This is the smallest high precision NEMA 8 Stepper motor, it has an integrated Planetary gearbox with a 19:1 gear ratio, the resolution reach 0.095 deg. step angle.
It's a good solution in applications that need very low rotation speeds and/or lots of torque.

Electrical Specification:

* Manufacturer Part Number: 8HS15-0604S-PG19
* Motor Type: Bipolar Stepper
* Step Angle: 0.095 deg.
* Holding Torque: 61.56Ncm
* Rated Current/phase: 0.6A
* Phase Resistance: 10ohms
* Inductance: 5.5mH+/-20%(1KHz)

Gearbox Specifications:
* Gearbox Type: Planetary
* Gear Ratio: 19:1
* Efficiency: 81%
* Backlash at No-load: * Max.Permissible Torque: 0.5Nm(70.8oz-in)
* Moment Permissible Torque: 1Nm(141.6oz-in)
* Shaft Maximum Axial Load: 5N
* Shaft Maximum Radial Load: 25N

Physical Specifications:
* Frame Size: 22 x 22mm
* Motor Length: 38mm
* Gearbox Length: 29.95mm
* Shaft Diameter: 6mm
* Shaft Length: 15mm
* D-cut Length: 9mm
* Number of Leads: 4
* Lead Length: 300mm
* Weight: 130g

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.