Bipolar Stepper motor ( 1 Nm to 22 Nm Torque ) High Torque density High Power Rare earth Magnets Rugged Design and long life Bearing 4 Lead / 8 Lead , Series / Parallel , Hybrid Stepper motors Frame Size :: 28 mm to 110 mm Capacity :: 10 Kgcm to 220 Kgcm Current :: 1A to 6A RPM :: Load Dependent Can go max upto 500 rpm