FRACTIONAL 3 Flute Drills Series Diameter (D1) 103 Vc (inch) Fractional Hardness (sfm) 1/8 1/4 3/8 1/2 5/8 3/4 ≤ 175 Bhn 295 RPM 9015 4508 3005 2254 1803 1503 or Fr 0.0026 0.0051 0.0077 0.0102 0.0128 0.0153 ≤ 7 HRc (236-354) Feed (ipm) 23.0 23.0 23.0 23.0 23.0 23.0 CARBON STEELS ≤ 300 Bhn 260 RPM 7946 3973 2649 1986 1589 1324 1018, 1040, 1080, 1090, or Fr 0.0023 0.0045 0.0068 0.0091 0.0113 0.0136 10L50, 1140, 1212, ≤ 32 HRc (208-312) 12L15, 1525, 1536 Feed (ipm) 18.0 18.0 18.0 18.0 18.0 18.0 ≤ 425 Bhn 150 RPM 4584 2292 1528 1146 917 764 or (120-180) Fr 0.0013 0.0026 0.0039 0.0052 0.0065 0.0079 P ≤ 45 HRc Feed (ipm) 6.0 6.0 6.0 6.0 6.0 6.0 ≤ 275 Bhn 230 RPM 7029 3514 2343 1757 1406 1171 or (184-276) Fr 0.0019 0.0038 0.0058 0.0077 0.0096 0.0115 ≤ 28 HRc Feed (ipm) 13.5 13.5 13.5 13.5 13.5 13.5 ALLOY STEELS ≤ 375 Bhn 145 RPM 4431 2216 1477 1108 886 739 4140, 4150, 4320, 5120, or (116-174) Fr 0.0019 0.0038 0.0058 0.0077 0.0096 0.0115 5150, 8630, 86L20, 50100 ≤ 40 HRc Feed (ipm) 8.5 8.5 8.5 8.5 8.5 8.5 ≤ 450 Bhn 115 RPM 3514 1757 1171 879 703 586 or (92-138) Fr 0.0005 0.0010 0.0015 0.0020 0.0026 0.0031 ≤ 48 HRc Feed (ipm) 1.8 1.8 1.8 1.8 1.8 1.8 ≤ 250 Bhn 85 RPM 2598 1299 866 649 520 433 or (68-102) Fr 0.0013 0.0026 0.0039 0.0052 0.0065 0.0079 ≤ 24 HRc Feed (ipm) 3.4 3.4 3.4 3.4 3.4 3.4 TOOL STEELS ≤ 375 Bhn 65 RPM 1986 993 662 497 397 331 H A2, D2, H13, L2, M2, or (52-78) Fr 0.0007 0.0013 0.0020 0.0026 0.0033 0.0039 P20, S7, T15, W2 ≤ 40 HRc Feed (ipm) 1.3 1.3 1.3 1.3 1.3 1.3 ≤ 475 Bhn 50 RPM 1528 764 509 382 306 255 or (40-60) Fr 0.0007 0.0013 0.0020 0.0026 0.0033 0.0039 ≤ 50 HRc Feed (ipm) 1.0 1.0 1.0 1.0 1.0 1.0 ≤ 220 Bhn 250 RPM 7640 3820 2547 1910 1528 1273 or (200-300) Fr 0.0026 0.0052 0.0079 0.0105 0.0131 0.0157 CAST IRONS ≤ 19 HRc Feed (ipm) 20.0 20.0 20.0 20.0 20.0 20.0 K Gray, Malleable, Ductile ≤ 330 Bhn 195 RPM 5959 2980 1986 1490 1192 993 or (156-234) Fr 0.0026 0.0052 0.0078 0.0104 0.0130 0.0156 ≤ 36 HRc Feed (ipm) 15.5 15.5 15.5 15.5 15.5 15.5 ≤ 80 Bhn 540 RPM 16502 8251 5501 4126 3300 2750 or (432-648) Fr 0.0032 0.0064 0.0096 0.0128 0.0161 0.0193 ALUMINUM ALLOYS ≤ 47 HRb Feed (ipm) 53.0 53.0 53.0 53.0 53.0 53.0 2017, 2024, 356, 455 RPM 13905 6952 4635 3476 2781 2317 6061, 7075 ≤ 150 Bhn or (364-546) Fr 0.0032 0.0065 0.0097 0.0129 0.0162 0.0194 ≤ 7 HRc Feed (ipm) 45.0 45.0 45.0 45.0 45.0 45.0 N 305 RPM 9321 4660 3107 2330 1864 1553 ≤ 140 Bhn or (244-366) Fr 0.0019 0.0039 0.0058 0.0077 0.0097 0.0116 COPPER ALLOYS ≤ 3 HRc Feed (ipm) 18.0 18.0 18.0 18.0 18.0 18.0 Alum Bronze, C110, 160 RPM 4890 2445 1630 1222 978 815 Muntz Brass ≤ 200 Bhn or (128-192) Fr 0.0016 0.0033 0.0049 0.0065 0.0082 0.0098 ≤ 23 HRc Feed (ipm) 8.0 8.0 8.0 8.0 8.0 8.0 Bhn (Brinell) HRc (Rockwell C) HRb (Rockwell B) rpm = Vc x 3.82 / D1 ipm = Fr x rpm reduce speed and feed 30 percent when using uncoated drills reduce speed and feed for materials harder than listed refer to the KYOCERA SGS Tool Wizard® for complete technical information (www.kyocera-sgstool.com) 308 DRILLS www.kDyRoIcLeLrSa-sgstool.com