FRACTIONAL 2 Flute Drills Series Diameter (D1) 101 Vc (inch) Fractional Hardness (sfm) 1/64 1/32 1/16 1/8 1/4 3/8 1/2 ≤ 175 Bhn 265 RPM 64787 32394 16197 8098 4049 2699 2025 or Fr 0.00021 0.0004 0.0008 0.0017 0.0033 0.0050 0.0067 ≤ 7 HRc (212-318) Feed (ipm) 13.5 13.5 13.5 13.5 13.5 13.5 13.5 CARBON STEELS ≤ 300 Bhn 125 RPM 30560 15280 7640 3820 1910 1273 955 1018, 1040, 1080, 1090, or Fr 0.00020 0.0004 0.0008 0.0016 0.0031 0.0047 0.0063 10L50, 1140, 1212, ≤ 32 HRc (100-150) 12L15, 1525, 1536 Feed (ipm) 6.0 6.0 6.0 6.0 6.0 6.0 6.0 ≤ 425 Bhn 85 RPM 20781 10390 5195 2598 1299 866 649 or (68-102) Fr 0.00011 0.0002 0.0004 0.0008 0.0017 0.0025 0.0034 ≤ 45 HRc Feed (ipm) 2.2 2.2 2.2 2.2 2.2 2.2 2.2 P ≤ 275 Bhn 230 RPM 56230 28115 14058 7029 3514 2343 1757 or (184-276) Fr 0.00019 0.0004 0.0007 0.0015 0.0030 0.0045 0.0060 ≤ 28 HRc Feed (ipm) 10.5 10.5 10.5 10.5 10.5 10.5 10.5 ALLOY STEELS ≤ 375 Bhn 145 RPM 35450 17725 8862 4431 2216 1477 1108 4140, 4150, 4320, 5120, or (116-174) Fr 0.00019 0.0004 0.0007 0.0015 0.0030 0.0045 0.0060 5150, 8630, 86L20, 50100 ≤ 40 HRc Feed (ipm) 6.6 6.6 6.6 6.6 6.6 6.6 6.6 ≤ 450 Bhn 60 RPM 14669 7334 3667 1834 917 611 458 or (48-72) Fr 0.00008 0.0002 0.0003 0.0007 0.0013 0.0020 0.0026 ≤ 48 HRc Feed (ipm) 1.2 1.2 1.2 1.2 1.2 1.2 1.2 ≤ 250 Bhn 85 RPM 20781 10390 5195 2598 1299 866 649 or (68-102) Fr 0.00011 0.0002 0.0004 0.0009 0.0018 0.0027 0.0035 ≤ 24 HRc Feed (ipm) 2.3 2.3 2.3 2.3 2.3 2.3 2.3 TOOL STEELS ≤ 375 Bhn 55 RPM 13446 6723 3362 1681 840 560 420 H A2, D2, H13, L2, M2, or (44-66) Fr 0.00005 0.0001 0.0002 0.0004 0.0008 0.0012 0.0017 P20, S7, T15, W2 ≤ 40 HRc Feed (ipm) 0.7 0.7 0.7 0.7 0.7 0.7 0.7 ≤ 475 Bhn 40 RPM 9779 4890 2445 1222 611 407 306 or (32-48) Fr 0.00005 0.0001 0.0002 0.0004 0.0008 0.0012 0.0016 ≤ 50 HRc Feed (ipm) 0.5 0.5 0.5 0.5 0.5 0.5 0.5 ≤ 220 Bhn 280 RPM 68454 34227 17114 8557 4278 2852 2139 or (224-336) Fr 0.00026 0.0005 0.0010 0.0020 0.0041 0.0061 0.0082 CAST IRONS ≤ 19 HRc Feed (ipm) 17.5 17.5 17.5 17.5 17.5 17.5 17.5 K Gray, Malleable, Ductile ≤ 330 Bhn 250 RPM 61120 30560 15280 7640 3820 2547 1910 or (200-300) Fr 0.00025 0.0005 0.0010 0.0020 0.0041 0.0061 0.0081 ≤ 36 HRc Feed (ipm) 15.5 15.5 15.5 15.5 15.5 15.5 15.5 ≤ 250 Bhn 210 RPM 51341 25670 12835 6418 3209 2139 1604 or (168-252) Fr 0.00015 0.0003 0.0006 0.0012 0.0024 0.0036 0.0048 STAINLESS STEELS ≤ 24 HRc Feed (ipm) 7.7 7.7 7.7 7.7 7.7 7.7 7.7 (FREE MACHINING) 110 RPM 26893 13446 6723 3362 1681 1121 840 303, 416, 420F, 430F 440F ≤ 330 Bhn or (88-132) Fr 0.00009 0.0002 0.0004 0.0007 0.0015 0.0022 0.0030 ≤ 36 HRc Feed (ipm) 2.5 2.5 2.5 2.5 2.5 2.5 2.5 M 65 RPM 15891 7946 3973 1986 993 662 497 ≤ 275 Bhn STAINLESS STEELS or (52-78) Fr 0.00010 0.0002 0.0005 0.0009 0.0018 0.0025 0.0035 (DIFFICULT) ≤ 28 HRc Feed (ipm) 1.7 1.7 1.7 1.7 1.7 1.7 1.7 304, 316, 321, 13-8 PH, 55 RPM 13446 6723 3362 1681 840 560 420 15-5PH, 17-4 PH, ≤ 375 Bhn Custom 450 or Fr 0.00010 0.0002 0.0004 0.0008 0.0015 0.0023 0.0031 ≤ 40 HRc (44-66) Feed (ipm) 1.3 1.3 1.3 1.3 1.3 1.3 1.3 continued on next page 296 DRILLS www.kDyRoIcLeLrSa-sgstool.com