25:1 Metal Gearmotor 20Dx44L mm

25:1 Metal Gearmotor 20Dx44L mm
Pololu item #: 1092 0 in stock

This product has been discontinued.

This 1.71" 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.

Key specs at 6 V: 500 RPM and 250 mA free-run, 20 oz-in (1.5 kg-cm) and 3.3 A stall.

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Note: This product has been replaced by a versions with slightly different gearboxes: 29:1 Metal Gearmotor 20Dx41L mm and 73:1 Metal Gearmotor 20Dx42L mm

Gearmotor Dimensions

The face plate has two mounting holes threaded for M2.5 screws. You can use our custom-designed 20D mm metal gearmotor bracket (shown in the left picture below) to mount the 67:1 and 25:1 versions of this gearmotor to your project via these mounting holes and the screws that come with the bracket.

Pololu 20D mm gearmotor with bracket and hub.
White Pololu 60×8mm wheel on a Pololu 20D mm metal gearmotor.

Please note that the 20D 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 our larger Pololu wheels (60mm-, 70mm-, 80mm-, and 90mm-diameter) or custom wheels and mechanisms to the gearmotor’s output shaft (see the right picture above). The gearbox’s output shaft works directly with the 120mm-diameter Wild Thumper wheels, as shown below.

Dagu Wild Thumper wheel 120×60mm (metallic red) with Pololu 20D mm metal gearmotor.

Dimension Diagram for the 25:1 and 67:1 versions

The picture below shows the dimensions (in mm) of the 25:1 and 67:1 versions of our 20D mm line of gearmotors. The value of X is 18.5 mm for the 25:1 20Dx44L mm version and 20 mm for the 67:1 20Dx45L mm version

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.

Note: 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.

Selecting the Right Gearmotor

We offer a wide selection of metal gearmotors that offer different combinations of speed and torque. Our metal gearmotor comparison table can help you find the motor that best meets your project’s requirements.

Some of the Pololu metal gearmotors.

People often buy this product together with:

Pololu Bracket Pair for Discontinued 25:1 and 67:1 Metal Gearmotors 20D mm Pololu Bracket Pair for Discontinued 25:1 and 67:1 Metal Gearmotors 20D mm
Pololu Universal Aluminum Mounting Hub for 4mm Shaft, #4-40 Holes (2-Pack) Pololu Universal Aluminum Mounting Hub for 4mm Shaft, #4-40 Holes (2-Pack)
35:1 Mini Metal Gearmotor 35:1 Mini Metal Gearmotor