156:1 Metal Gearmotor 20Dx44L mm 6V with Extended Motor Shaft Pololu 3468

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 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. This version also has a 6 × 2 mm extended motor shaft.

Key specs at 6 V: 90 RPM and 200 mA free-run, 110 oz-in (8 kg-cm) and 3.2 A stall.

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Price: 27.62 from Bol.com