This bipolar Nema 23 stepper motor is most popular, it with 1.8 deg. step angle (200 steps/revolution).
Each phase draws 2.8A, allowing for a holding torque of 1.9Nm(269oz.in).

Electrical Specification:

* Manufacturer Part Number: 23HS30-2804S
* Motor Type: Bipolar Stepper
* Step Angle: 1.8 deg.
* Holding Torque: 1.9Nm(269oz.in)
* Rated Current/phase: 2.8A
* Phase Resistance: 1.13ohms
* Inductance: 5.4mH+/-20%(1KHz)

Physical Specification:

* Frame Size: 57 x 57mm
* Body Length: 76mm
* Shaft Diameter: 6.35mm
* Shaft Length: 21mm
* D-cut Length: 15mm
* Number of Leads: 4
* Lead Length: 500mm
* Weight: 1.2kg

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.