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150:1 Micro MotoReductor Metalico HighPower Ampliar

150:1 Micro MotoReductor Metalico HighPower


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This gearmotor is a miniature high-power brushed DC motor with a 150.58:1 metal gearbox. It has a cross section of 10 × 12 mm, and the D-shaped gearbox output shaft is 9 mm long and 3 mm in diameter.

Key specs at 6 V: 200 RPM and 120 mA with no load, 40 oz-in (2.9 kg-cm) and 1.6 A at stall.


These tiny brushed DC gearmotors 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. The micro metal gearmotors are available in a wide range of gear ratios—from 5:1 up to 1000:1—and with four different motors: high-power with long-life carbon brushes (HPCB), high-power with shorter-life precious metal brushes (HP), medium-power (MP), and low-power. The HPCB version (shown on the left in the picture below) can be differentiated from versions with precious metal brushes (shown on the right) by its copper-colored terminals and slightly less shiny case. Note that the HPCB terminals are 0.5 mm wider than those on the other micro metal gearmotor versions (2 mm vs. 1.5 mm), and they are about 1 mm closer together (6 mm vs. 7 mm).



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 available with an additional 1 mm-diameter output shaft that protrudes from the rear of the motor. This 4.5 mm-long rear shaft rotates at the same speed as the input to the gearbox and offers a way to add an encoder, such as our magnetic encoder for micro metal gearmotors (see the picture on the right), to provide motor speed or position feedback.



Motor TypeStall
@ 6 V
@ 6 V
Stall Torque
@ 6 V

(Gearbox Only)

(Gearbox & Motor)
carbon brushes
1600 mA3000 RPM4 oz-in10:1 HPCB 
1000 RPM9 oz-in30:1 HPCB 
625 RPM15 oz-in50:1 HPCB 
400 RPM22 oz-in75:1 HPCB 
320 RPM30 oz-in100:1 HPCB 
200 RPM40 oz-in150:1 HPCB 
140 RPM50 oz-in210:1 HPCB 
120 RPM60 oz-in250:1 HPCB 
100 RPM70 oz-in298:1 HPCB 
32 RPM125 oz-in1000:1 HPCB 

(same specs as
HPCB above)
1600 mA6000 RPM2 oz-in5:1 HP 
3000 RPM4 oz-in10:1 HP10:1 HP dual-shaft
1000 RPM9 oz-in30:1 HP30:1 HP dual-shaft
625 RPM15 oz-in50:1 HP50:1 HP dual-shaft
400 RPM22 oz-in75:1 HP75:1 HP dual-shaft
320 RPM30 oz-in100:1 HP100:1 HP dual-shaft
200 RPM40 oz-in150:1 HP150:1 HP dual-shaft
140 RPM50 oz-in210:1 HP 
120 RPM60 oz-in250:1 HP 
100 RPM70 oz-in298:1 HP298:1 HP dual-shaft
32 RPM125 oz-in1000:1 HP1000:1 HP dual-shaft
700 mA2200 RPM3 oz-in10:1 MP10:1 MP dual-shaft
730 RPM8 oz-in30:1 MP 
420 RPM13 oz-in50:1 MP 
290 RPM17 oz-in75:1 MP75:1 MP dual-shaft
220 RPM19 oz-in100:1 MP100:1 MP dual-shaft
150 RPM24 oz-in150:1 MP 
75 RPM46 oz-in298:1 MP 
low-power360 mA2500 RPM1 oz-in5:1 
1300 RPM2 oz-in10:1 
440 RPM4 oz-in30:130:1 dual-shaft
250 RPM7 oz-in50:150:1 dual-shaft
170 RPM9 oz-in75:1 
120 RPM12 oz-in100:1100:1 dual-shaft
85 RPM17 oz-in150:1 
60 RPM27 oz-in210:1 
50 RPM32 oz-in250:1 
45 RPM40 oz-in298:1298:1 dual-shaft
14 RPM70 oz-in1000:1 

Note: Stalling gearmotors can greatly decrease their lifetimes, occasionally resulting in immediate damage to the gearbox. This is especially true for the higher gear ratios, such as the 298:1 and 1000:1 versions, which can generate enough torque to damage themselves. The stall torque values given for the two 1000:1 motors are theoretical, and we strongly recommend you avoid stalling them. Prolonged stalls (on the order of seconds) can result in thermal damage to the motor windings and brushes, especially for the versions that use high-power (HP) motors.


