Linear stepper motor which named Nema 17 external linear actuator, the motor part is 40mm 1.8 degree 1.2A Nema 17 stepper motor. It was integrated with 250mm Tr8*8 threaded rod and a POM screw nut move along the threaded rod.
 
Electrical Specification : 
Manufacturer Part Number: 17HS3001-250N88
Motor Type: External Linear Stepper
Step Angle: 1.8 deg
Holding Torque: 40Ncm
Rated Current/phase: 1.2A
Phase Resistance: 30ohms
Voltage: 2.8V
Inductance: 37mH ± 20%(1KHz)

Physical Specification :
Frame Size: 42x 42mm
Body Length: 40mm
Lead Screw Length: 250m
Lead Screw Diameter: 8mm
Lead /Step: 2mm
Lead/Revolution: 8mm 
Number of Leads: 4
Lead Length: 700mm
Weight : 400g