Press Fit Interference Calculator: The Gold Standard for Permanent Joints
Used by mechanical engineers worldwide, our press fit interference calculator ensures reliable, high-strength assemblies — from aerospace to automotive.
"Coniunctio firma" — A firm joint.
How the Press Fit Interference Calculator Works
Core equations:
δ = D_shaft - D_hole
p = (δ / d) × (E1×E2)/(E1+E2) × (1+ν)/(1-ν²)
F = μ × π × d × L × p
p = (δ / d) × (E1×E2)/(E1+E2) × (1+ν)/(1-ν²)
F = μ × π × d × L × p
Press Fit Interference Calculator: Four Essential Modes
Basic Press Fit Mode
Direct interference and fit classification in our press fit interference calculator.
Insertion Force Mode
Calculate required press tonnage.
Stress Analysis Mode
Hoop and radial stress verification.
Tolerance Fit Mode
ISO 286 standard tolerance bands.
Press Fit Interference Calculator: ISO 286 Tolerance Table
| Fit Type | Interference (μm) | Application |
|---|---|---|
| H7/p6 | 16–35 | Heavy Press |
| H7/n6 | 10–25 | Medium Press |
| H7/m6 | 6–16 | Light Press |
Press Fit Interference Calculator: Material Properties
- Steel: E = 210 GPa, ν = 0.30, μ = 0.12
- Aluminum: E = 70 GPa, ν = 0.33, μ = 0.15
- Brass: E = 110 GPa, ν = 0.35, μ = 0.14
- Max interference: 0.001 × diameter (rule of thumb)
Pro Tips for the Press Fit Interference Calculator
- Use chamfers 15° × 0.5 mm
- Apply lubricant reduces force 30%
- Temperature: +100°C increases interference 0.0012 × d
- Verify with FEA for critical joints
- Ultrasonic press for precision
Build Joints That Last
From gears to bearings, our press fit interference calculator ensures zero failure.
Calculate Fit