® Ap Series Diameter (D1) 51M, 51MCR, Ae Ae (mm) 51ML, 51MLC Vc Metric Hardness Ae x D1 Ap x D1 (m/min) 6 8 10 12 16 20 Profile 219 RPM 11633 8725 6980 5816 4362 3490 ≤ 0.1 ≤1 Fz 0.048 0.081 0.101 0.121 0.142 0.158 CARBON STEELS (176-263) 1018, 1040, 1080, ≤ 275 Bhn Feed (mm/min) 3350 4240 4230 4223 3717 3308 1090, 10L50, 1140, or Speed & Feed Recommendations 1212, 12L15, 1525, ≤ 28 HRc 279 RPM 14784 11088 8870 7392 5544 4435 1536 HSM ≤ 0.05 ≤2 Fz 0.066 0.113 0.141 0.169 0.197 0.220 (223-335) Feed (mm/min) 5854 7517 7504 7495 6553 5854 P 149 RPM 7917 5938 4750 3958 2969 2375 Profile ≤ 0.1 ≤1 Fz 0.036 0.061 0.077 0.092 0.107 0.119 ALLOY STEELS (119-179) 4140, 4150, 4320, ≤ 375 Bhn Feed (mm/min) 1710 2173 2195 2185 1906 1696 5120, 5150, 8630, or 86L20, 50100 ≤ 40 HRc 189 RPM 10017 7513 6010 5009 3756 3005 HSM ≤ 0.05 ≤2 Fz 0.049 0.083 0.104 0.125 0.146 0.163 (151-227) Feed (mm/min) 2945 3741 3750 3756 3291 2939 73 RPM 3878 2908 2327 1939 1454 1163 Profile ≤ 0.1 ≤1 Fz 0.029 0.049 0.061 0.073 0.086 0.096 (59-88) TOOL STEELS ≤ 375 Bhn Feed (mm/min) 675 855 852 849 750 670 |  H A2, D2, H13, L2, M2, or Series 51  P20, S7, T15, W2 ≤ 40 HRc 93 RPM 4928 3696 2957 2464 1848 1478 HSM ≤ 0.05 ≤2 Fz 0.040 0.069 0.086 0.103 0.120 0.134 (74-112) Feed (mm/min) 1183 1530 1526 1523 1331 1189 155 RPM 8240 6180 4944 4120 3090 2472 Profile ≤ 0.1 ≤1 Fz 0.035 0.060 0.075 0.090 0.105 0.117 STAINLESS STEELS (140-171) (FREE MACHINING) ≤ 275 Bhn Feed (mm/min) 1730 2225 2225 2225 1947 1735 303, 416, 420F, or 430F, 440F ≤ 28 HRc 198 RPM 10502 7877 6301 5251 3938 3151 HSM ≤ 0.05 ≤2 Fz 0.048 0.082 0.102 0.122 0.143 0.159 (178-218) Feed (mm/min) 3025 3875 3856 3844 3379 3006 107 RPM 5655 4241 3393 2827 2121 1696 Profile ≤ 0.1 ≤1 Fz 0.029 0.049 0.061 0.073 0.086 0.096 (96-117) STAINLESS STEELS ≤ 275 Bhn Feed (mm/min) 984 1247 1242 1238 1094 977 M (DIFFICULT) or 304, 304L, 316, 316L ≤ 28 HRc 137 RPM 7271 5453 4362 3635 2726 2181 HSM ≤ 0.05 ≤2 Fz 0.040 0.069 0.086 0.103 0.120 0.134 (123-151) Feed (mm/min) 1745 2258 2251 2247 1963 1754 99 RPM 5251 3938 3151 2626 1969 1575 Profile ≤ 0.1 ≤1 Fz 0.029 0.049 0.061 0.073 0.086 0.096 STAINLESS STEELS (89-109) (PH) ≤ 325 Bhn Feed (mm/min) 914 1158 1153 1150 1016 907 13-8 PH, 15-5 PH, or 17-4 PH, Custom 450 ≤ 35 HRc 125 RPM 6624 4968 3975 3312 2484 1987 HSM ≤ 0.05 ≤2 Fz 0.040 0.069 0.086 0.103 0.120 0.134 (112-137) Feed (mm/min) 1590 2057 2051 2047 1789 1598 continued on next page 14 www.kyocera-sgstool.com