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 offer a choice between three different motors: high-power (HP), medium-power (MP), 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 |
Stall Current @ 6 V |
No-Load Speed @ 6 V |
Stall Torque @ 6 V |
Gearbox Shaft Only |
Gearbox & Motor Shafts |
high-power (HP) |
1600 mA |
6000 RPM |
2 oz-in |
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3000 RPM |
4 oz-in |
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1000 RPM |
9 oz-in |
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625 RPM |
15 oz-in |
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400 RPM |
22 oz-in |
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320 RPM |
30 oz-in |
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200 RPM |
40 oz-in |
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140 RPM |
50 oz-in |
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120 RPM |
60 oz-in |
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100 RPM |
70 oz-in |
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32 RPM |
125 oz-in |
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medium-power (MP) |
700 mA |
2200 RPM |
3 oz-in |
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730 RPM |
8 oz-in |
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420 RPM |
13 oz-in |
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290 RPM |
17 oz-in |
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220 RPM |
19 oz-in |
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150 RPM |
24 oz-in |
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75 RPM |
46 oz-in |
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low-power |
360 mA |
2500 RPM |
1 oz-in |
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1300 RPM |
2 oz-in |
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440 RPM |
4 oz-in |
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250 RPM |
7 oz-in |
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170 RPM |
9 oz-in |
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120 RPM |
12 oz-in |
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85 RPM |
17 oz-in |
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60 RPM |
27 oz-in |
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50 RPM |
32 oz-in |
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45 RPM |
40 oz-in |
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14 RPM |
70 oz-in |
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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.
Micro metal gearmotor dimensions (units in mm). |
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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 1mm 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.
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.
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