172:1 Metal Gearmotor 25Dx56L mm HP
 

This cylindrical, 2.2" x 0.98" x 0.98" gearmotor uses a brushed DC motor with
extra-strong magnets and a 172:1 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: 57 RPM and 450 mA free-run, 260 oz-in
(18.7 kg-cm)
and 6 A stall.
(Note: stall torque and current specifications are theoretical values; stalling the motor is likely to damage the gearbox.)

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.
 

The face plate has two mounting holes threaded for M3 screws.
You can use our custom-designed 25D mm metal gearmotor bracket
(shown in the picture below) to mount the gearmotor to your project
via these mounting holes and the screws that come with the bracket.
 

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