Single End Cobalt High Speed Steel List 581: Regular Length - Multiple Flute - Center Hole Side Milling with 4FL, 6FL Hardness Up to 145 Brinell Up to 20 HRC 20 to 30 HRC 30 to 40 HRC 40 to 50 HRC – Work Material Mild SteelsHard BrassBronzeCast IronMed. Carbon Steels Med. Strength Titanium Alloys Med. Strength Stainless Steels High Carbon Steel Titanium Alloys High Strength Stainless SteelsHeat ResistantHigh AlloysAustenitic AlloysNickel Base AlloysHeat ResistantHigh AlloysHigh StrengthStainless SteelsTitanium AlloysAluminumAluminum Alloys Cutting Speed 130-165 SFM 105-125 SFM 65-85 SFM 30-50 SFM 16-32 SFM 450-590 SFM Mill Dia. Speed Feed Speed Feed Speed Feed Speed Feed Speed Feed Speed FeedRPMin/minRPMin/minRPMin/minRPMin/minRPMin/minRPMin/min 3 5,300 9.8 4,000 7.5 2,650 3.7 1,600 1.8 800 0.8 18,000 31.5 4 3,750 11.8 2,800 8.8 1,900 4.2 1,120 2.1 630 0.9 12,500 35.4 5 3,000 13.2 2,240 9.8 1,500 4.6 900 2.4 500 1.0 10,000 39.4 6 2,650 14.0 2,000 10.4 1,320 4.9 800 2.5 400 1.1 9,000 39.4 8 1,900 16.7 1,400 12.4 950 5.9 560 3.0 315 1.3 6,300 46.5 10 1,500 18.7 1,120 14.0 750 6.7 450 3.3 280 1.4 5,000 49.2 12 1,180 17.7 900 13.2 600 6.3 355 3.3 200 1.5 4,000 46.5 14 1,060 16.7 800 12.4 530 6.3 315 3.5 180 1.5 3,550 44.1 16 950 15.7 710 11.8 475 6.3 280 3.5 160 1.4 3,150 41.7 18 850 15.7 630 11.0 425 5.9 250 3.5 140 1.4 2,800 41.7 20 750 14.8 560 9.8 375 5.9 200 3.1 140 1.4 2,500 39.4 22 670 14.0 500 8.8 335 5.2 180 2.8 112 1.4 2,000 33.5 24 600 13.2 450 7.9 300 4.6 160 2.5 100 1.4 1,800 31.5 25 600 13.2 450 7.9 300 4.6 160 2.5 100 1.4 1,800 31.5 26 600 13.2 450 7.9 300 4.6 160 2.5 90 1.5 1,800 31.5 28 530 11.8 400 7.1 265 4.2 140 2.2 80 1.3 1,600 29.5 30 530 11.8 400 7.1 265 4.2 140 2.2 71 1.1 1,600 29.5 32 475 10.2 355 6.3 236 3.7 125 2.0 71 1.1 1,400 26.4 35 425 9.8 315 5.5 212 3.3 112 1.8 63 1.0 1,250 24.8 36 425 9.8 315 5.5 212 3.3 112 1.8 63 1.0 1,250 24.8 40 375 9.3 280 4.9 190 3.0 100 1.6 56 1.4 1,120 22.0 45 335 9.8 250 5.5 170 3.3 90 1.8 56 1.4 1,000 24.8 50 300 8.8 224 4.9 150 3.0 80 1.6 50 1.3 900 22.0 1.5 D Aa = 1.5 D Ar = 0.1 D .1D WWW.OSGTOOL.COM End Mill Technical 1133