Details for item #997


Exact gear ratio: 25×32×34×35×3812×11×14×13×10150.58:1


Gearmotor Dimensions


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). The gearmotor weighs approximately 0.35 oz (10 g). Versions with the extended motor shaft have a 1 mm-diameter round shaft that protrudes 4.5 mm from the rear of the motor, between the two motor terminals; this is not pictured in the above dimension diagram. In terms of size, these gearmotors are very similar to Sanyo’s popular 12 mm NA4S DC gearmotors, and gearmotors with this form factor are occasionally referred to as N20 motors.

The gearbox on the 1000:1 and 1000:1 HP micro metal gearmotors is 12.5 mm long. All of the other micro metal gearmotors have 9mm-long gearboxes, as shown in the above dimension diagram.

Motor Accessories

  • Wheels and hubs: The micro metal gearmotor’s output shaft matches our assortment of Pololu wheels and the Solarbotics RW2i rubber wheel. You can also use our Pololu universal mounting hubs to mount custom wheels and mechanism to the micro metal gearmotor’s output shaft, and you can use our 12mm hex wheel adapter to use this motor with many common hobby RC wheels.
Pololu wheel 32×7mm on a micro metal gearmotor.
Black Pololu 70×8mm wheel on a Pololu micro metal gearmotor.
A pair of Pololu universal aluminum mounting hubs for 3 mm diameter shafts.


12mm Hex Wheel Adapter for 3mm Shaft on a Micro Metal Gearmotor.


  • Mounting brackets: Our mounting bracket (also available in white) and extended mounting bracket are specifically designed to securely mount the gearmotor while enclosing the exposed gears. We recommend the extended mounting bracket for wheels with recessed hubs, such as the Pololu wheel 42×19mm. Our micro metal gearmotors will also work with our 15.5D mm metal gearmotor bracket pair.


Black micro metal gearmotor mounting bracket pair with included screws and nuts.
White micro metal gearmotor mounting bracket pair with included screws and nuts.
Pololu micro metal gearmotor bracket extended with micro metal gearmotor.


  • Quadrature encoders: We offer several quadrature encoders that work with our micro metal gearmotors.


Magnetic Encoder Kit for Micro Metal Gearmotors assembled with ribbon cable wires.
Example of an installed micro metal gearmotor reflective optical encoder.
Encoder for Pololu wheel 42×19mm with wheel, motor, and bracket.


  • Motor controllers and drivers: We have a number of motor controllers that make it easy to drive these micro metal gearmotors, including our qik 2s9v1 dual serial motor controller and our programmableBaby Orangutan and Orangutan SVP robot controllers. The 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. We also carry a number of basicmotor drivers suitable for use with these motors, including the DRV8838 single-channel motor driver carrier, the DRV8833 dual motor driver carrier, the DRV8835 dual motor driver carrier, and the TB6612FNG dual motor driver carrier.


Pololu qik 2s9v1 dual serial motor controller.
Baby Orangutan B-48/B-168/B-328.
DRV8835 dual motor driver carrier.


We also incorporate these motors into some of our products, including our Zumo robot and 3pi robot :

Assembled Zumo 32U4 robot.
Pololu 3pi robot.


Selecting the Right Gearmotor

We offer a wide selection of metal gearmotors that offer different combinations of speed and torque. Our metal gearmotor comparison table can help you find the motor that best meets your project’s requirements.


Some of the Pololu metal gearmotors.