Twisting moment or Maximum torque is the measure of force used to rotate an object. The performance of the circular shaft is calculated by quoting the maximum power, the engine rotation speeds and torque. The maximum torque of the circular shaft helps in calculating the maximum speed of it. Use this online calculator to find the Maximum Torque of circular torque by entering the Maximum Shear Stress, Polar Moment of Inertia and Radius of Shaft.