Press Fit / Interference Fit Calculator.
Calculate contact pressure, push-out force, hub stress, required interference, and shrink-fit temperature for shaft-hub press fits and shrink-fit assemblies. Based on Lamé's thick-cylinder equations.
Geometry
mm — nominal mating diameter
mm — 0 if solid
mm
mm — contact length
mm — typical: 0.0005·D to 0.001·D for press fit
Materials
Steel-steel ≈ 0.10–0.15; oiled = lower
CONTACT PRESSURE
—
MPa (N/mm²)
PUSH-OUT / TRANSMISSIBLE FORCE
—
kN axial
Transmissible torque
—
Hub max stress (σθ)
—
Shaft max stress
—
Press-in force
—
Shrink-fit ΔT (hub heat)
—
Required clearance
—
p = δ / [Df · (Chub/Eh + Cshaft/Es)]
Chub = (Do² + Df²)/(Do² − Df²) + νh
Cshaft = (Df² + Di²)/(Df² − Di²) − νs
Faxial = π · Df · L · p · μ
Chub = (Do² + Df²)/(Do² − Df²) + νh
Cshaft = (Df² + Di²)/(Df² − Di²) − νs
Faxial = π · Df · L · p · μ