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Pololu 20D mm gearmotor with bracket and hub. |
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Gearmotor Dimensions:
The face plate has two mounting holes threaded for M2.5 screws. You can use our custom-designed 20D metal gearmotor bracket (pictured to the right) to mount the gearmotor to your project via these mounting holes and the screws that come with the bracket.
Please note that the 20Dx44L mm line of gearmotors have output shafts with a diameter of 4 mm. The Pololu universal aluminum mounting hub for 4mm shafts can be used to mount custom wheels and mechanisms to the gearmotor’s output shaft.
The picture below shows the dimensions (in mm) of the 20D mm line of gearmotors. The value of X is 16.75 mm for this version.
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25:1 and 67:1 20D mm metal gearmotor dimensions (units in mm). Note: this diagram only applies to the older and now-discontinued 25:1 and 67:1 gear ratio versions. |
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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.
Note: This motor is a lower-current, lower-power version of our 25:1 metal gearmotor 20Dx44L mm.
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Some of the Pololu metal gearmotors. |
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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 | 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 |
| 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 LP | 25:1 | 470 | 60 mA | 580 mA | 7 / 0.5 | 1.70 / 48 |
| 25:1 20Dx44L mm | 25:1 | 500 | 250 mA | 3300 mA | 40 / 2.9 | 1.70 / 48 |
| 67:1 20Dx45L mm | 67:1 | 210 | 250 mA | 3300 mA | 57 / 4.1 | 1.80 / 51 |
| 154:1 20Dx47L mm | 154:1 | 90 | 250 mA | 3300 mA | 122 / 8.8 | 1.85 / 52 |
| 19:1 37Dx52L mm | 19:1 | 256 | 250 mA | 2500 mA | 40 / 2.9 | 6.40 / 180 |
| 29:1 37Dx52L mm | 29:1 | 175 | 250 mA | 2500 mA | 55 / 4 | 6.40 / 180 |
| 50:1 37Dx54L mm | 50:1 | 101 | 250 mA | 2500 mA | 85 / 6 | 6.60 / 187 |
| 67:1 37Dx54L mm | 67:1 | 75 | 250 mA | 2500 mA | 100 / 7 | 6.60 / 187 |
| 100:1 37Dx57L mm | 100:1 | 50 | 250 mA | 2500 mA | 110 / 8 | 6.80 / 193 |
| 122:1 37Dx57L mm | 122:1 | 41 | 250 mA | 2500 mA | 125 / 9 | 6.80 / 193 |
* The stall torque should only be considered a rough estimate.
