Cylindrical Press-Fit Interference

Cylindrical Press-Fit Interference

This tool calculates the stresses, interface pressure, axial force, and torque capacity for an interference fit between two cylinders (e.g., a shaft pressed into a hub). Enter the material properties and dimensions, then click Calculate.

Input Parameters
Shaft OD (mm): Hub ID (mm):
Shaft ID (mm): Hub OD (mm):
Shaft L (mm): Hub L (mm):
Shaft E (GPa): Hub E (GPa):
Shaft v (-): Hub v (-):
Shaft σy (MPa): Hub σy (MPa):
μ (-):
Output Results
F (kN): T (Nm):
Shaft σmax (MPa): Hub σmax (MPa):
Shaft YSF (-): Hub YSF (-):

Cross-Sectional View of Cylinders

Radial Stress Distribution

Hoop Stress Distribution

Equivalent (Von Mises) Stress Distribution

Diagnostics will appear here…

Explanation of Terms

  • Inner Cylinder: Typically the shaft or inner part being pressed in.
  • Outer Cylinder: Typically the hub or outer part receiving the press fit.
  • Hoop Stress (σθ): Tangential stress around the circumference, like tension in a ring.
  • Radial Stress (σr): Stress directed toward or away from the center.
  • Equivalent Stress (σeq): Von Mises stress, used to predict yielding for safe design; combines hoop and radial stresses.
  • Interface Pressure (P): The compressive pressure at the contact surface due to the interference.
  • Axial Force (F): Maximum pull-out force resisted by friction.
  • Torque (T): Maximum rotational torque resisted by friction.
  • Graphs: Show stress variation from inner radius to outer radius. Blue line: inner cylinder; Red line: outer cylinder; Dashed line: interface. Note: Radial stress is continuous at the interface, but hoop and equivalent stresses typically show a discontinuity due to the different components.

Hover over input/output labels for more details. Ensure stresses are below material yield strength for safe design for elastic behavior.