Engineering lab · Interactive tool
Thermal Fit + Clearance Calculator.
Track how independent temperatures and material expansion rates shift the diametral relationship between a shaft and bore.
Thermal fit screening / independent component temperatures
Live calculationUniform linear expansion
ΔD = D · α · ΔTTemperature can reverse a nominal fit
This first-order model applies uniform linear expansion to the bore and shaft independently, making it useful for quick assembly, operating-temperature, or material-pair screening.
For critical fits, apply the full manufacturing tolerance limits and evaluate contact pressure, gradients, transient states, coatings, and constrained deformation.
Before releasing a thermal fit
- Evaluate hot, cold, startup, shutdown, and assembly states
- Use temperature-dependent material properties where needed
- Include full shaft and bore tolerance limits
- Check interference pressure and material yield
- Account for gradients, constraint, coatings, wear, and surface finish
Direct senior involvement
Turn the product decision into a clear next step.
Share a non-confidential summary, the current stage, and the outcome the team needs.
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