Press Fit Interference Calculator
This tool helps you determine the interference fit between a hole and a shaft. The interference fit is crucial for ensuring proper assembly and tightness in mechanical components.
Press Fit Interference Calculator
Enter the diameters of the hole and shaft to calculate the interference.
Press Fit Illustration
How It Works
Input Diameters
- Enter the diameter of the hole.
- Enter the diameter of the shaft.
Calculate Interference
The calculator computes the interference, which is the difference between the shaft diameter and the hole diameter.
Interpret Results
- Positive Ξ: Interference fit (shaft larger than hole)
- Zero Ξ: Exact fit
- Negative Ξ: Clearance fit (shaft smaller than hole)
Press Fit Formula
Where:
- Ξ (Interference) = The amount by which the shaft is larger than the hole, resulting in a press fit
- Dhole = Diameter of the hole
- Dshaft = Diameter of the shaft
Example Calculation
If the diameter of the hole is 50 mm and the diameter of the shaft is 51 mm:
Using the formula: Ξ = Dshaft β Dhole
Interference = 51 β 50 = 1 mm
This means the shaft will have a 1 mm interference fit with the hole, ensuring a snug fit.
Instructions
Enter the measurements in the fields provided.
Click "Calculate" to see the interference value.
Use "Reset" to clear the inputs and results.
This calculator is ideal for engineers and technicians who need to assess the fit between mechanical parts for precision assembly.
Types of Fits
Interference Fit
Shaft diameter > Hole diameter. The shaft must be pressed or shrink-fitted into the hole. Provides maximum grip and torque transmission.
Transition Fit
Shaft diameter β Hole diameter. May result in either slight interference or clearance. Used when accurate location is required.
Clearance Fit
Shaft diameter < Hole diameter. The shaft can slide or rotate freely within the hole. Used for moving parts.
Need Help With Press Fit Applications?
JBM engineers can assist with interference fit calculations and help you select the optimal self-lubricating bearing for your press fit applications.
Contact an Engineer