THE NUMBERS, EXPLAINED
How to use this calculator.
Aligned rows test proposed tube pairs; radial clearance is half the difference between outer bore and inner tube outside diameter. Manufacturing tolerance must be included in supplied dimensions.
Start with your inputs
Enter inner tube outside diameters (mm), outer tube outside diameters (mm), outer tube wall thicknesses (mm), required radial clearance (mm). Keep amounts in the units shown on each field. The example is a starting point, not a recommended value.
| Input | Example value |
|---|---|
| Inner tube outside diameters (mm) | 5,8 |
| Outer tube outside diameters (mm) | 8,12 |
| Outer tube wall thicknesses (mm) | 1,1 |
| Required radial clearance (mm) | 0.5 |
A worked example
With the example inputs above, available radial clearances (mm) is 0.5, 1. Change the inputs to explore your own scenario.
| Result | Example answer |
|---|---|
| Available radial clearances (mm) | 0.5, 1 |
| Compatible pair row numbers | 1, 2 |
How this is calculated
Available radial clearances (mm)
Subtract inner-tube diameter from outer-tube bore and divide by two.
Compatible pair row numbers
Keep pairs whose radial clearance meets the entered minimum.
Symbols and units
- a
- Inner tube outside diameters (mm)
- b
- Outer tube outside diameters (mm)
- c
- Outer tube wall thicknesses (mm)
- d
- Required radial clearance (mm)
Use the units shown. A list keeps the order in which you enter its values. The symbol ^ means “raised to the power of”.
Assumptions and limits
Aligned rows test proposed tube pairs; radial clearance is half the difference between outer bore and inner tube outside diameter. Manufacturing tolerance must be included in supplied dimensions.
Calculations use the values you enter. Blank or invalid inputs show an error instead of silently substituting zero. Results are displayed to useful precision; calculations retain the underlying numeric precision.
Questions about this tool
What does the result tell me?
Available radial clearances (mm); Compatible pair row numbers. The result applies to the method and inputs described above. Check the units and assumptions before using it in a decision.
Why might another calculator differ?
Differences in units, rounding, timing or model definitions can produce different answers. Compare the input definitions and the method, rather than only the final number. For this tool: Aligned rows test proposed tube pairs; radial clearance is half the difference between outer bore and inner tube outside diameter. Manufacturing tolerance must be included in supplied dimensions.
Are my inputs stored or sent to AI?
Calculations on this page happen in your browser. The separate AI question finder sends its submitted conversation to OpenAI; these calculator fields are not sent. Favourites and recent tool names are stored locally. A shared link contains the inputs you choose to include.
Further reading
OpenStax Prealgebra 2e — arithmetic and proportions ↗
Background reading; this does not imply endorsement or independent review of SumFizz.
Review status
Software example and browser checks are recorded in our quality report. No external expert review is claimed. Created with coding assistance; calculations run as ordinary browser code.
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