Press / Interference Fit Calculator

Calculate interface pressure, hoop stress, assembly force, and holding torque for cylindrical press fits

Hub

Shaft

Fit Parameters

-
°C

Fits

Clearance
Transition
Interference
Design looks good
Within Limits
58.87
Assembly (Press) Force (kN)
142.54
Hub Hoop Stress (at bore) (MPa)
1471.7
Holding Torque (N·m)
SECTION VIEWSteel 1018HUB OD: 80.00 mmBORE: 50.00 mmSHAFT: 50.05 mmHub Hoop Stress142.5 MPa (39% of 370.0 MPa yield)0%50%75%100%SIDE VIEWL = 40.0 mmFInterferenceδ = 0.0500 mm (50.0 μm)p = 62.46 MPaF = 59 NAA

Design Results

Max Hoop Stress
142.5 MPa
Safety Factor (Hub)
2.60
Safety Factor (Shaft)
5.92

Tolerance Band Impact

IT7 bore (25 μm) + IT6 shaft (19 μm) = ±22.0 μm

MinNominalMax
δ (μm)28.050.072.0
Force (kN)32.9758.8784.77
Torque (N·m)824.21471.72119.2

Temperature Effect

Sensitivity+0.00 μm/°C

Set temperature differential above to see effect on interference

Created by Catlynn Nguyen & Jie Chai · 2026