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Use our Press Fit Interference Calculator to accurately determine interference fits for shafts and holes. Get instant results for pressing force and pressure calculations.
Press fit interference is a crucial aspect of mechanical engineering, ensuring that two components fit together securely through friction without additional fasteners or adhesives. Our Press Fit Interference Calculator helps users quickly and accurately determine the interference fit between a shaft and a hole, making it easy to calculate the required force and pressure. This tool is especially useful for engineers, machinists, and designers who work with press fits in applications like bearings, bushings, gears, and couplings.
Press fit interference, also known as an interference fit or shrink fit, is a type of fastening method where the external part (shaft) has a slightly larger diameter than the internal part (hole). When these components are assembled, the interference creates a strong joint through frictional forces. This method is commonly used in automotive, aerospace, and industrial machinery applications.
To calculate press fit interference, we use the following formula:
Interference (I) = D_hole - D_shaft
Where:
For press fit pressure, the formula is:
P = (I × E) / D
Where:
The force required for pressing the fit is calculated using:
F = π × D × L × P
Where:
| Fit Type | Shaft Diameter (mm) | Interference Fit (mm) | Application |
|---|---|---|---|
| Loose Fit | 10 - 50 | 0.01 - 0.05 | Light duty |
| Medium Fit | 50 - 100 | 0.05 - 0.10 | General use |
| Tight Fit | 100 - 200 | 0.10 - 0.20 | Heavy loads |
The Press Fit Interference Calculator simplifies the process of calculating interference fits, ensuring accurate and efficient designs. Whether you're working with bearings, gears, or bushings, this tool eliminates manual calculations and provides instant results. Use our calculator to determine the correct fit and ensure reliable mechanical connections.
The required interference depends on the material, application, and load conditions. Generally, for light fits, an interference of 0.01 - 0.05 mm is sufficient, while for heavy-duty applications, it can be 0.10 - 0.20 mm.
Use the formula F = π × D × L × P, where you need the shaft diameter, fit length, and pressure to determine the force required.
The basic formula is Interference = Hole Diameter - Shaft Diameter.
In an interference fit, there is no clearance. Instead, the shaft is slightly larger than the hole to create a secure press fit.