This is the most popular Nema 17 stepper motor in 3D printer market, with 1.8° step angle (200 steps/revolution). Each phase draws 1.68A, allowing for a holding torque of 44Ncm(62.3oz.in). It's very good choice for 3D printer, a rear shaft is made for encoder or equals.

Electrical Specification

* Manufacturer Part Number: 17HS19-1684D
* Motor Type: Bipolar Stepper
* Step Angle: 1.8°
* Holding Torque: 44Ncm(62.3oz.in)
* Rated Current/phase: 1.68A
* Phase Resistance: 1.65ohms
* Recommended Voltage: 12-24V
* Inductance : 2.8mH±20%(1KHz)

Physical Specification
* Frame Size: 42 x 42mm
* Body Length: 48mm
* Shaft Diameter: Φ5mm
* Front Shaft Length: 24mm
* Rear Shaft Length: 13mm
* Number of Leads: 4
* Lead Length: 500mm
* 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.