About The Press Fit Interference Calculator

The Press Fit Interference Calculator estimates diametral interference and approximate contact pressure for a simplified shaft and hub press fit.

How to Use the Press Fit Interference Calculator Online

1. Enter shaft diameter and hole diameter.
2. Enter shaft and hub elastic modulus values in GPa.
3. Run the calculator to review interference and estimated contact pressure.

Choosing Options Correctly

The shaft diameter must exceed the hole diameter. Real press-fit design also depends on hub geometry, wall thickness, Poisson's ratio, surface finish, temperature, material yield, lubrication, and assembly method.

Common Use Cases

• Screen a shaft-hub interference value.
• Compare material modulus assumptions.
• Estimate whether interference is in a plausible pressure range.

Quick FAQ

Does this calculate press force?
No. It estimates pressure or stress behavior from interference assumptions. Press force also depends on friction, lead-in, surface finish, and assembly method.

Can clearance fits be entered?
A negative or zero interference represents a loose or transition condition, not a press fit with contact pressure.

Does it include thermal expansion?
Only if you include temperature effects yourself. Heated hubs, chilled shafts, and mixed materials should be checked separately.

Can I use the result for final fit design?
Use it as a screening estimate, then verify ISO fits, material yield, surface finish, tolerances, assembly process, and operating temperature.