Motors and Gearboxes » Pololu Metal Gearmotors » 25D Metal Gearmotors »
12V Medium-Power (MP) 25D mm Gearmotors
These 25D mm gearmotors have medium-power (MP), 12 V motors with a stall current of 2.1 A and a typical free-run current of 150 mA. The gearboxes, which are available in a wide range of gear ratios, all have 4 mm diameter, D-shaped output shafts. The following table shows all of the versions available with the MP 12V motor:
| Rated Voltage |
Motor Type | Stall Current @ Rated Voltage |
No-Load Speed @ Rated Voltage |
Approximate Stall Torque @ Rated Voltage |
 With Encoder |
 Without Encoder |
|---|---|---|---|---|---|---|
| 12 V | medium-power (MP) |
2.1 A | 7800 RPM | 2.7 oz-in | 1:1 MP 12V w/encoder | |
| 1700 RPM | 11 oz-in | 4.4:1 MP 12V w/encoder | 4.4:1 MP 12V | |||
| 770 RPM | 22 oz-in | 9.7:1 MP 12V w/encoder | 9.7:1 MP 12V | |||
| 370 RPM | 42 oz-in | 20.4:1 MP 12V w/encoder | 20.4:1 MP 12V | |||
| 220 RPM | 63 oz-in | 34:1 MP 12V w/encoder | 34:1 MP 12V | |||
| 160 RPM | 85 oz-in | 47:1 MP 12V w/encoder | 47:1 MP 12V | |||
| 100 RPM | 125 oz-in | 75:1 MP 12V w/encoder | 75:1 MP 12V | |||
| 76 RPM | 165 oz-in | 99:1 MP 12V w/encoder | 99:1 MP 12V | |||
| 43 RPM | 250 oz-in | 172:1 MP 12V w/encoder | 172:1 MP 12V | |||
| 33 RPM | 320 oz-in | 227:1 MP 12V w/encoder | 227:1 MP 12V | |||
Note: Stalling or overloading gearmotors can greatly decrease their lifetimes and even result in immediate damage. For these gearboxes, the recommended upper limit for instantaneous torque is 15 kg-cm (200 oz-in); we strongly advise keeping applied loads well under this limit. Stalls can also result in rapid (potentially on the order of a second) thermal damage to the motor windings and brushes, especially for the versions that use high-power (HP) motors; a general recommendation for brushed DC motor operation is 25% or less of the stall current.
Versions with other motors are also available. You can use the following selection boxes to choose from all of our 25D metal gearmotor versions:
Alternatives available with variations in these parameter(s): gear ratio motor type encoders? Select variant…
Compare all products in this category
Products in category “12V Medium-Power (MP) 25D mm Gearmotors”
| Pololu item #: 3225 | |
| Brand: Pololu | |
| Status: Active and Preferred | |
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This gearmotor consists of a medium-power, 12 V brushed DC motor combined with a 4.4:1 metal spur gearbox. The gearmotor is cylindrical, with a diameter just under 25 mm, and the D-shaped output shaft is 4 mm in diameter and extends 12.5 mm from the face plate of the gearbox. This gearmotor is also available with an integrated encoder.
Key specifications:
| voltage | no-load performance | stall extrapolation |
|---|---|---|
| 12 V | 1700 RPM, 200 mA | 0.8 kg⋅cm (11 oz⋅in), 2.1 A |
| Pololu item #: 4861 | |
| Brand: Pololu | |
| Status: Active and Preferred | |
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Free shipping in USA
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This gearmotor consists of a medium-power, 12 V brushed DC motor combined with a 4.4:1 metal spur gearbox, and it has an integrated 48 CPR quadrature encoder on the motor shaft, which provides 211.2 counts per revolution of the gearbox’s output shaft. The gearmotor is cylindrical, with a diameter just under 25 mm, and the D-shaped output shaft is 4 mm in diameter and extends 12.5 mm from the face plate of the gearbox. This gearmotor is also available without an encoder.
