20.4:1 Metal Gearmotor 25Dx50L mm HP

This cylindrical, 1.97" x 0.98" x 0.98" gearmotor uses a brushed
DC motor with extra-strong magnets and a 20.4:1 metal gearbox to deliver a lot of power in a relatively small package.
These units have a 0.315"-long, 4 mm-diameter D-shaped output shaft. We also carry a lower-power version of this gearmotor.

Key specs at 6 V: 480 RPM and 450 mA free-run, 36 oz-in (2.6 kg-cm) and 6 A stall.
 

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, though they can begin rotating at voltages as low as 1 V.
Higher voltages could start negatively affecting the life of the motor.

These 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 left picture below).
These are the same type of motors used in the Wild Thumper all-terrain chassis,
and the gearbox’s output shaft works directly with the 120mm-diameter Wild Thumper wheels.
 

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