ISO | Material | Material Designation | Material Condition | Hardness | Cutting Speed Recommendations (Vc) |
N | 25 | Aluminum-cast alloys >12% Si | High temperature | 130 HB | 985-2950 sfm |
N | 26 | Copper alloys >1% Pb | Free cutting | 110 HB | 1970-3935 sfm |
N | 29 | Non metallic. | Duro& fiber plastics | | 260-3280 sfm |