Overview
These tiny, high-quality motors are intended for use at 6 V. 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. Lower voltages might not be practical, and higher voltages could start negatively affecting the life of the motor. All of the micro metal gearmotors have the same physical dimensions, but they come in a wide range of gear ratios—from 5:1 up to 298:1—and let you choose between two different motors: high-power (HP) and standard. This means you can choose the version that has the ideal blend of speed, torque, and current-draw for your particular application. Please see the table at the bottom of this page for detailed specifications, or look at micro metal gearmotor comparison table.
Gearmotor Dimensions
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Micro metal gearmotor
dimensions (units in mm). |
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This motor has a long (0.365" or 9.27 mm), 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 0.35 oz (10 g).
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Specs for the metal gearmotors running at 6
gearmotor |
gear ratio |
free-run RPM |
free-run current |
stall current |
stall torque* (oz-in / kg-cm) |
weight (oz / g) |
5:1 Micro |
5:1 |
2500 |
50 mA |
360 mA |
1 / 0.1 |
0.35 / 10 |
10:1 Micro |
10:1 |
1300 |
40 mA |
360 mA |
2 / 0.2 |
0.35 / 10 |
30:1 Micro |
30:1 |
440 |
40 mA |
360 mA |
4 / 0.3 |
0.35 / 10 |
50:1 Micro |
50:1 |
250 |
40 mA |
360 mA |
6 / 0.4 |
0.35 / 10 |
100:1 Micro |
100:1 |
120 |
40 mA |
360 mA |
10 / 0.7 |
0.35 / 10 |
150:1 Micro |
150:1 |
85 |
40 mA |
360 mA |
15 / 1.1 |
0.35 / 10 |
210:1 Micro |
210:1 |
60 |
40 mA |
360 mA |
19 / 1.3 |
0.35 / 10 |
250:1 Micro |
250:1 |
50 |
30 mA |
360 mA |
22 / 1.6 |
0.35 / 10 |
298:1 Micro |
298:1 |
45 |
30 mA |
360 mA |
25 / 1.8 |
0.35 / 10 |
5:1 Micro HP |
5:1 |
6000 |
120 mA |
1600 mA |
2 / 0.1 |
0.35 / 10 |
10:1 Micro HP |
10:1 |
3000 |
120 mA |
1600 mA |
4 / 0.3 |
0.35 / 10 |
30:1 Micro HP |
30:1 |
1000 |
120 mA |
1600 mA |
8 / 0.6 |
0.35 / 10 |
50:1 Micro HP |
50:1 |
625 |
100 mA |
1600 mA |
15 / 1.0 |
0.35 / 10 |
100:1 Micro HP |
100:1 |
320 |
80 mA |
1600 mA |
25 / 1.8 |
0.35 / 10 |
150:1 Micro HP |
150:1 |
200 |
70 mA |
1600 mA |
45 / 3.2 |
0.35 / 10 |
210:1 Micro HP |
210:1 |
140 |
70 mA |
1600 mA |
65 / 4.7 |
0.35 / 10 |
250:1 Micro HP |
250:1 |
120 |
70 mA |
1600 mA |
75 / 5.4 |
0.35 / 10 |
298:1 Micro HP |
298:1 |
100 |
70 mA |
1600 mA |
90 / 6.5 |
0.35 / 10 |
* The stall torque should only be considered a rough estimate.