Calculate the required diameter for a power transmission shaft based on torque or power and RPM.
Input Parameters
kW
RPM
MPa
Required Diameter
Enter parameters to calculate diameter
Quick Reference
dShaft Diameter
TTorque (transmitted)
τAllowable Shear Stress
PPower in Watts
Overview
A shaft is a rotating machine element which is used to transmit power from one place to another. The power is delivered by applying torque. This calculator helps determine the minimum shaft diameter required to withstand the torsional stress.
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Pro Tips
The allowable shear stress depends on the shaft material (e.g., 40-50 MPa for mild steel).
Factor of Safety (FoS) should be applied to the allowable stress for critical applications.
The formula assumes the shaft is subjected to pure torsion without bending moments.
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Fun Facts
"The drive shaft in a car can spin at over 3,000 RPM while transmitting hundreds of horsepower."
"Hollow shafts are more efficient than solid shafts in terms of strength-to-weight ratio."
"The longest shaft in the world is likely in a deep-sea drilling rig or a massive cargo ship."
