Interference Fit Press Force
Estimate the maximum press force F from interface pressure p, diameter d, engaged length l and press-fit friction μ.
Inputs
Formula
Fundamentals
Estimate the maximum press force F from interface pressure p, diameter d, engaged length l and press-fit friction μ.
This tool computes Interference Fit Press Force from the formula: F = p·π·d·l·μ
History
Design theory of gears, threads and bearings matured with machine tools and standardisation (AGMA, ISO) since the Industrial Revolution.
Engineering applications
Used for transmission design, joint strength checks and component selection.
Glossary
| Interface pressure p | Input parameter |
| Fit diameter d | Input parameter |
| Engaged length l | Input parameter |
| Press force F | Output result |
How to use
- Fill in Interface pressure p, Fit diameter d, Engaged length l, Press friction μ in the Inputs section (watch the unit on each field).
- Click Calculate; the tool evaluates the formula shown above.
- Read Press force F in the results area.
Formula · Worked Example · Knowledge
Formula
核心计算关系：F = p·π·d·l·μ
输入变量：
- Interface pressure p
p— MPa - Fit diameter d
d— mm - Engaged length l
l— mm - Press friction μ
mu
输出结果：
- Press force F
F— N
假设/适用：Gearing/thread formulas assume standard, zero-backlash mounting; include error & load factors K_A.
Worked Example
根据公式 F = p·π·d·l·μ，取 Interface pressure p = 50 MPa；Fit diameter d = 50 mm；Engaged length l = 40 mm；Press friction μ = 0.12。
代入计算得：Press force F = 37,700 N。
Key Points
- Gearing/thread formulas assume standard, zero-backlash mounting; include error & load factors K_A.
- Compare stress with allowable stress and keep a safety factor (≥1.5, ≥2 for critical parts).
- For high speed/load also check lubrication, heat and fatigue life, not just static strength.
Parameters
Inputs
| Parameter | Symbol | Unit | Default |
|---|---|---|---|
| Interface pressure p (MPa) | p | MPa | 50 |
| Fit diameter d (mm) | d | mm | 50 |
| Engaged length l (mm) | l | mm | 40 |
| Press friction μ | mu | 0.12 |
Outputs
| Result | Symbol | Unit |
|---|---|---|
| Press force F | F | N |
Applications
- Common engineering use cases