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.
Key specs at 12 V: 90 RPM and 90 mA with no-load, 9.5 kg-cm and 1.6 A at stall. Note: the gearbox torque limit is 5 kg-cm