Step Angle : 1.8 ° Holding Torque : 18.9 kg-cm Operating Voltage : 3.2 Volts Supply Current (A) : 2.8 A/Phase No. of Leads :  4 Inductance: 3.6 mH/Phase Resistance : 1.13 O/Phase Rotor Inertia : 480 gm-cm2 Inductance Accuracy :  ±20% Resistance Accuracy : ±10% Shaft Diameter (mm) : 6.35 Shaft Length (mm) : 20.6 Cable Length: 30 CM Comparably more powerful than NEMA17 motors. Input pulse decides the rotation angle of the motor. High accuracy of around 3 to 5% a step. Provides good starting, stopping and reversing. Control of this motor is less costly because of exclusion of complex control circuitry. The speed is proportional to the frequency of the input pulses.