Feed Rate Calculator for Threading
Optimize your machining processes with our online cutting parameters calculator. Select the operation type (turning, milling, drilling or threading) and instantly get the critical calculations for your shop: cutting speed (Vc), revolutions per minute (RPM), feed per revolution or per tooth, machining time and the theoretical roughness (Ra / Rz) based on the insert nose radius. To fine-tune those values live at the machine, use the interactive machining calculator.
Cutting calculator
Which operation are you machining?
What do you want to calculate?
Introduce RPM y paso
Formula
Result
F en mm/min
0mm/min
F por vuelta / lead: F1
In G84 some controls expect F in mm/min; in lathe G76/G32/G92, F is normally the pitch/lead in mm/rev.
Material, power and warnings
Pick material and tool: that gives you the Vc and feed ranges, and also whether your machine can take the cut.
Do you want to adjust these values live?
Here you get the recommendation (Vc, feed, roughness, threading). In the interactive machining calculator you can move Vc, diameter, RPM and feed with linked scales, locks and time/power estimation.
Open interactive calculator →Feed rate in threading: formula, example and table
F = P × n
In threading the feed is not chosen: it is the pitch P per revolution, synchronised with the spindle (G84, G76, G32). Only the speed n is chosen.
Worked example: M12 x 1.75 in Medium-carbon steel C45 / 1045 at Vc 95 m/min → n = 2520 rpm and F = 1.75 × 2520 = 4410 mm/min.
With rigid tapping (G84 with synchronised spindle) the control already programs F = P × n; without it, use a floating tap holder to absorb the difference. On large pitches or hard materials split the thread into several passes or use a thread mill, which avoids the problem.
| Thread | Pitch (mm) | n (rpm) | F (mm/min) |
|---|---|---|---|
| M6 x 1 | 1 | 5040 | 5040 |
| M8 x 1.25 | 1.25 | 3780 | 4725 |
| M10 x 1.5 | 1.5 | 3024 | 4536 |
| M12 x 1.75 | 1.75 | 2520 | 4410 |
| M16 x 2 | 2 | 1890 | 3780 |
| M20 x 2.5 | 2.5 | 1512 | 3780 |
| M24 x 3 | 3 | 1260 | 3780 |
Related tools
RPM, feeds and machining time calculator
Calculate cutting speed, RPM, feeds and pass time for milling, turning and drilling. Adjust values with linked scales and look up starting values by material.
Calculate cycle time
Estimate CNC turning and milling cycle time from G-code. Calculate parts per hour with a breakdown of cutting, rapids, canned cycles and tool changes.
Machining quote
Instant machining quote: material, machine time, setup per batch, secondary operations and margin. Free, no sign-up.