Spek: No. of Phases 2 Configuration 4 Wire (Bipolar) Step Angle ( 5%) 1.8 /Step Rated Voltage 6.3 V Rated Current 3A / Phase Resistance (10%) 2.1 Inductance (20%) 9 mH/Phase Torque (Max) Front Shaft Dia 8 mm Frame Size NEMA23 (57 mm) Motor Length 115 mm Ambient Temp. Range -20 C - +50 C