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This high precision NEMA 17 Stepper motor has an integrated Planetary gearbox with a 50.9:1 gear ratio, the resolution reach 0.035 deg. step angle. It's a good solution in applications that need very low rotation speeds and/or lots of torque. Electrical Specification: * Manufacturer Part Number: 17HS19-1684S-PG51 * Motor Type: Bipolar Stepper * Step Angle: 0.035 deg. * Holding Torque: 4Nm * Rated Current/phase: 1.68A * Phase Resistance: 1.65ohms * Inductance: 2.8mH+/-20%(1KHz) Gearbox Specifications: * Gearbox Type: Planetary * Gear Ratio: 50.9:1 * Efficiency: 73% * Backlash at No-load: