Estimate basic thread dimensions from a nominal diameter and pitch.
Thread Calculator
Form
Results
Basic pitch diameter
0
Basic minor diameter
0
Table of Contents
1
What is Thread Calculator?
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How to Use This Calculator
- Enter or select Calculate..., Thread pitch, Basic major diameter.
- Check the unit beside each measurement. For a percentage or rate, use the scale and time period stated in the form.
- Choose Calculate, then compare the output with the formula and example below. If you change a value or option, calculate again to update the result.
3
Formula Used
Pitch diameter = major diameter−0.64952 × pitch; minor diameter subtracts 1.22687 × pitch externally or 1.08253 × pitch internally, with lengths in mm.
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Variables Explained
| Input | What it means |
|---|---|
| Calculate... | Use the measured or stated value for this item, with the unit or category shown beside the field. |
| Thread pitch | Use the measured or stated value for this item, with the unit or category shown beside the field. |
| Basic major diameter | Distance across a circle through its center; twice the radius. |
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Worked Example
For an external M10 × 1.5 basic thread, pitch diameter is about 9.02572 mm and modeled minor diameter is about 8.15970 mm.
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Why Use This Calculator?
Use the result to put measurements on a common basis before comparing them or estimating quantities. The original measurement precision still limits the precision of the answer.
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Common Mistakes
- Thread form, tolerance class and number of starts affect the dimensions; nominal diameter alone is insufficient.
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Frequently Asked Questions
When should I round a measurement?
Carry the measured values and conversion factors through the calculation first. Round the final result to a precision justified by the original measurements.
Why can a supplier’s quantity differ?
Measurement conventions, nominal sizes, density assumptions and purchase rounding can change a practical quantity. Compare the units and assumptions before comparing the numbers.
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Sources & References
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