Linear stepper motor which named Nema 17 external linear actuator, the motor part is 48mm 1.8 degree 1.68A Nema 17 stepper motor. It was integrated with 280mm Tr8*1 threaded rod and a POM screw nut move along the threaded rod.
Electrical Specification
Manufacturer Part Number: 42HS48-280N81
Motor Type: External Linear Stepper
Step Angle: 1.8 deg
Holding Torque: 44Ncm
Rated Current/phase: 1.68A
Phase Resistance: 30ohms
Voltage: 2.3V
Inductance: 37mH ± 20%(1KHz)
Physical Specification
Frame Size: 42x 42mm
Body Length: 48mm
Lead Screw Length: 280m
Lead Screw Diameter: 8mm
Lead /Step: 1mm
Lead/Revolution: 1mm 
Number of Leads: 4
Lead Length: 1000mm
Weight : 350g