Small Reduction Stepper Motor - 12VDC 32-Step 1/16 Gearing

Product ID: 918
Qty Discount
1-9 $4.95
10-99 $4.46
100+ $3.96


This is a great first stepper motor, good for small projects and experimenting with steppers. This uni-polar motor has a built in mounting plate with two mounting holes. There are only 32 step (11.25 degree) per revolution, and inside is a 1/16 reduction gear set. (Actually its 1/16.128 but for most purposes 1/16 is a good enough approximation) What this means is that there are really 32*16.128 steps per revolution = 516.096 steps! The shaft is flattened so its easy to attach stuff to it with a set-screw. A perfect first stepper motor and works well with the Motor Shield for Arduino.

The gearing has a few side effects which are important to note. First, you shouldn't use interleaved or micro-stepping to control or it will take forever to turn. Instead use single or double stepping. The torque is fairly high but its slower than un-geared steppers - we maxed out at about 20 RPM when powering with 12VDC and about 12 RPM on 9VDC.

To use with the Adafruit Motor Shield, connect red to ground (middle), orange and pink to one motor port (say M1) and blue and yellow to the other motor port (say M2). So in order, thats: orange - pink - red - blue - yellow. Then just use the example code that comes with the Adafruit Motor Shield library and set the constructor to Adafruit_StepperMotor *myMotor = AFMS.getStepper(516 ,motornum) and the speed at 5 RPM by calling motor->setSpeed(5). Otherwise, you can also wire it up with some transistors and use the Arduino Stepper library

Technical Details

Revision History:

  • As of Jan 2021, these have been coming with 1/64 gearing rather than 1/16 gearing!
  • As of Nov 2021, we now have them back with 1/16 gearing as we prefer!


  • Unipolar stepper with 0.1" spaced 5-pin cable connector
  • 2052 steps per revolution
  • 1/16.128 geared down reduction
  • 5V-12V DC suggested operation
  • Weight: 37 g.
  • Dimensions: 28mm diameter, 20mm tall not including 9mm shaft with 5mm diameter
  • 9" / 23 cm long cable
  • Holding Torque @ 12VDC: 62 gram-force*cm, 6 N*mm, 1 oz-force*in
  • Shaft: 5mm diameter flattened

Dimensional diagrams for stepper motor including housing, mount, cabling, and connector
Dimensional and wiring diagram for stepper motor

RoHS 2 2011 65 EU Compliant


Stackable, high current DC and Stepper motor shield
Choose the right motor (and controller) for the job!
The Adafruit guide to choosing and using stepper motors.
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