Linear stepper motor which named Nema 17 external linear actuator, the motor part is 60mm 1.8 degree 1.68A Nema 17 stepper motor. It was integrated with 500mm Tr8*4 threaded rod and a POM screw nut move along the threaded rod.
 
Electrical Specification : 
Manufacturer Part Number: 17HS6002-500N84
Motor Type: External Linear Stepper
Step Angle: 1.8 deg
Holding Torque: 60Ncm
Rated Current/phase: 1.68A
Phase Resistance: 30ohms
Voltage: 2.8V
Inductance: 37mH ± 20%(1KHz)

Physical Specification :
Frame Size: 42x 42mm
Body Length: 60mm
Lead Screw Length: 500m
Lead Screw Diameter: 8mm
Lead /Step: 2mm
Lead/Revolution: 4mm 
Number of Leads: 4
Lead Length: 700mm
Weight : 400g