Roughing Cut Cobalt High Speed Steel List 470: Regular Length - Multiple Flute - Center Hole Side Milling Hardness Up to 20 HRC 20 to 30 HRC 30 to 40 HRC 40 to 50 HRC – Medium Tensile Steels(up to 115 x 103 Lb/in2)Work MaterialMild Steel ForgingsCast IronBrass and BronzeCopperHigh Tensile Steels(115 x 103~145 x 103 Lb/in2)Unalloyed TitaniumHeat ResistantFerritic Low AlloysHigh Tensile Steels(145 x 103 ~200 x 103 Lb/in2)Tool SteelsMedium StrengthStainless Steels andTitanium AlloysHeat Resistant HighAlloysHigh StrengthStainless Steels andTitanium AlloysAluminumAlloyed AluminumPlasticsWoods Cutting Speed 80-100 SFM 60-75 SFM 40-55 SFM 26-40 SFM 195-330 SFM Mill Dia. Speed Feed Speed Feed Speed Feed Speed Feed Speed FeedRPMin/minRPMin/minRPMin/minRPMin/minRPMin/min 1/4 1,320 2.1 1,000 1.3 750 0.9 500 0.5 4,000 8.9 5/16 1,060 2.4 800 1.5 600 1.0 400 0.5 3,150 9.9 3/8 950 2.3 710 1.5 530 1.0 355 0.6 2,800 10.5 1/2 670 3.0 500 1.9 375 1.1 250 0.8 2,000 12.4 5/8 600 3.4 400 2.1 300 1.4 200 0.8 1,600 14.0 3/4 475 3.5 355 2.3 265 1.4 180 0.9 1,400 14.8 7/8 375 3.5 280 2.3 212 1.4 140 0.9 1,120 14.8 1 335 3.4 250 2.1 190 1.4 125 0.8 1,000 14.0 1-1/8 300 3.1 224 2.0 170 1.3 112 0.8 900 13.3 1-1/4 265 3.8 200 2.4 150 1.5 100 1.0 800 15.8 1-1/2 212 3.4 160 2.1 118 1.4 80 0.9 630 14.0 1-3/4 190 3.1 140 2.0 106 1.3 71 0.8 560 13.3 2 170 2.9 125 1.8 95 1.1 63 0.8 500 11.8 1/2” up to 1 1/8”; aa= 1.5 x D, ar= 0.3 x D 1 1/4” up to 2”; aa= 1 x D, ar= 0.3 x D 1120 End Mill Technical WWW.OSGTOOL.COM