Non-captive Linear stepper motor which named Nema 17 non-captive stepper, the motor part is 40mm 1.8 degree 1.67A Nema 17 stepper motor. It was integrated with 400mm Tr8*4 threaded rod . 
 
Electrical Specification : 
Manufacturer Part Number: NC17HS3001-400T84
Motor Type: External Linear Stepper
Step Angle: 1.8 deg
Holding Torque: 40Ncm
Rated Current/phase: 1.67A
Phase Resistance: 30ohms
Voltage: 3.2V
Inductance: 37mH ± 20%(1KHz)

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