Key specifications:
| voltage | no-load performance | stall extrapolation |
|---|---|---|
| 12 V | 1700 RPM, 200 mA | 0.8 kg⋅cm (11 oz⋅in), 2.1 A |
| Pololu item #: 3226 | |
| Brand: Pololu | |
| Status: Active and Preferred | |
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Free shipping in USA
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This gearmotor consists of a medium-power, 12 V brushed DC motor combined with a 9.68:1 metal spur gearbox. The gearmotor is cylindrical, with a diameter just under 25 mm, and the D-shaped output shaft is 4 mm in diameter and extends 12.5 mm from the face plate of the gearbox. This gearmotor is also available with an integrated encoder.
Key specifications:
| voltage | no-load performance | stall extrapolation |
|---|---|---|
| 12 V | 770 RPM, 200 mA | 1.6 kg⋅cm (22 oz⋅in), 2.1 A |
| Pololu item #: 4862 | |
| Brand: Pololu | |
| Status: Active and Preferred | |
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Free shipping in USA
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This gearmotor consists of a medium-power, 12 V brushed DC motor combined with a 9.68:1 metal spur gearbox, and it has an integrated 48 CPR quadrature encoder on the motor shaft, which provides 464.64 counts per revolution of the gearbox’s output shaft. The gearmotor is cylindrical, with a diameter just under 25 mm, and the D-shaped output shaft is 4 mm in diameter and extends 12.5 mm from the face plate of the gearbox. This gearmotor is also available without an encoder.
Key specifications:
| voltage | no-load performance | stall extrapolation |
|---|---|---|
| 12 V | 770 RPM, 200 mA | 1.6 kg⋅cm (22 oz⋅in), 2.1 A |
| Pololu item #: 3227 | |
| Brand: Pololu | |
| Status: Active and Preferred | |
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Free shipping in USA
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This gearmotor consists of a medium-power, 12 V brushed DC motor combined with a 20.4:1 metal spur gearbox. The gearmotor is cylindrical, with a diameter just under 25 mm, and the D-shaped output shaft is 4 mm in diameter and extends 12.5 mm from the face plate of the gearbox. This gearmotor is also available with an integrated encoder.
Key specifications:
| voltage | no-load performance | stall extrapolation |
|---|---|---|
| 12 V | 370 RPM, 200 mA | 3 kg⋅cm (42 oz⋅in), 2.1 A |
| Pololu item #: 4863 | |
| Brand: Pololu | |
| Status: Active and Preferred | |
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Free shipping in USA
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This gearmotor consists of a medium-power, 12 V brushed DC motor combined with a 20.4:1 metal spur gearbox, and it has an integrated 48 CPR quadrature encoder on the motor shaft, which provides 979.62 counts per revolution of the gearbox’s output shaft. The gearmotor is cylindrical, with a diameter just under 25 mm, and the D-shaped output shaft is 4 mm in diameter and extends 12.5 mm from the face plate of the gearbox. This gearmotor is also available without an encoder.
Key specifications:
| voltage | no-load performance | stall extrapolation |
|---|---|---|
| 12 V | 370 RPM, 200 mA | 3 kg⋅cm (42 oz⋅in), 2.1 A |
| Pololu item #: 3228 | |
| Brand: Pololu | |
| Status: Active and Preferred | |
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Free shipping in USA
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This gearmotor consists of a medium-power, 12 V brushed DC motor combined with a 34.014:1 metal spur gearbox. The gearmotor is cylindrical, with a diameter just under 25 mm, and the D-shaped output shaft is 4 mm in diameter and extends 12.5 mm from the face plate of the gearbox. This gearmotor is also available with an integrated encoder.
Key specifications:
| voltage | no-load performance | stall extrapolation |
|---|---|---|
| 12 V | 220 RPM, 200 mA | 4.5 kg⋅cm (63 oz⋅in), 2.1 A |
| Pololu item #: 4864 | |
| Brand: Pololu | |
| Status: Active and Preferred | |
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Free shipping in USA
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This gearmotor consists of a medium-power, 12 V brushed DC motor combined with a 34.014:1 metal spur gearbox, and it has an integrated 48 CPR quadrature encoder on the motor shaft, which provides 1632.67 counts per revolution of the gearbox’s output shaft. The gearmotor is cylindrical, with a diameter just under 25 mm, and the D-shaped output shaft is 4 mm in diameter and extends 12.5 mm from the face plate of the gearbox. This gearmotor is also available without an encoder.
