp positive geometry, high-pressure coolant 15–20 bar, consistent DOC.

ISO K — Cast Iron

CVD alumina coatings excel. Dry machining acceptable for grey CI. Abrasive wear is the main failure mode.

ISO N — Non-Ferrous

Uncoated or DLC carbide for aluminium. Sharp edges, high positive rake, polished flutes prevent BUE.

ISO S — Superalloys & Titanium

Most difficult ISO group. High-pressure coolant mandatory. Low Vc, consistent DOC, sharp positive geometry.

ISO H — Hardened Steel

CBN/PCBN required above 55 HRC. Dry machining preferred — coolant causes thermal shock.