HSS-CO End Mills 4 & 6 Flute Standard 4 Flute and 6 Flute HSS-Co Side Milling Hardness Up to 145 BHN Up to 20 HRC 20 to 30 HRC Mild SteelsWork MaterialBrassBronze Medium Tensile SteelsMild Steel ForgingsCast IronHard Brass and BronzeCopperHigh Tensile SteelsUnalloyed TitaniumHeat ResistantFerritic Low Alloys Cutting Speed 80-150 SFM 80-110 SFM 16-32 SFM Mill Dia. SpeedRPM IPT Feed Speedin/minRPM IPT Feed Speedin/minRPM IPT Feedin/min 1/16 9,000 0.00020 7.3 7,100 0.00018 5.1 4,500 0.00014 2.5 5/64 7,100 0.00028 8.0 5,600 0.00025 5.6 3,550 1.00020 2.9 3/32 5,600 0.00040 9.0 4,500 0.00036 6.4 2,800 1.00028 3.1 7/64 5,000 0.00048 9.5 4,000 0.00043 6.8 2,500 0.00034 3.4 1/8 4,500 0.00056 10.1 3,550 0.00050 7.1 2,240 0.00040 3.6 9/64 4,000 0.00067 10.8 3,150 0.00060 7.5 2,000 0.00048 3.8 5/32 3,550 0.00080 11.4 2,800 0.00071 8.0 1,800 0.00056 4.0 11/64 3,150 0.00095 12.0 2,500 0.00085 8.5 1,600 0.00067 4.3 3/16 2,800 0.00110 12.4 2,240 0.00100 9.0 1,400 0.00080 4.5 1/4 2,240 0.00160 14.4 1,800 0.00140 10.1 1,120 0.00112 5.0 5/16 1,800 0.00224 16.1 1,400 0.00200 11.3 900 0.00160 5.8 3/8 1,600 0.00265 17.0 1,250 0.00236 11.8 800 0.00190 6.1 7/16 1,250 0.00335 16.8 1,000 0.00300 12.0 630 0.00250 6.3 1/2 1,120 0.00375 16.8 900 0.00315 11.4 560 0.00265 5.9 9/16 1,000 0.00400 16.0 800 0.00355 11.4 500 0.00300 6.0 5/8 900 0.00425 15.3 710 0.00375 10.6 450 0.00335 6.0 11/16 800 0.00475 15.3 630 0.00375 9.5 400 0.00355 5.6 3/4 800 0.00475 15.3 630 0.00375 9.5 400 0.00355 5.6 13/16 710 0.00500 14.3 560 0.00375 8.4 355 0.00400 5.6 7/8 630 0.00530 13.4 500 0.00375 7.5 315 0.00400 5.0 15/16 560 0.00560 12.5 450 0.00375 6.8 280 0.00400 4.5 1 560 0.00560 12.5 450 0.00375 6.8 280 0.00400 4.5 1-1/8 500 0.00560 11.3 400 0.00375 6.0 250 0.00400 4.0 1-1/4 450 0.00600 10.8 355 0.00375 5.4 224 0.00400 3.6 1-3/8 400 0.00600 9.6 315 0.00375 4.8 200 0.00400 3.3 1-1/2 355 0.00630 9.0 280 0.00375 4.3 180 0.00400 2.9 1-3/4 315 0.00630 11.9 250 0.00375 5.6 160 0.00400 3.9 2 280 0.00630 10.6 224 0.00375 5.0 140 0.00400 3.4 1) Speeds and Feeds for Lists 540, 541, 542, 543, 547, 548, 575, and 641 2) Reduce Speeds and Feeds 15-20% for Lists 557 3) Reduce Speeds and Feeds 10-15% for Lists 545, 546, 558 and 646 4) Increase Speeds and Feeds 5-15% for Lists 549 WWW.OSGTOOL.COM End Mill Technical 1129