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This high precision NEMA 23 Stepper motor has an integrated Planetary gearbox with a 15.3:1 gear ratio, the resolution reach 0.12° 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: 23HS22-2804S-PG15 * Motor Type: Bipolar Stepper * Step Angle: 0.12° * Holding Torque: 15.5Nm * Rated Current/phase: 2.8A * Phase Resistance: 0.9ohms * Recommended Voltage: 24-48V * Inductance : 2.5mH±20%(1KHz) Gearbox Specifications * Gearbox Type: Planetary * Gear Ratio : 15.3 * Efficiency: 81% * Backlash at No-load :