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42mm Planetary Gearbox ratio 3:1 4:1 5:1 10:1 Rated Torque 3.5N.m Nema17 Stepper Motor GearboxGearbox only! (gear ratio: 3:1 4:1 5:1 10:1. with connector pinion, yet without motor.)If want gearbox with motor together, contact us!Feature Description:Low noiseSpeed adjustableLong lifestyles characteristicsHigh torque Specification motor Stepper motor planetary gearbox:The gears 3:1 4:1 5:1 10: 1 belong to the 1-stage, Length = 44.5 mm: The compatible enter shaft of motor:should with unmarried flat variety and 5mm diameter*9mm length(Including pad height).More pictures of 42mm planetary gearbox: (Taken by means of ourself and with out PS, so the hot mtoro seems greater than photo.) Assembled with stepper motor nema 17:See the threaded hole within the photograph 42mm Planetary Gearbox * 1