This gearmotor is a miniature (0.94" x 0.39" x 0.47"), high-quality, high-power motor with 50:1 metal gearbox, similar to Sanyo’s popular 12 mm gearmotors. These units have a 0.365"-long, D-shaped output shaft.
Gearmotor Dimensions:
This motor has a long (0.365" or 9.27 mm, not 8mm as shown in the drawing below), D-shaped metal output shaft that matches the Pololu wheel 42×19 mm, Pololu wheel 32×7 mm, and Solarbotics RW2 rubber wheel. The brass faceplate has two mounting holes threaded for M1.6 screws (1.6 mm diameter, 0.35 mm thread pitch), or you can use our mounting bracket or extended mounting bracket, which 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 42×19 mm.
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| Micro metal gearmotor dimensions (units in mm). |
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  | | Micro metal gearmotor with mounting bracket. |
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| |  | | Pololu wheel 32×7 mm on a micro metal gearmotor. |
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| |  | | Micro metal gearmotor and Pololu wheel 42×19 mm mounted with extended mounting bracket. |
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These 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.
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| Pololu metal gearmotors arranged by size from left to right: micro, 100:1 and 24:1 mini, 35:1 mini, and 25:1 20Dx44L mm. |
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Specs for the metal gearmotors running at 6 V:
| 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 |
2450 |
50 mA |
360 mA |
1 / 0.1 |
0.35 / 10 |
| 10:1 Micro |
10:1 |
1250 |
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 |
315 |
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 |
| 24:1 Mini |
24:1 |
410 |
70 mA |
420 mA |
4 / 0.3 |
0.80 / 27 |
| 100:1 Mini |
100:1 |
140 |
90 mA |
800 mA |
15 / 1.0 |
0.80 / 27 |
| 35:1 Mini |
35:1 |
350 |
70 mA |
1500 mA |
35 / 2.5 |
0.80 / 27 |
| 25:1 20Dx44L mm |
25:1 |
500 |
160 mA |
3300 mA |
40 / 2.9 |
1.70 / 48 |
| 19:1 37Dx52L mm |
19:1 |
250 |
170 mA |
2500 mA |
40 / 2.9 |
6.40 / 180 |
* The stall torque should only be considered a rough estimate.
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