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22,96 €*

This gearmotor is a miniature medium-power brushed DC motor with a 986.41:1 metal gearbox, making it a great choice for applications requiring fine control at very low speeds. It has a cross section of 10 × 12 mm, and the D-shaped gearbox output shaft is 9 mm long and 3 mm in diameter.

Key specs at 6 V: 25 RPM and 40 mA with no load, 80 oz-in (6 kg-cm) and 0.7 A at stall. (Note: stall torque and current specifications are theoretical values; stalling the motor will damage the gearbox.)

Exact gear ratio: 25×34×35×34×34×34×2712×9×12×14×14×14×9986.41:1

These tiny, high-torque gearmotors have the highest gear ratio of any motor we sell, which makes them a great choice for applications that require extremely low motor speeds. With no load, the output shaft turns at approximately 25 RPM at 6 V, and we were able to achieve rotation rates of around 1.5 RPM at 0.5 V on a test unit (note that performance will vary slightly from unit to unit). For a version that can turn even slower, consider the lower-power 1000:1 micro metal gearmotor, which has a no-load rotation rate of approximately 14 RPM at 6 V and close to 1 RPM at around 0.5 V.

Note: Because of the high gear ratio, these motors can generate enough torque to damage themselves, so you should avoid stalling them.

Gearmotor Dimensions

In terms of size, these gearmotors are very similar to Sanyo’s popular 12 mm NA4S DC gearmotors, and gearmotors with this form factor are occasionally referred to as N20 motors. The versions with carbon brushes (HPCB) have slightly different terminal and end-cap dimensions than the versions with precious metal brushes, but all of the other dimensions are identical.

Dimensions of versions with carbon brushes (HPCB)


Dimensions of the Pololu micro metal gearmotors with carbon brushes (HPCB). Units are mm over [inches].


Dimensions of versions with precious metal brushes (low-power, MP, and HP)


Dimensions of the Pololu micro metal gearmotors with precious metal brushes: low-power, medium-power (MP), and high-power (HP). Units are mm over [inches].


These diagrams are also available as a downloadable PDF (262k pdf).