Key specifications:
| voltage | no-load performance | stall extrapolation |
|---|---|---|
| 12 V | 220 RPM, 200 mA | 4.5 kg⋅cm (63 oz⋅in), 2.1 A |
| Pololu item #: 3229 | |
| Brand: Pololu | |
| Status: Active and Preferred | |
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Free shipping in USA
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This gearmotor consists of a medium-power, 12 V brushed DC motor combined with a 46.85:1 metal spur gearbox. The gearmotor is cylindrical, with a diameter just under 25 mm, and the D-shaped output shaft is 4 mm in diameter and extends 12.5 mm from the face plate of the gearbox. This gearmotor is also available with an integrated encoder.
Key specifications:
| voltage | no-load performance | stall extrapolation |
|---|---|---|
| 12 V | 160 RPM, 200 mA | 6 kg⋅cm (85 oz⋅in), 2.1 A |
| Pololu item #: 4865 | |
| Brand: Pololu | |
| Status: Active and Preferred | |
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Free shipping in USA
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This gearmotor consists of a medium-power, 12 V brushed DC motor combined with a 46.85:1 metal spur gearbox, and it has an integrated 48 CPR quadrature encoder on the motor shaft, which provides 2248.86 counts per revolution of the gearbox’s output shaft. The gearmotor is cylindrical, with a diameter just under 25 mm, and the D-shaped output shaft is 4 mm in diameter and extends 12.5 mm from the face plate of the gearbox. This gearmotor is also available without an encoder.
Key specifications:
| voltage | no-load performance | stall extrapolation |
|---|---|---|
| 12 V | 160 RPM, 200 mA | 6 kg⋅cm (85 oz⋅in), 2.1 A |
| Pololu item #: 3230 | |
| Brand: Pololu | |
| Status: Active and Preferred | |
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Free shipping in USA
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This gearmotor consists of a medium-power, 12 V brushed DC motor combined with a 74.83:1 metal spur gearbox. The gearmotor is cylindrical, with a diameter just under 25 mm, and the D-shaped output shaft is 4 mm in diameter and extends 12.5 mm from the face plate of the gearbox. This gearmotor is also available with an integrated encoder.
Key specifications:
| voltage | no-load performance | stall extrapolation |
|---|---|---|
| 12 V | 100 RPM, 200 mA | 9 kg⋅cm (125 oz⋅in), 2.1 A |
| Pololu item #: 4866 | |
| Brand: Pololu | |
| Status: Active and Preferred | |
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Free shipping in USA
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This gearmotor consists of a medium-power, 12 V brushed DC motor combined with a 74.83:1 metal spur gearbox, and it has an integrated 48 CPR quadrature encoder on the motor shaft, which provides 3591.84 counts per revolution of the gearbox’s output shaft. The gearmotor is cylindrical, with a diameter just under 25 mm, and the D-shaped output shaft is 4 mm in diameter and extends 12.5 mm from the face plate of the gearbox. This gearmotor is also available without an encoder.
Key specifications:
| voltage | no-load performance | stall extrapolation |
|---|---|---|
| 12 V | 100 RPM, 200 mA | 9 kg⋅cm (125 oz⋅in), 2.1 A |
| Pololu item #: 3231 | |
| Brand: Pololu | |
| Status: Active and Preferred | |
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Free shipping in USA
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This gearmotor consists of a medium-power, 12 V brushed DC motor combined with a 98.78:1 metal spur gearbox. The gearmotor is cylindrical, with a diameter just under 25 mm, and the D-shaped output shaft is 4 mm in diameter and extends 12.5 mm from the face plate of the gearbox. This gearmotor is also available with an integrated encoder.
Key specifications:
| voltage | no-load performance | stall extrapolation |
|---|---|---|
| 12 V | 76 RPM, 200 mA | 12 kg⋅cm (165 oz⋅in), 2.1 A |
| Pololu item #: 4867 | |
| Brand: Pololu | |
| Status: Active and Preferred | |
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Free shipping in USA
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This gearmotor consists of a medium-power, 12 V brushed DC motor combined with a 98.78:1 metal spur gearbox, and it has an integrated 48 CPR quadrature encoder on the motor shaft, which provides 4741.44 counts per revolution of the gearbox’s output shaft. The gearmotor is cylindrical, with a diameter just under 25 mm, and the D-shaped output shaft is 4 mm in diameter and extends 12.5 mm from the face plate of the gearbox. This gearmotor is also available without an encoder.
