73:1 Metal Gearmotor 20Dx42L mm
 

This 1.67" x 0.79" x 0.79" gearmotor is a brushed DC motor with 73:1 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.
This gearmotor is a replacement for the now-discontinued 67:1 version.

Key specs at 6 V: 180 RPM and 250 mA free-run, 60 oz-in
(4.3 kg-cm) and 3.3 A stall.
 

Gearmotor Dimensions

The 20D mm line of brushed DC gearmotors are available in three different gear ratios,
all of which have the same dimensions except for the length of the gearbox.
The gearmotor face plate has two mounting holes threaded for M2.5 screws,
and you can use our custom-designed 20D mm metal gearmotor bracket (shown in the left picture below)
to mount the gearmotor to your project via these mounting holes and the screws that come with the bracket.
 

This gearmotor has an output shaft with a diameter of 4 m; 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 also works directly with the 120mm-diameter Wild Thumper wheels, as shown below.
 

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