| Group | Subgroup | Materials | Hardness (HRC) | Hardness (HB) | Tensile (N/mm²) |
|---|---|---|---|---|---|
| P | P.1 | Structural Steels • Case Hardening Steels Unalloyed Carbon Steels • Heat-Treatable Steels |
<24,5 | <250 | <850 |
| P.2 | Alloyed Steels | <31,6 | <300 | <1000 | |
| P.3 | Heat-Treatable Alloyed Steels | 31,6-42,8 | 300-400 | 1000-1300 | |
| P.4 | Wear-Resistant Materials | 42,8-50,8 | 400-500 | 1300-1800 | |
| P.5 | Ferritic-Martensitic Stainless | <34 | <320 | <1100 | |
| M | Austenitic Stainless | <24,5 | <250 | <850 | |
| K | K.1 | Grey Cast Iron | <200 | <700 | |
| K.2 | Nodular Cast Iron | <31,6 | >200-300 | >700-1000 | |
| S | Heat-Resistant Alloys (Titanium, Inconel...) | ||||
| N | N.1 | Copper • Bronze • Brass (Short Chip) | <200 | <700 | |
| N.2 | Copper • Bronze • Brass (Long Chip) | <200 | <700 | ||
| N.3 | Unalloyed Al • Mg | <100 | <350 | ||
| N.4 | Al Alloys Si < 10% | <180 | <600 | ||
| N.5 | Al Alloys Si > 10% | <180 | <600 | ||
| N.6 | Thermoplastics | ||||
| N.7 | Hard Plastics | ||||
| F | Fiber Composites (CFRP, GFRP, Honeycomb...) | ||||
| H | Heat-Treated Alloys | 45-70 |