Steel · ISO P
4340 steel speeds and feeds
Also: 34CrNiMo6, 1.6582, 817M40, G43400
Starting points from the same engines as the calculators, with no tool or setup picked. The first number is where to start; the range is what the manufacturer charts allow. Open a calculator for your tool, machine and cut.
Draft data: researched from manufacturer charts, not yet reviewed by a machinist.
Annealed240 HB
Turning
| Cut | SFM | Feed, IPR | Depth, in |
|---|---|---|---|
| Finishing | 716488–1,009218 m/min | 0.0070.004–0.0100.18 mm/rev | 0.0220.004–0.0400.6 mm |
| Medium | 601410–848183 m/min | 0.0140.007–0.0200.34 mm/rev | 0.0850.012–0.1582.2 mm |
| Roughing | 565385–797172 m/min | 0.0170.010–0.0240.43 mm/rev | 0.1490.060–0.2373.8 mm |
For a CVD carbide insert, general stability, 15 min tool life.
Milling, solid carbide end mill
Speed 250 (150–350) SFM · 76 m/min
| Cutter Ø | IPT | mm/tooth |
|---|---|---|
| 1/8" | 0.00060.0005–0.0006 | 0.014 |
| 1/4" | 0.00160.0015–0.0017 | 0.041 |
| 1/2" | 0.00290.0028–0.0030 | 0.074 |
| 3/4" | 0.00420.0033–0.0050 | 0.105 |
| 1" | 0.00510.0041–0.0060 | 0.128 |
Drilling, Ø1/2" at 3×D
| Drill | SFM | Feed, IPR |
|---|---|---|
| HSS | 7445–115 | 0.01130.0070–0.0150 |
| Cobalt | 9355–115 | 0.01130.0070–0.0150 |
| Solid carbide, through-coolant | 362265–620 | 0.00970.0040–0.0153 |
Feeds scale with drill Ø (0.5" here): the drilling calculator sets them for yours.
Tapping
- Cut tap
- 58 (40–80) SFM
- Form tap
- 20 (10–35) SFM
Quenched & tempered330 HB
Turning
| Cut | SFM | Feed, IPR | Depth, in |
|---|---|---|---|
| Finishing | 521355–734159 m/min | 0.0070.004–0.0100.18 mm/rev | 0.0220.004–0.0400.6 mm |
| Medium | 437298–616133 m/min | 0.0140.007–0.0200.34 mm/rev | 0.0850.012–0.1582.2 mm |
| Roughing | 411280–579125 m/min | 0.0170.010–0.0240.43 mm/rev | 0.1490.060–0.2373.8 mm |
For a CVD carbide insert, general stability, 15 min tool life.
Milling, solid carbide end mill
Speed 182 (109–255) SFM · 55 m/min
| Cutter Ø | IPT | mm/tooth |
|---|---|---|
| 1/8" | 0.00060.0005–0.0006 | 0.014 |
| 1/4" | 0.00160.0015–0.0017 | 0.041 |
| 1/2" | 0.00290.0028–0.0030 | 0.074 |
| 3/4" | 0.00420.0033–0.0050 | 0.105 |
| 1" | 0.00510.0041–0.0060 | 0.128 |
Drilling, Ø1/2" at 3×D
| Drill | SFM | Feed, IPR |
|---|---|---|
| HSS | 3920–43 | 0.00650.0060–0.0070 |
| Cobalt | 3915–99 | 0.00650.0060–0.0070 |
| Solid carbide, through-coolant | 251120–394 | 0.00780.0040–0.0117 |
Feeds scale with drill Ø (0.5" here): the drilling calculator sets them for yours.
Tapping
- Cut tap
- 58 (40–80) SFM
- Form tap
- 20 (10–35) SFM
Hardened 50 HRC50 HRC
Cuts as ISO H (Hardened)
Turning
Hard turning (ISO H, hardened steel) data isn’t sourced yet.
Milling, solid carbide end mill
Hardened steel (ISO H) milling data isn’t sourced yet.
Drilling, Ø1/2" at 3×D
| Drill | SFM | Feed, IPR |
|---|---|---|
| HSS | Hardened steel needs a carbide drill | |
| Cobalt | Hardened steel needs a carbide drill | |
| Solid carbide, through-coolant | 10870–171 | 0.0020 |
Feeds scale with drill Ø (0.5" here): the drilling calculator sets them for yours.
Tapping
No sourced tapping speed for hardened steel yet.
Sources
- Sandvik Coromant — Workpiece materials (MC codes, kc1, mc)
- Mitsubishi Materials USA — Material Cross Reference List
- SAE/ASTM Unified Numbering System (UNS)
- Kennametal — Turning Inserts, Carbide, RP geometry: starting speeds and feeds
- Mitsubishi Materials USA — Optimum Grades and Chip Breakers for External Turning
- Mitsubishi Materials — MC6000 series brochure, recommended cutting conditions
- Harvey Tool — General machining guidelines, carbide end mills (SFM and chip load by diameter)
- 6G Tools — Carbide end mill speeds and feeds, general purpose, uncoated (incl. chip load factor)
- Kennametal — HARVI I TE: 5% radial / 2×D axial dynamic milling, 60% / 1.75×D side milling
- Uddeholm — Impax HiHard machining data: slot milling axial depth ≤ 1 × D
- Sandvik Coromant — Formulas and definitions for milling (net power)
- ISCAR — Machining titanium: average chip thickness hm = fz√(ae/d) at light engagement
- Redline Tools — Cobalt & HSS drills (p. 340) and coolant-fed solid carbide drills (p. 328): speeds and feeds
- Viking Drill & Tool — Recommended speeds and feeds for HSS drills
- Hertel (MSC) — High speed steel & cobalt drills: speeds and feeds
- YG-1 — HSS & cobalt drill parameters, and Carbide Dream Drills technical information
- Dormer Pramet (Precision Twist Drill) — R10/R15/R18 general purpose jobber drills: AMG speeds and feeds
- Redline Tools — Cobalt & HSS drills: speeds and feeds (catalog p. 340)
- Sandvik Coromant — Drilling formulas and definitions (net power)
- Haas Tooling — Cobalt jobber drills; carbide drills, general purpose (plain and TSC) and Inox (TSC): feeds and speeds
- OSG — Carbide drills, lists 215/220D/200/233, and HY-PRO CARB coolant-through drills: drilling technical
- Walter Titex — Technical compendium, holemaking 2024: cutting data for solid carbide drills
- Tru-Edge — Solid carbide drills: feeds and speeds
- YG-1 — Carbide Dream Drills: technical information (speeds, feeds, depth factors)
- OSG — HY-PRO and HY-PRO NRT taps: recommended tapping conditions
- Haas Tooling — Taps and roll taps: speeds and feeds by ISO material group
- Ingersoll — WinTwist exchangeable-head drills: operating guidelines (NEW-393-2, pp. 9–10)