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Metric to UNC/UNF thread comparison

Metric to UNC/UNF thread comparison

Compare metric threads with nearby UNC and UNF sizes by diameter and pitch. The table shows deviations, not interchangeability. Inputs, formula and interpretation are separated so you can verify the result before using it for a configurable part.

Calculate

Compare metric threads with nearby UNC and UNF sizes by diameter and pitch
Inputs: Nominal diameter
Inputs: Thread pitch

Schematic illustration – not to scale.

Metric to UNC/UNF thread comparisonSchematic illustration – not to scale. Nominal diameter, Thread pitch geometric comparison by diameter and pitchTPI / p

Schematic illustration – not to scale.

Formula

geometric comparison by diameter and 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 geometric comparison by diameter and 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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