1000:1 Micro Metal Gearmotor View larger

1000:1 Micro Metal Gearmotor

Pololu #1596

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These tiny, high-torque gearmotors have the highest gear ratio of any motor we sell, which makes them a great choice for applications that require extremely low motor speeds.

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These tiny, high-torque gearmotors have the highest gear ratio of any motor we sell, which makes them a great choice for applications that require extremely low motor speeds. With no load, the 1000:1 micro metal gearmotor HP output shaft turns at approximately 32 RPM at 6 V, and we were able to achieve rotation rates of around 2.5 RPM at 0.5 V on a test unit (note that performance will vary slightly from unit to unit). The lower-power 1000:1 micro metal gearmotor is even slower, with a no-load rotation rate of approximately 14 RPM at 6 V, and we were able to a achieve smooth rotation speed of around 1 RPM at 0.6 V on a test unit.

Note: Because of the high gear ratio, these motors can generate enough torque to damage themselves, so you should avoid stalling them.

These motors are intended for use at 6 V, though in general, these kinds of motors can run at voltages above and below this nominal voltage, so they should comfortably operate in the 3 – 9 V range (rotation can start at voltages as low as 0.5 V). Lower voltages might not be practical, and higher voltages could start negatively affecting the life of the motor.

Micro Metal Gearmotor Versions

The micro metal gearmotors are available in a wide range of gear ratios—from 5:1 up to 1000:1—and offer a choice between two different motors: high-power (HP) and standard. With the exception of the 1000:1 gear ratio versions, all of the micro metal gearmotors have the same physical dimensions, so one version can be easily swapped for another if your design requirements change. Please see the micro metal gearmotor comparison table for detailed specifications of all our micro metal gearmotors. This dynamically-sortable table can help you find the gearmotor that offers the best blend of speed, torque, and current-draw for your particular application. A more basic comparison table is available below.

Some versions of the gearmotors are sold with an additional 1mm-diameter output shaft that protrudes from the rear of the motor. This 4.5mm-long rear shaft rotates at the same speed as the input to the gearbox and offers a way to add a custom-built encoder to provide motor speed or position feedback.

Motor Type

@ 6 V

@ 6 V

Stall Torque
@ 6 V

Gearbox Shaft Only

Gearbox & Motor Shafts


1600 mA

6000 RPM

2 oz-in

5:1 micro HP


3000 RPM

4 oz-in

10:1 micro HP

10:1 micro HP

1000 RPM

9 oz-in

30:1 micro HP

30:1 micro HP

625 RPM

15 oz-in

50:1 micro HP

50:1 micro HP

400 RPM

22 oz-in

75:1 micro HP


320 RPM

30 oz-in

100:1 micro HP

100:1 micro HP

200 RPM

40 oz-in

150:1 micro HP


140 RPM

50 oz-in

210:1 micro HP


120 RPM

60 oz-in

250:1 micro HP


100 RPM

70 oz-in

298:1 micro HP

298:1 micro HP

32 RPM

125 oz-in

1000:1 micro HP



700 mA

2200 RPM

3 oz-in

10:1 micro MP


730 RPM

8 oz-in

30:1 micro MP


420 RPM

13 oz-in

50:1 micro MP


290 RPM

17 oz-in

75:1 micro MP


220 RPM

19 oz-in

100:1 micro MP


150 RPM

24 oz-in

150:1 micro MP


75 RPM

46 oz-in

298:1 micro MP



360 mA

2500 RPM

1 oz-in

5:1 micro


1300 RPM

2 oz-in

10:1 micro


440 RPM

4 oz-in

30:1 micro

30:1 micro

250 RPM

7 oz-in

50:1 micro

50:1 micro

170 RPM

9 oz-in

75:1 micro


120 RPM

12 oz-in

100:1 micro

100:1 micro

85 RPM

17 oz-in

150:1 micro


60 RPM

27 oz-in

210:1 micro


50 RPM

32 oz-in

250:1 micro


45 RPM

40 oz-in

298:1 micro

298:1 micro

14 RPM

70 oz-in

1000:1 micro



Note: The 1000:1 gearmotors can generate enough torque to damage themselves. The stall torque values given for those two motors are theoretical, and we strongly recommend you avoid stalling them. 

Details for item #1596

Exact gear ratio: 25×34×35×34×34×34×2712×9×12×14×14×14×9986.41:1

Gearmotor Dimensions

The diagram below shows the dimensions for this gearmotor. The 1000:1 gear ratio version of the micro metal gearmotor has a longer gearbox than other micro metal gearmotor versions (12.5 mm for the 1000:1 compared to 9 mm for all gear ratios). All the other dimensions match those of the other micro metal gearmotor versions.

                                   1000:1 micro metal gearmotor dimensions (units in mm).

The gearbox has a long (0.365" or 9.27 mm), 3 mm-diameter D-shaped metal output shaft, and the brass faceplate has two mounting holes threaded for M1.6 screws (1.6 mm diameter, 0.35 mm thread pitch). It weighs approximately 0.37 oz (11 g).

Note: Due to the longer gearbox, the 1000:1 micro metal gearmotors do not work with the encoder for Pololu wheel 42×19mm. These gearmotors can be used with our micro metal gearmotor bracket and extended bracket, but these brackets will not cover the entire gearbox the way they do when used with other gear ratios of micro metal gearmotors.

Motor Accessories


       Pololu wheel 32×7mm on a                  Pololu wheel 42×19mm with                             A pair of Pololu universal                            micro metal gearmotor                          micro metal gearmotor                                  aluminum mounting hubs for                                                                                                                                                               3 mm diameter shafts.                                 


                       Black Pololu 70×8mm wheel on a                  Black Pololu 90×10mm wheel on a 

                         Pololu micro metal gearmotor                         Pololu micro metal gearmotor.

  • Motor Controllers: We have a number of motor controllers that make it easy to drive these micro metal gearmotors, including our qik 2s9v1 dual serial motor controllerand our programmable Baby Orangutan and Orangutan SVP robot controllers. The inexpensive qik 2s9v1 allows variable speed and direction control of two small, brushed DC motors using a simple serial interface; the Orangutans combine a programmable Atmel AVR microcontroller and dual motor driver all in a single package and make interfacing with the motor drivers simple when you use our Pololu AVR library. All of the above controllers use the TB6612FNG dual motor driver, for which we also offer a simple carrier board.


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1000:1 Micro Metal Gearmotor

1000:1 Micro Metal Gearmotor

These tiny, high-torque gearmotors have the highest gear ratio of any motor we sell, which makes them a great choice for applications that require extremely low motor speeds.