Search Ctrl K
Home / Tools
THE FEUTEX TOOLKIT

Thermal Clearance Assembly

Estimate differential dimensional expansion and final assembly clearance.

Manufacturing workspace● Runs in your browser
01 Your input
02 Your result
View or copy raw result data
FormulaFinal clearance=Dh(1+αhΔTh)−Ds(1+αsΔTs).
Sources and model references

Worked example

Inputs

Initial hole diameter
20 mm
Initial shaft diameter
20.02 mm
Hole material expansion coefficient
1.2e-05 1/K
Shaft material expansion coefficient
1.2e-05 1/K
Hole component temperature change
150 K
Shaft temperature change
0 K

Expected results

Expanded hole diameter
20.036 mm
Expanded shaft diameter
20.02 mm
Final diametral clearance
0.016 mm

Load the example in the workspace to reproduce these results. Display rounding does not change the underlying calculation.

How to use this tool

  1. Enter every input in the labeled units; use measured or independently specified properties.
  2. Check the stated model assumptions before calculating.
  3. Interpret the output as a model estimate and verify it independently for the intended application.

Try this example

{
  "hole": 20,
  "shaft": 20.02,
  "alphaH": 0.000012,
  "alphaS": 0.000012,
  "dtH": 150,
  "dtS": 0
}

Accuracy and scope

Uniform small thermal strain and constant coefficients; no heating method, temperature limit or press-fit safety recommendation. Educational engineering estimate only; not structural or safety certification, equipment selection, or operating recommendations.

Is my data uploaded?

This tool runs locally in your browser. Input and output are not sent to a processing server. Copy or download your result before leaving the page.