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
Schematic illustration – not to scale.
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
- Enter the measured or planned values with their units.
- Check the formula with substituted values in the result area.
- 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.
| 2 | 30 | 60 mm |
| 1 | 40 | 40 mm |
| 3 | 20 | 60 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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