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This bipolar Nema 23 stepper motor with 1.8 deg. step angle (200 steps/revolution). Each phase draws 2.8A, allowing for a holding torque of 1.26Nm(178.5oz.in). Electrical Specification: * Manufacturer Part Number: 23HS22-2804S * Motor Type: Bipolar Stepper * Step Angle: 1.8 deg. * Holding Torque: 1.26Nm(178.5oz.in) * Rated Current/phase: 2.8A * Phase Resistance: 0.9ohms * Inductance: 2.5mH+/-20%(1KHz) Physical Specification: * Frame Size: 57 x 57mm * Body Length: 56mm * Shaft Diameter: 6.35mm * Shaft Length: 20.6mm * Number of Leads: 4 * Lead Length: 300mm * Weight: 700g Connection: Black(A+), Green(A-), Red(B+), Blue(B-) Warning: Make sure the motor connect to a constant current or chopper drive controller before you test motor. Connecting the motor directly to a power supply will destroy the motor.