This is high precision bipolar Nema 17 stepper motor with 0.9° step angle (400 steps/revolution). Each phase draws current 1.2A, allowing for a holding torque of 11Ncm(15.6oz.in). Electrical Specification * Manufacturer Part Number: 17HM08-1204S * Motor Type: Bipolar Stepper * Step Angle: 0.9° * Holding Torque: 11Ncm(15.6oz.in) * Rated Current/phase: 1.2A * Phase Resistance: 3.0ohms * Recommended Voltage: 12-24V * Inductance : 2.2mH±20%(1KHz) Physical Specification * Frame Size: 42 x 42mm * Body Length: 21mm * Shaft Diameter: Φ5mm * Shaft Length: 17mm * Number of Leads: 4 * Lead Length: 300mm * Weight : 150g 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.

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