FRACTIONAL 6 Flute Countersink Series DC • in 606 Vc Fractional Hardness (sfm) 1/8 3/16 1/4 3/8 1/2 3/4 1 35 RPM 1070 713 535 357 267 178 134 ≤ 250 Bhn or Fr 0.0006 0.0008 0.0011 0.0017 0.0022 0.0034 0.0045 ≤ 24 HRc (28-42) Feed (ipm) 0.6 0.6 0.6 0.6 0.6 0.6 0.6 25 RPM 764 509 382 255 191 127 96 TOOL STEELS ≤ 375 Bhn H A2, D2, H13, L2, M2, or Fr 0.0003 0.0004 0.0005 0.0008 0.0010 0.0016 0.0021 P20, S7, T15, W2 ≤ 40 HRc (20-30) Feed (ipm) 0.2 0.2 0.2 0.2 0.2 0.2 0.2 20 RPM 611 407 306 204 153 102 76 ≤ 475 Bhn or Fr 0.0003 0.0005 0.0007 0.0010 0.0013 0.0020 0.0026 ≤ 50 HRc (16-24) Feed (ipm) 0.2 0.2 0.2 0.2 0.2 0.2 0.2 Bhn (Brinell)  HRc (Rockwell C)  HRb (Rockwell B) rpm = Vc x 3.82 / DC ipm = Fr x rpm reduce speed and feed for materials harder than listed refer to the SGS Tool Wizard® for complete technical information (www.kyocera-sgstool.com) www.kyoceraD-sRgILsLtoSol.com DRILLS 325