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I have calculated the applied torque to be

**70,000 ft-lbs (95 kNm**). I would like to determine the size of HSS required if I use both 319 Stainless (

**Fv = 103 MPa**) and 350W Mild Steel (

**Fv = 210 MPA**) [Fv = allowable shear stress]. I will be comparing both materials as both offer advantages.

Is there a way to use the Torsional Constant [J] to determine allowable torque on a section? I have been able to calculate the required capacity for solid round, hollow round, and solid square sections. The method to determine the allowable torque on a hollow square shaft eludes me! It is my hypothesis that a 10x10x1/2" S.S. HSS will suffuce however I am not certain.

Any advise or direction would be greatly appreciated!