Mechanical Components » Motors and Gearboxes » Pololu Metal Gearmotors »
25:1 Metal Gearmotor
 
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This 2.23" x 0.80" x 0.80" gearmotor is a high-quality motor with 25:1 metal gearbox that has the power to deliver both speed and torque. These units have a 0.276"-long, 4 mm-diameter D-shaped output shaft.
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Gearmotor Dimensions:
The face plate has two mounting holes threaded for M2 screws. Note that these mounting holes are 13.5 mm apart, not 15 mm as shown in the diagram below. Additionally, unlike our other metal gearmotors, this unit has an output shaft that has a diameter of 4 mm rather than 3 mm.
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| 25:1 metal gearmotor dimensions (units in mm). The distance between the mounting holes is actually 13.5 mm. |
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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.
At 6 V, this gearmotor will have a no-load RPM of around 500 with a free-run current of 160 mA, a stall current of 3 A, and a stall torque of around 40 oz-in (2.88 kg-cm).
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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 medium. |
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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 Medium | 25:1 | 500 | 160 mA | 3300 mA | 40 / 2.9 | 1.70 / 48 |
* The stall torque should only be considered a rough estimate.
