This is one of strongest bipolar Nema 17 stepper motor with 1.8 deg. step angle (200 steps/revolution).
Each phase draws 2.1A, allowing for a holding torque up to 65Ncm(92oz.in).

Electrical Specification:

* Manufacturer Part Number: 17HS24-2104S
* Motor Type: Bipolar Stepper
* Step Angle: 1.8 deg.
* Holding Torque: 65Ncm(92oz.in)
* Rated Current/phase: 2.1A
* Phase Resistance: 1.6ohms
* Inductance: 3mH+/-20%(1KHz)

Physical Specification:

* Frame Size: 42 x 42mm
* Body Length: 60mm
* Shaft Diameter: 5mm
* Shaft Length: 24mm
* D-cut Length: 15mm
* Number of Leads: 4
* Lead Length: 500mm
* Weight: 500g

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.