73:1 Metal Gearmotor 20Dx42L mm (Short Output Shaft)
These small brushed DC gearmotors can deliver a lot of power for their size. This version has a 6V brushed DC motor combined with a 73:1 metal spur gearbox. The gearmotor is cylindrical with a diameter of 20 mm, and the D-shaped output shaft is 4 mm in diameter and extends 10.7 mm from the face plate of the gearbox.
Key specs at 6 V: 180 RPM and 250 mA free-run, 60 oz-in (4.3 kg-cm) and 3.2 A stall.
Note: This gearmotor is being replaced by a new version with a slightly different gear ratio and a longer output shaft (the motor portion is unchanged). This short-shaft version will be discontinued when the remaining stock is gone.
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Pololu 20D mm gearmotor with bracket and hub.
White Pololu 60×8mm wheel on a Pololu 20D mm metal gearmotor.
Dagu Wild Thumper wheel 120×60mm (metallic red) with Pololu 20D mm metal gearmotor.
Dimensions of the original Pololu 20D mm metal gearmotors with shorter output shafts. Units are mm over [inches]. This diagram only applies to the listed gear ratios.