This bipolar Nema 17 stepper motor with step angle 1.8deg and size 42x42x38mm. It has 4 wires, each phase draws current 1.5A, with holding torque 42Ncm.

Electrical Specification:

* Motor Type: Bipolar Stepper
* Step Angle: 1.8 deg.
* Holding Torque: 60Ncm
* Rated Current/phase: 2.1A
* Phase Resistance: 1.7ohms
* Inductance: 3.1mH+/-20%(1KHz)

Physical Specification:

* Frame Size: 42 x 42mm
* Body Length: 25mm
* Shaft Diameter: 5mm
* Shaft Length: 24mm
* D-cut Length: 15mm
* Number of Leads: 4
* Lead Length: 90mm
* Weight: 157g

Connection:

Black(A+), Green(A-), Red(B+), Blue(B-)

Warning:

***On some systems, the middle 2 wires on the motor side are swapped. This is easy to fix by slightly prying back the white nubs and swapping the wires. Otherwise they work fine.***
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.