this is a worm gear nema 11 stepper motor,the shaft of stepper motor is made of worm shaft,to match the worm wheel of gearbox.
![step motor drawings](https://www.dec-motor.com/uploads/step-motor-drawings.jpg)
the datasheets:
![stepper motor datasheets](https://www.dec-motor.com/uploads/stepper-motor-datasheets.jpg)
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