| ISO | Material | Material Designation | Material Condition | Hardness | Cutting Speed Recommendations (Vc) |
| K | 15 | Grey cast iron (GG) | Pearlitic/ferritic | 180 HB | 525-985 sfm |
| K | 16 | Grey cast iron (GG) | Pearlitic/martensitic | 260 HB | 460-920 sfm |
| K | 17 | Nodular cast iron (GGG) | Ferritic | 160 HB | 985-1970 sfm |
| K | 18 | Nodular cast iron (GGG) | Pearlitic | 250 HB | 820-1640 sfm |
| K | 19 | Malleable cast iron | Ferritic | 130 HB | 820-1310 sfm |
| K | 20 | Malleable cast iron | Pearlitic | 230 HB | 655-1050 sfm |
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