HSS-CO End Mills 2 Flute Standard 2 Flute HSS-Co Slotting Hardness Up to 145 Brinell 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 50-65 SFM Mill Dia. SpeedRPM IPT Feed Speedin/minRPM IPT Feed Speedin/minRPM IPT Feedin/min 1/64 20,000 0.00002 1.0 20,000 0.00002 0.9 14,000 0.00001 0.5 1/32 16,000 0.00007 2.3 11,800 0.00006 1.5 7,100 0.00005 0.8 3/64 10,000 0.00014 2.8 7,500 0.00012 1.9 4,500 0.00010 0.9 1/16 8,000 0.00020 3.3 6,000 0.00018 2.1 3,550 0.00014 1.0 5/64 6,300 0.00028 3.5 4,750 0.00025 2.4 2,800 0.00020 1.1 3/32 5,000 0.00040 4.0 3,750 0.00035 2.6 2,240 0.00028 1.3 7/64 4,500 0.00047 4.3 3,350 0.00042 2.9 2,000 0.00033 1.4 1/8 4,000 0.00056 4.5 3,000 0.00050 3.0 1,800 0.00040 1.5 9/64 3,550 0.00067 4.8 2,650 0.00060 3.1 1,600 0.00047 1.5 5/32 3,150 0.00080 5.0 2,360 0.00071 3.4 1,400 0.00056 1.6 11/64 2,800 0.00095 5.4 2,120 0.00085 3.6 1,250 0.00067 1.6 3/16 2,500 0.00110 5.5 1,900 0.00100 3.8 1,120 0.00080 1.8 1/4 2,000 0.00160 6.4 1,500 0.00140 4.3 900 0.00112 2.0 5/16 1,600 0.00224 7.1 1,180 0.00200 4.8 710 0.00160 2.3 3/8 1,400 0.00265 7.4 1,060 0.00236 5.0 630 0.00190 2.4 7/16 1,120 0.00335 7.5 850 0.00300 5.1 500 0.00250 2.5 1/2 1,000 0.00375 7.5 750 0.00315 4.8 450 0.00265 2.4 9/16 900 0.00400 7.3 670 0.00355 4.8 400 0.00300 2.4 5/8 800 0.00425 6.8 600 0.00375 4.5 355 0.00335 2.4 11/16 710 0.00475 6.8 530 0.00400 4.3 315 0.00355 2.3 3/4 710 0.00475 6.8 530 0.00400 4.3 315 0.00355 2.3 13/16 630 0.00500 6.3 475 0.00400 3.8 280 0.00400 2.3 7/8 560 0.00530 5.9 425 0.00400 3.4 250 0.00400 2.0 15/16 500 0.00560 5.6 375 0.00400 3.0 224 0.00400 1.8 1 500 0.00560 5.6 375 0.00400 3.0 224 0.00400 1.8 1-1/8 450 0.00560 5.0 335 0.00400 2.6 200 0.00400 1.6 1-1/4 400 0.00600 4.8 300 0.00400 2.4 180 0.00400 1.5 1-3/8 355 0.00600 4.3 265 0.00400 2.1 160 0.00400 1.3 1-1/2 315 0.00630 4.0 236 0.00400 1.9 140 0.00400 1.1 1-5/8 315 0.00630 4.0 236 0.00400 1.9 140 0.00400 1.1 1-3/4 280 0.00630 3.5 212 0.00400 1.8 125 0.00400 1.0 1-7/8 250 0.00630 3.1 190 0.00400 1.5 112 0.00400 0.9 2 250 0.00630 3.1 190 0.00400 1.5 112 0.00400 0.9 1) Speeds and Feeds for Lists 520, 522, 540, 541, 542, 543, 548, 620 and 641 2) Reduce Speeds and Feeds 5-10% for Lists 525, 527, 547 3) Reduce Speeds and Feeds 10-20% for Lists 545 and 557 4) Increase Speeds and Feeds 5-15% for Lists 530 and 535 (Aluminum only) 5) Increase Speeds and Feeds 10-20% for List 529 6) Speeds can be increased up to 20% for 520TiN, 522TiN, 540TiN, and 542TiN 7) Speeds can be increased up to 15% for Lists 541TiN/TiCN and 548 TiCN WWW.OSGTOOL.COM End Mill Technical 1127