This bipolar Nema 17 stepper motor with step angle 1.8deg and size 42x42x39mm. It has 4 wires, each phase draws current 1.5A, with holding torque 45Ncm (63.74oz.in).<br><br> <b>Electrical Specification</b><br><br> *Manufacturer Part Number: 17HS15-1504S-X1<br> *Motor Type: Bipolar Stepper<br> *Step Angle: 1.8 deg <br> *Holding Torque: 45Ncm(63.74oz.in)<br> *Rated Current/phase: 1.50A<br> *Phase Resistance: 2.3ohms<br> *Inductance: 4.4mH ± 20%(1KHz)<br> <br> <b>Physical Specification</b><br> *Frame Size: 42 x 42mm<br> *Body Length: 39mm<br> *Shaft Diameter: Φ5mm<br> *Shaft Length: 24mm<br> *D-cut Length: 15mm<br> *Number of Leads: 4<br> *Lead Length: 1000mm<br> *Weight: 280g<br> <br> <b>Connection</b><br><br> Black(A+), Green(A-), Red(B+), Blue(B-) <br><br> <b>Warning:</b><br><br> Make sure the motor connect to a constant current or chopper drive controller before you test motor. <br>Connecting the motor directly to a power supply will destroy the motor.