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This is one of the most popular Nema 23 stepper motor, it with step angle 1.8deg and size 57x57x76mm. It has 4 wires, each phase draws 3A, with holding torque 1.9Nm (269oz.in). Electrical Specification *Manufacturer Part Number: 23HS30-3004S *Motor Type: Bipolar Stepper *Step Angle: 1.8 deg *Holding Torque: 1.9Nm(269oz.in) *Rated Current/phase: 3A *Voltage: 3.36V *Phase Resistance: 1.12ohms *Inductance: 4.8mH ± 20%(1KHz) Physical Specification *Frame Size: 57 x 57mm *Body Length: 76mm *Shaft Diameter: Φ6.35mm *Shaft Length: 21mm *D-cut Length: 15mm *Number of Leads: 4 *Lead Length: 500mm *Weight: 1.2kg Connection: Black: A+, Green: A-, Red: B+, Blue: B-