Tips: If you need large quantity for this item,we can provide wholesale with discount for you,please contact us if you need.Thank you. Specification: Brand new micro 2-phase 4-wire 5mm stepper motor,with planetary gearbox reducer,the planetary reducer adopts an all metal structure, including a metal outer wall and a secondary metal gear, and then drives a precision bevel screw driver to drive the metal slider to move up and down. The bracket is also made of metal, and the driver uses ultra micro precision ball bearings. It is estimated that this is the adjusting motor for the telescopic lens of high-end mobile phones. Parameters: 1.Stepper motor diameter: 5mm 2.Gear motor length: 12.1mm 3.Nut stroke: about 8.5mm 4.Total length: 30.4mm(motor+slider) 5.Total width: 15.2mm 6.Planetary gearbox: Secondary metal planetary gear 7.Gear ratio: 1:20 8.Phase resistance: 14 ohms (Parameters on the test report) 9.Output torque: 300g (Parameters on the test report) 10.Weight: about 3.5g 11.Note: This motor is planetary gear stepper motor,it is precision motor with exquisite workmanship.It needs the stepper motor driver to drive.We suggest that the buyers who know how to use it can buy because we do not provide technical support. Package List: Mini 5mm Stepper Motor x 1pcs