This is high torque Nema 17 stepper motor with 1.8 deg. step angle (200 steps/revolution).
Each phase draws 2A, allowing for a holding torque of 59Ncm(83.6oz.in). It's very good choice for 3D printer.

Electrical Specification:

* Manufacturer Part Number: 17HS19-2004S
* Motor Type: Bipolar Stepper
* Step Angle: 1.8 deg.
* Holding Torque: 59Ncm(83.6oz.in)
* Rated Current/phase: 2.0A
* Phase Resistance: 1.4ohms
* Inductance: 3.0mH+/-20%(1KHz)

Physical Specification:

* Frame Size: 1.65" x 1.65" (42 x 42mm)
* Body Length: 1.89" (48mm)
* Shaft Diameter: 0.2" (5mm)
* Shaft Length: 0.94" (24mm)
* D-cut Length: 0.59" (15mm）
* Number of Leads: 4
* Lead Length: 39.37" (1000mm) with connector
* Weight: 390g

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.