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RPM Calculator
Use this tool to calculate RPM (rotations per minute). All dimensions are in decimal inches.
Turning
Turning speeds are optimized for carbide tooling with a feed rate of (0.004/rev.), a depth of cut of 0.040, and a tool life of 180 minutes.
| Material | AISI/SAE/ASTM Designation | Surface Feet/Minute |
| Free machining plain carbon steels (resulfurized) | 1212, 1213, 1215 | 820 - 1045 |
| Free machining plain carbon steels | 1108, 1109, 1115, 1117, 1118, 1120, 1126, 1211 | 950 |
| Free machining plain carbon steels | 1132, 1137, 1139, 1140, 1144, 1146, 1151 | 670 - 800 |
| Free machining plain carbon steels (Leaded) | 11L17, 11L18, 12L13, 12L14 | 800 - 820 |
| Plain carbon steels | 1006, 1008, 1009, 1010, 1012, 1015, 1016, 1017, 1018, 1019, 1020, 1021, 1022, 1023, 1024, 1025, 1026, 1513, 1514 | 800 - 885 |
| Plain carbon steels | 1027, 1030, 1033, 1035, 1036, 1037, 1038, 1039, 1040, 1041, 1042, 1043, 1045, 1046, 1048, 1049, 1050, 1052, 1524, 1526, 1527, 1541 | 670 - 970 |
| Free machining alloy steels (resulfurized): | 4140, 4150 | 430 - 685 |
| Water hardening tool steel | W1, W2, W5 | 590 |
| Cold work, oil hardening tool steel | O1, O2, O6, O7 | 590 |
| Cold work, air hardening tool steel | A2, A3, A4, A6, A7, A8, A9, A10 | 355 - 365 |
| Stainless steels (Austenitic) | 201, 202, 301, 302, 304, 304L, 305, 308, 321, 347, 348 | 570 |
| Cast Iron | ASTM Class 20, 25, 30, 35, 40 | 410 |
| Brass | C35600, C37700, C36000, C33200, C34200, C35300, C48500, C34000 | 1170 |
| Bronze | C65500, C22600, C65100, C67500 | 715 |
| Wrought aluminum | 6061-T6, 5000, 6000, and 7000 series. | 2820 |
| Cast aluminum | Sand and permanent mold casting alloys | 2820 |
Milling
Milling speeds are optimized for high speed steel tooling.
| Material | AISI/SAE/ASTM Designation | Surface Feet/Minute |
| Free machining plain carbon steels (resulfurized) | 1212, 1213, 1215 | 130 - 140 |
| Free machining plain carbon steels | 1108, 1109, 1115, 1117, 1118, 1120, 1126, 1211 | 115 - 130 |
| Free machining plain carbon steels | 1132, 1137, 1139, 1140, 1144, 1146, 1151 | 35 - 70 |
| Free machining plain carbon steels (Leaded) | 11L17, 11L18, 12L13, 12L14 | 110 - 140 |
| Plain carbon steels | 1006, 1008, 1009, 1010, 1012, 1015, 1016, 1017, 1018, 1019, 1020, 1021, 1022, 1023, 1024, 1025, 1026, 1513, 1514 | 65 - 110 |
| Plain carbon steels | 1027, 1030, 1033, 1035, 1036, 1037, 1038, 1039, 1040, 1041, 1042, 1043, 1045, 1046, 1048, 1049, 1050, 1052, 1524, 1526, 1527, 1541 | 25 - 100 |
| Free machining alloy steels (resulfurized) | 4140, 4150 | 35 - 100 |
| Water hardening tool steel | W1, W2, W5 | 85 |
| Cold work, oil hardening tool steel | O1, O2, O6, O7 | 50 |
| Cold work, air hardening tool steel | A2, A3, A4, A6, A7, A8, A9, A10 | 40 - 50 |
| Stainless steels (Austenitic) | 201, 202, 301, 302, 304, 304L, 305, 308, 321, 347, 348 | 70 - 75 |
| Cast Iron | ASTM Class 20, 25, 30, 35, 40 | 70 - 100 |
| Brass | C33200, C34000, C34200, C35300, C35600, C36000, C37700, C48500 | 100 - 200 |
| Bronze | C22600, C65100, C65500, C67500 | 30 - 80 |
| Wrought aluminum | 6061-T6, 5000, 6000, and 7000 series. | 165 |
| Cast aluminum | Sand and permanent mold casting alloys | 165 |
Drilling & Reaming
Drilling and reaming speeds are optimized for high speed steel tooling.
| Material | AISI/SAE/ASTM Designation | Drilling Surface Feet/Minute | Reaming Surface Feet/Minute |
| Free machining plain carbon steels (resulfurized) | 1212, 1213, 1215 | 120 - 125 | 80 |
| Free machining plain carbon steels | 1108, 1109, 1115, 1117, 1118, 1120, 1126, 1211 | 100 - 120 | 75 - 80 |
| Free machining plain carbon steels | 1132, 1137, 1139, 1140, 1144, 1146, 1151 | 35 - 70 | 20 - 45 |
| Free machining plain carbon steels (Leaded) | 11L17, 11L18, 12L13, 12L14 | 90 - 130 | 60 - 85 |
| Plain carbon steels | 1006, 1008, 1009, 1010, 1012, 1015, 1016, 1017, 1018, 1019, 1020, 1021, 1022, 1023, 1024, 1025, 1026, 1513, 1514 | 60 - 100 | 40 - 65 |
| Plain carbon steels | 1027, 1030, 1033, 1035, 1036, 1037, 1038, 1039, 1040, 1041, 1042, 1043, 1045, 1046, 1048, 1049, 1050, 1052, 1524, 1526, 1527, 1541 | 25 - 90 | 15 - 60 |
| Free machining alloy steels (resulfurized) | 4140, 4150 | 30 - 90 | 15 - 60 |
| Water hardening tool steel | W1, W2, W5 | 85 | 55 |
| Cold work, oil hardening tool steel | O1, O2, O6, O7 | 45 | 30 |
| Cold work, air hardening tool steel | A2, A3, A4, A6, A7, A8, A9, A10 | 30 - 50 | 20 - 35 |
| Stainless steels (Austenitic) | 201, 202, 301, 302, 304, 304L, 305, 308, 321, 347, 348 | 50 - 55 | 30 - 35 |
| Cast Iron | ASTM Class 20, 25, 30, 35, 40 | 80 - 100 | 50 - 65 |
| Brass | C35600, C37700, C36000, C33200, C34200, C35300, C48500, C34000 | 160 - 175 | 160 - 175 |
| Bronze | C65500, C22600, C65100, C67500 | 120 - 140 | 110 - 120 |
| Wrought aluminum | 6061-T6, 5000, 6000, and 7000 series. | 350 - 400 | 350 - 400 |
| Cast aluminum | Sand and permanent mold casting alloys | 350 - 400 | 350 - 400 |