| ISO | Material | Material Designation | Material Condition | Hardness | Cutting Speed Recommendations (Vc) |
| N | 21 | Aluminum-wrought alloy | Not cureable | 60 HB | 300-445 m/min |
| N | 22 | Aluminum-wrought alloy | Cured | 100 HB | 260-405 m/min |
| N | 23 | Aluminum-cast, alloyed <12% Si | Not cureable | 75 HB | 300-445 m/min |
| N | 24 | Aluminum-cast, alloyed | Cured | 90 HB | 260-405 m/min |
| N | 25 | Aluminum-cast, alloyed >12% Si | High temperature | 130 HB | 180-285 m/min |
| N | 26 | Copper alloys >1% Pb | Free cutting | 110 HB | 180-285 m/min |
| N | 27 | Copper alloys | Brass | 90 HB | 180-285 m/min |
| N | 28 | Copper alloys | Electrolytic copper | 100 HB | 140-245 m/min |
| N | 29 | Non metallic | Duro& fiber plastics | 60 HB | 120-250 m/min |
| N | 30 | Non metallic | Hard rubber | 55 HB | 120-250 m/min |