Interference Fit Calculator

Calculate interface pressure, stresses, and assembly force for press fits between shaft and hub using thick cylinder theory.

Nominal shaft diameter at the interface.
mm
Total diametral interference (shaft OD minus hole ID).
mm
Outside diameter of the hub/housing.
mm
Inside diameter if hollow shaft. 0 for solid.
mm
Same material for both parts. Steel: 207 GPa.
GPa
Axial length of the press fit.
mm
Coefficient of friction. Steel/steel: 0.12-0.15.

Results

Interface Pressure-MPa
Assembly/Removal Force-kN
Torque Capacity-N·m
Hub Hoop Stress-MPa
References: Shigley's — Press and Shrink Fits; ISO 286