ISO | Material | Material Designation | Material Condition | Hardness | Cutting Speed Recommendations (Vc) |
N | 21 | Aluminum-wrought alloys | Not hardenable | 60 HB | 1970-8200 sfm |
N | 22 | Aluminum-wrought alloys | Hardenable | 100 HB | 1970-8200 sfm |
N | 23 | Aluminum-cast alloys <=12% Si | Not hardenable | 75 HB | 1970-8200 sfm |
N | 24 | Aluminum-cast alloys <=12% Si | Hardenable | 90 HB | 1970-8200 sfm |
N | 25 | Aluminum-cast alloys >12% Si | High temperature | 130 HB | 1640-3935 sfm |
N | 26 | Copper alloys >1% Pb | Free cutting | 110 HB | 1970-3280 sfm |
N | 27 | Copper alloys | Brass | 90 HB | 1970-2625 sfm |
N | 28 | Copper alloys | Electrolytic copper | 100 HB | 1970-2625 sfm |
N | 29 | Non metallic. | Duro& fiber plastics | | 2625-6560 sfm |
N | 30 | Non metallic | Hard rubber | | 1970-3935 sfm |