Key specifications:
| voltage | no-load performance | stall extrapolation |
|---|---|---|
| 12 V | 76 RPM, 200 mA | 12 kg⋅cm (165 oz⋅in), 2.1 A |
| Pololu item #: 3232 | |
| Brand: Pololu | |
| Status: Active and Preferred | |
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Free shipping in USA
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This gearmotor consists of a medium-power, 12 V brushed DC motor combined with a 171.79:1 metal spur gearbox. The gearmotor is cylindrical, with a diameter just under 25 mm, and the D-shaped output shaft is 4 mm in diameter and extends 12.5 mm from the face plate of the gearbox. This gearmotor is also available with an integrated encoder.
Key specifications:
| voltage | no-load performance | stall extrapolation |
|---|---|---|
| 12 V | 43 RPM, 200 mA | 18 kg⋅cm (250 oz⋅in), 2.1 A |
| Pololu item #: 4868 | |
| Brand: Pololu | |
| Status: Active and Preferred | |
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Free shipping in USA
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This gearmotor consists of a medium-power, 12 V brushed DC motor combined with a 171.79:1 metal spur gearbox, and it has an integrated 48 CPR quadrature encoder on the motor shaft, which provides 8245.92 counts per revolution of the gearbox’s output shaft. The gearmotor is cylindrical, with a diameter just under 25 mm, and the D-shaped output shaft is 4 mm in diameter and extends 12.5 mm from the face plate of the gearbox. This gearmotor is also available without an encoder.
Key specifications:
| voltage | no-load performance | stall extrapolation |
|---|---|---|
| 12 V | 43 RPM, 200 mA | 18 kg⋅cm (250 oz⋅in), 2.1 A |
| Pololu item #: 3233 | |
| Brand: Pololu | |
| Status: Active and Preferred | |
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Free shipping in USA
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This gearmotor consists of a medium-power, 12 V brushed DC motor combined with a 226.76:1 metal spur gearbox. The gearmotor is cylindrical, with a diameter just under 25 mm, and the D-shaped output shaft is 4 mm in diameter and extends 12.5 mm from the face plate of the gearbox. This gearmotor is also available with an integrated encoder.
Key specifications:
| voltage | no-load performance | stall extrapolation |
|---|---|---|
| 12 V | 33 RPM, 200 mA | 23 kg⋅cm (320 oz⋅in), 2.1 A |
| Pololu item #: 4869 | |
| Brand: Pololu | |
| Status: Active and Preferred | |
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Free shipping in USA
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This gearmotor consists of a medium-power, 12 V brushed DC motor combined with a 226.76:1 metal spur gearbox, and it has an integrated 48 CPR quadrature encoder on the motor shaft, which provides 10,884.47 counts per revolution of the gearbox’s output shaft. The gearmotor is cylindrical, with a diameter just under 25 mm, and the D-shaped output shaft is 4 mm in diameter and extends 12.5 mm from the face plate of the gearbox. This gearmotor is also available without an encoder.
Key specifications:
| voltage | no-load performance | stall extrapolation |
|---|---|---|
| 12 V | 33 RPM, 200 mA | 23 kg⋅cm (320 oz⋅in), 2.1 A |
| Pololu item #: 4860 | |
| Brand: Pololu | |
| Status: Active and Preferred | |
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Free shipping in USA
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This is the motor and encoder portion of our medium-power (HP), 12V 25D mm metal gearmotors with 48 CPR encoders. It does not include a gearbox, but the pinion gear on the output shaft works with all of our 25D mm gearmotor gearboxes, so this can be used as a replacement motor or encoder for those gearboxes.
Key specifications:
| voltage | no-load performance | stall extrapolation |
|---|---|---|
| 12 V | 7800 RPM, 50 mA | 0.2 kg⋅cm (2.7 oz⋅in), 2.1 A |
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