This hybrid bipolar stepper motor is a mini stepper motor we carry, it with 1.8 deg. step angle (200 steps/revolution). Each phase draws 600 mA at 2.7 V, allowing for a holding torque of 1.8Ncm(2.6oz.in). Electrical Specification: * Manufacturer Part Number:20HS3406A4 * Motor Type: Bipolar Stepper * Step Angle: 1.8 deg. * Holding Torque: 1.8Ncm(2.6oz.in) * Rated Current/phase: 0.6A * Phase Resistance: 4.5ohms *Inductance: 0.9mH+/-20%(1KHz) Physical Specification: * Frame Size: 20 x 20mm * Body Length: 34mm * Shaft Diameter: 4mm * Shaft Length: 20mm * D-cut Length: 15mm * .Number of Leads: 4 * Lead Length: 600mm * Weight:70g 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.