Bipolar Permanent Magnetic Stepper Motor Voltage, torque, speed, current, power and output shaft dimension can be customized. ModelStep AngleNo. of Phase Voltage (V)Current (A)Resistance (Ω)Holding Torque (mNm)Rotor Inertia (gcm²)Weight (g) SPB2019-2012182120.15808.30.430 SPB2019-20051844.50.12382.90.430 SPB2821-48127.52120.1339019.42.260 SPB2821-48057.5250.51019.42.260 SPB4216-48127.52120.333658.811.5100 SPB4222-48057.5251.523.353.97.8150 SPB5526-48247.52240.460117.626280