Electrical Specification ： 
Manufacturer Part Number: 17HS1604-C5X
Motor Type: Bipolar Stepper
Step Angle: 1.8 deg
Holding Torque without Gearbox: 18mN.m
Rated Current/phase: 1.68A
Phase Resistance: 1.6ohms
Voltage: 2.8V
Inductance: 3.2mH ± 20%(1KHz)
 
Physical Specifications : 
Frame Size: 42 x 42mm
Motor Length: 48mm
Gearbox Length:27.3mm
Shaft Diameter: Φ8mm
Shaft Length: 22mm
Number of Leads: 4
Lead Length: 1000mm
Weight: 400g