These small brushed Pololu20D DC gearmotors can deliver a lot of power for their size. This version has a 12Vbrushed DC motor withlong-life carbon brushescombined with a25:1metal spur gearbox. The gearmotor is cylindrical with a diameter of 20mm, and the D-shaped output shaft is 4mm in diameter and extends 18mm from the faceplate of the gearbox.

In general, these kinds of motors can run at voltages above and below their nominal voltages; lower voltages might not be practical, and higher voltages could start negatively affecting the life of the motor. This motor will run at 6V but is intended for operation at 12V.

We also stock 100:1 and 250:1 versions of this motor.

Note:Stalling or overloading gearmotors can greatly decrease their lifetimes and even result in immediate damage. In order to avoid damaging the gearbox, we recommend keeping continuously applied loads under 5 kg-cm (75 oz-in). Stalls can also result in rapid (potentially on the order of seconds) thermal damage to the motor windings and brushes, especially for motors like this that can deliver a lot of power for their size; a general recommendation for brushed DC motors is to limit continuous current to approximately 25% of the stall current.

Specifications

Performance at Maximum Efficiency

Resources

• Datasheet for Pololu 20D Metal gearmotors
• Dimension Diagrams for Pololu 20D Metal gearmotors
• 3D Models of Pololu 20D Gearmotors

Dimensions

The downloadable diagram shows the dimensions of the 20Dmm line of metal gearmotors (units are mm over [inches]).

Warning:Do not screw too far into the mounting holes as the screws can hit the gears. We recommend screwing no more than 3.5mm (0.14) into the M2.5 mounting holes.

Gearmotor accessories

• Gearmotor Face Plate – The gearmotor face plate has two mounting holes threaded for M2.5 screws, and you can use our custom-designed20Dmm metal gearmotor bracket to mount the gearmotor to your project via these mounting holes and the screws that come with the bracket.

• Universal Mounting Hubs – The 4mm diameter gearbox output shaft works withPololu universal aluminum mounting hub for 4mm shafts, which can be used to mount our largerPololu wheels(60mm-, 70mm-, 80mm-, and 90mm-diameter) or custom wheels and mechanisms to the gearmotors output shaft.

• Scooter Wheel Adaptors – You can use our4mm scooter wheel adaptersto mount many common skateboard, inline skate or scooter wheels to the gearmotors output shaft.

• 12mm Hex Wheel Adapter – For a general-purpose hex adapter, consider our12mm hex wheel adapter, which lets you use this motor with many common hobby RC wheels.

• Wild Thumper Wheels – These motors also work with the hex adapters included with the 120mm-diameterWild Thumper wheels