How It Works - Shaft Design Theory
+Shaft Sizing Calculator
Calculate minimum shaft diameter for combined bending moment and torque using ASME/von Mises criteria.
Applied Loads
N-m
N-m
N (tension positive)
ASME Shock/Fatigue Factors
Material Properties
For keyway, shoulder, etc. (1.0 = no concentration)
✓
Design Calculated
Minimum diameter determined
Shaft Sizing Results
Minimum Diameter
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Recommended Standard Size
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Equivalent Stress
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Allowable Stress
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Bending Stress (at d_min)
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Shear Stress (at d_min)
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Enter loads to calculate minimum shaft diameter.
Verification at Standard Diameter
Bending Stress
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Shear Stress
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Equivalent Stress
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Actual Safety Factor
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ASME Shock Factors
| Load Type | Km | Kt |
|---|---|---|
| Stationary, steady | 1.0 | 1.0 |
| Rotating, gradually applied | 1.5 | 1.0 |
| Rotating, minor shock | 1.5-2.0 | 1.0-1.5 |
| Rotating, heavy shock | 2.0-3.0 | 1.5-3.0 |
Standard Shaft Sizes (mm)
Preferred: 10, 12, 14, 16, 18, 20, 22, 25, 28, 30, 32, 35, 38, 40, 45, 50, 55, 60, 65, 70, 75, 80, 90, 100
Inch: 0.5", 0.625", 0.75", 0.875", 1.0", 1.125", 1.25", 1.5", 1.75", 2.0"