This model is economy linear stepper motor which named Nema 8 external linear actuator, the motor part is 30mm 1.8 degree 0.6A Nema 8 stepper motor. It was integrated with 100mm Tr4.76x0.635 threaded rod and a POM screw nut move along the threaded rod.
 
Electrical Specification : 
Manufacturer Part Number: 8HY001-100N476
Motor Type: External Linear Stepper
Step Angle: 1.8 deg
Holding Torque: 18mN.m 
Rated Current/phase: 0.6A
Phase Resistance: 3.2ohms
Voltage: 3.9V
Inductance: 2.0mH ± 20%(1KHz)
 
Physical Specification : 
Frame Size: 20 x 20mm
Body Length: 30mm
Lead Screw Length: 100mm（3.937"）
Lead Screw Diameter: Φ4.76mm（0.1874"）
Lead /Step: 0.003175mm(0.000125" )
Lead/Revolution: 0.635mm（0.025"）
Number of Leads: 4
Lead Length: 300mm
Weight : 150g