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Internal and external thread dimensions calculator

Internal and external thread dimensions calculator

Calculate simplified basic dimensions for internal and external threads. Results are approximations and do not replace tolerance tables. Inputs, formula and interpretation are separated so you can verify the result before using it for a configurable part.

Calculate

Calculate simplified basic dimensions for internal and external threads
Inputs: Nominal diameter
Inputs: Thread pitch

Schematic illustration – not to scale.

Internal and external thread dimensions calculatorSchematic illustration – not to scale. Nominal diameter, Thread pitch minor diameter approximation ≈ nominal diameter − pitchTPI / p

Schematic illustration – not to scale.

Formula

minor diameter approximation ≈ nominal diameter − pitch

Thread values are calculation aids. Metric and Unified threads are not automatically compatible.

Step by step

  1. Enter the measured or planned values with their units.
  2. Check the formula with substituted values in the result area.
  3. Copy the parameters or open a related product for configuration.

Complete worked example

Worked example with typical workshop values: insert the inputs, apply minor diameter approximation ≈ nominal diameter − pitch and compare the result with the reference table.

23060 mm
14040 mm
32060 mm

Assumptions and limitations

  • Thread values are calculation aids. Metric and Unified threads are not automatically compatible.

Common input mistakes

  • Decimal comma and point are accepted, but do not type units into numeric fields.
  • For gears, the tooth count must be a whole number in practice.

FAQ

Are metric and UNC/UNF threads interchangeable?

No. Similar diameters do not mean profile, pitch and tolerance are compatible.

Can I manufacture directly from this result?

Use the value as a calculation and configuration aid. Loaded or standards-critical parts need engineering review.

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