This Nema 17 stepper motor with 33mm body and 0.4A rated current, integrated a planetary gearbox of 5.18:1 gear ratio. <br />Electrical Specification<br /><br /> Manufacturer Part Number: 17HS13-0404S-PG5<br /> Motor Type: Bipolar Stepper<br /> Step Angle: 0.35 deg<br /> Holding Torque without Gearbox: 26Ncm(36.82oz.in)<br /> Rated Current/phase: 0.4A<br /> Phase Resistance: 30ohms<br /> Voltage: 12V<br /> Inductance: 34mH ± 20%(1KHz)<br /><br />See details:https://www.oyostepper.com/goods-291-Nema-17-Stepper-Motor-Bipolar-L%3D33mm-w-Gear-Ratio-5-1-Planetary-Gearbox.html
