For a solid round shaft, the maximum shear stress \(\tau_{\text{round}}\) is given by:
\[
\tau_{\text{round}} = \frac{T \cdot r}{J_{\text{round}}}
\]
where \(J_{\text{round}} = \frac{\pi r^4}{2}\) is the polar moment of inertia for a round shaft.
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