Pololu 156:1 Metal Gearmotor 20Dx44L mm 12V CB

These small brushed DC gearmotors can deliver a lot of power for their size. This version has a 12V brushed DC motor with long-life carbon brushes combined with a 156.3:1 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 18 mm from the face plate of the gearbox.

Note: the gearbox torque limit is 70 oz-in (5 kg-cm); see detailed description for important product limitations.