PREMIUM CARBIDE MILL SPEED FEED 4 F1ute Ball Nose End Mills CHARTS Aluminum Alloys Carbon Steels Alloy Steels Tool Steels 285 275 Bhn Cast Iron RPM 7300 4900 3600 2900 2400 1800 1430 1200 1000 920 810 730 O 3D Material Hardness Diameter 3 32 1 8 5 32 3 16 1 4 5 16 3 8 1 2 9 16 5 8 11 16 13 16 Carbon Steels Alloy Steels Tool Steels