How It Works - Interference Fit Theory
+Press Fit Calculator
Calculate contact pressure, stresses, assembly force, and torque capacity for interference fits.
Geometry
mm - Interface diameter
mm - Hub outer diameter
mm - 0 for solid shaft
mm
mm - shaft_OD - hub_ID
Steel/steel: 0.10-0.15
Material Properties
✓
Safe Design
Stresses within yield limits
Press Fit Results
Contact Pressure
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Hub Hoop Stress (max)
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Shaft Stress (max)
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Assembly Force
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Holding Torque Capacity
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Hub Safety Factor
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Shaft Safety Factor
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Enter dimensions and interference to calculate fit parameters.
Shrink Fit Temperature
Hub Heating Required
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Shaft Cooling Required
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Based on alpha = 12e-6/C for steel. Add 20-50C clearance margin.
ISO Fit Reference
| Fit Type | Hole | Shaft | Interference/d |
|---|---|---|---|
| Light Press | H7 | p6 | 0.0003-0.0010 |
| Medium Press | H7 | s6 | 0.0006-0.0015 |
| Heavy Press | H7 | u6 | 0.0010-0.0025 |
| Force Fit | H7 | x6 | 0.0015-0.0030 |
Friction Coefficients
| Condition | mu |
|---|---|
| Steel/Steel, dry | 0.12-0.15 |
| Steel/Steel, oiled | 0.08-0.10 |
| Steel/Cast Iron | 0.10-0.12 |
| Steel/Bronze | 0.08-0.10 |
| Shrink fit (oxidized) | 0.15-0.20 |