103H7123-04G3
The 103H7123-04G3 from Sanyo Denki offers holding torque of 0.83 N·m and weighs 0.65 kg. Part of the StepSyn Stepping Motors, it runs at 3.2 V and has a rotor inertia of 0.21×10⁻⁴ kg·m². It uses a unipolar winding with lead wire and has 15 mH inductance per phase.
With acceleration of 50000 rad·s⁻² and 85 N·cm holding torque, it delivers fast response. It works up to 1000 m altitude. Its winding resistance is 6.7 Ω per phase.