Machining calculators
Speeds and feeds for turning, milling and drilling, plus tap drill sizes. Results update as you type.
Thread chart
For pipe and Whitworth threads and minor diameters, print our full tapping drill sizes chart (A3 PDF).
Metric coarse
| Thread | Pitch | Tap drill |
|---|---|---|
| M1.6 × 0.35 | 0.35 mm | 1.25 mm |
| M2 × 0.4 | 0.4 mm | 1.6 mm |
| M2.5 × 0.45 | 0.45 mm | 2.05 mm |
| M3 × 0.5 | 0.5 mm | 2.5 mm |
| M4 × 0.7 | 0.7 mm | 3.3 mm |
| M5 × 0.8 | 0.8 mm | 4.2 mm |
| M6 × 1 | 1 mm | 5 mm |
| M8 × 1.25 | 1.25 mm | 6.75 mm |
| M10 × 1.5 | 1.5 mm | 8.5 mm |
| M12 × 1.75 | 1.75 mm | 10.25 mm |
| M14 × 2 | 2 mm | 12 mm |
| M16 × 2 | 2 mm | 14 mm |
| M18 × 2.5 | 2.5 mm | 15.5 mm |
| M20 × 2.5 | 2.5 mm | 17.5 mm |
| M22 × 2.5 | 2.5 mm | 19.5 mm |
| M24 × 3 | 3 mm | 21 mm |
| M27 × 3 | 3 mm | 24 mm |
| M30 × 3.5 | 3.5 mm | 26.5 mm |
| M33 × 3.5 | 3.5 mm | 29.5 mm |
| M36 × 4 | 4 mm | 32 mm |
| M42 × 4.5 | 4.5 mm | 37.5 mm |
| M48 × 5 | 5 mm | 43 mm |
Metric fine
| Thread | Pitch | Tap drill |
|---|---|---|
| M8 × 1 | 1 mm | 7 mm |
| M10 × 1 | 1 mm | 9 mm |
| M10 × 1.25 | 1.25 mm | 8.75 mm |
| M12 × 1.25 | 1.25 mm | 10.75 mm |
| M12 × 1.5 | 1.5 mm | 10.5 mm |
| M14 × 1.5 | 1.5 mm | 12.5 mm |
| M16 × 1.5 | 1.5 mm | 14.5 mm |
| M18 × 1.5 | 1.5 mm | 16.5 mm |
| M20 × 1.5 | 1.5 mm | 18.5 mm |
| M22 × 1.5 | 1.5 mm | 20.5 mm |
| M24 × 2 | 2 mm | 22 mm |
UNC
| Thread | Pitch | Tap drill |
|---|---|---|
| #4-40 | 40 TPI | #43 (2.26 mm) |
| #6-32 | 32 TPI | #36 (2.71 mm) |
| #8-32 | 32 TPI | #29 (3.45 mm) |
| #10-24 | 24 TPI | #25 (3.8 mm) |
| 1/4-20 | 20 TPI | #7 (5.11 mm) |
| 5/16-18 | 18 TPI | F (6.53 mm) |
| 3/8-16 | 16 TPI | 5/16 (7.94 mm) |
| 7/16-14 | 14 TPI | U (9.35 mm) |
| 1/2-13 | 13 TPI | 27/64 (10.72 mm) |
| 9/16-12 | 12 TPI | 31/64 (12.3 mm) |
| 5/8-11 | 11 TPI | 17/32 (13.49 mm) |
| 3/4-10 | 10 TPI | 21/32 (16.67 mm) |
| 7/8-9 | 9 TPI | 49/64 (19.45 mm) |
| 1-8 | 8 TPI | 7/8 (22.23 mm) |
UNF
| Thread | Pitch | Tap drill |
|---|---|---|
| #10-32 | 32 TPI | #21 (4.04 mm) |
| 1/4-28 | 28 TPI | #3 (5.41 mm) |
| 5/16-24 | 24 TPI | I (6.91 mm) |
| 3/8-24 | 24 TPI | Q (8.43 mm) |
| 7/16-20 | 20 TPI | 25/64 (9.92 mm) |
| 1/2-20 | 20 TPI | 29/64 (11.51 mm) |
| 9/16-18 | 18 TPI | 33/64 (13.1 mm) |
| 5/8-18 | 18 TPI | 37/64 (14.68 mm) |
| 3/4-16 | 16 TPI | 11/16 (17.46 mm) |
| 7/8-14 | 14 TPI | 13/16 (20.64 mm) |
| 1-12 | 12 TPI | 59/64 (23.42 mm) |
Starting cutting speeds for carbide
Conservative starting points by ISO material group. Check the tool maker’s catalogue for your exact grade, and adjust for your machine and setup.
| Group | Material | Turning Vc | Milling Vc |
|---|---|---|---|
| P | Steel | 150–300 m/min | 120–250 m/min |
| M | Stainless steel | 100–200 m/min | 80–180 m/min |
| K | Cast iron | 150–300 m/min | 120–250 m/min |
| N | Aluminium and non-ferrous | 300–1000 m/min | 300–1000 m/min |
| S | Heat-resistant alloys and titanium | 30–80 m/min | 25–70 m/min |
| H | Hardened steel | 50–150 m/min | 50–120 m/min |
Printable versions: drilling speeds and feeds and milling speeds and feeds (A3 PDFs). More on the wall charts page.
Need help choosing the tool itself? Try the Tool Finder or ask us.
A guide only. These tools and figures are general starting points, not a guarantee for your job. Results depend on your machine, setup, material and tooling, so always check against the tool maker’s data, and talk to a Teravin sales engineer to make sure it’s right for your application. Call +61 8 9345 2099 or ask us. See our terms of use.
