This model is economy linear stepper motor which named Nema 11 external linear actuator, the motor part is 51mm 1.8 degree 0.67A Nema 11 stepper motor. It was integrated with 100mm Tr5*2 threaded rod and a POM screw nut move along the threaded rod.
 
Electrical Specification : 
Manufacturer Part Number: 11HY5401-150N5*2
Motor Type: External Linear Stepper
Step Angle: 1.8 deg
Holding Torque: 8.0Ncm(11.1oz.in)
Rated Current/phase: 0.67A
Phase Resistance: 3.2ohms
Voltage: 2.4V
Inductance: 2.0mH ± 20%(1KHz)
 
Physical Specification : 
Frame Size: 28 x 28mm
Body Length: 51mm
Lead Screw Length: 150mm（3.937"）
Lead Screw Diameter: Φ5mm
Lead /Step:1mm
Lead/Revolution: 2mm
Number of Leads: 4
Lead Length: 300mm
Weight : 150g