This high precision NEMA 17 stepper motor has a built-in planetary gearbox with a speed ratio of 50.9:1, the resolution reaches 0.035 deg. step angle.
It is a good solution in applications that require very low rotational speeds and/or a lot of torque.

Electrical Specifications:

* Manufacturer part number: 17HS19-1684S-PG51
* Motor type: bipolar stepper
* Step angle: 0.035 deg.
* Holding torque: 4Nm
* Rated Current/Phase: 1.68A
* Phase Resistance: 1.65ohms
* Inductance: 2.8mH+/-20% (1KHz)

Gearbox Features
* Gearbox Type: Planetary
* Gear Ratio: 50.9:1
* Efficiency: 73%
* Backlash to No-load: * Maximum permissible torque: 4Nm(6000g)
* Allowable Torque: 6 Nm(950 oz)
* Maximum shaft axial load: 50N
* Maximum shaft radial load: 100N

Physical characteristics:
* Frame size: 42 x 42 mm
* Motor length: 48 mm
* Gearbox length: 42.7 mm
* Shaft diameter: 8 mm
* Shaft length: 20 mm
* D Cut Length: 15mm
* Number of tracks: 4
* Lead length: 500 mm
* Weight: 620g

Connection:

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

WARNING:

Make sure the motor connects to a constant current drive controller or chopper before testing the motor.
Connecting the motor directly to a power supply will destroy the motor.