Pololu 12V, 500 RPM, 5 kg-cm,19:1 Gear Motor

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This 2.05″ × 1.45″ × 1.45″gearmotor is a powerful brushed DC motor with 19:1 metal gearbox intended for operation at 12 V. These units have a 0.61″-long, 6 mm-diameter D-shaped output shaft. This gearmotor is also available with an integrated encoder.
Key specs at 12 V: 500 RPM and 300 mA free-run, 84 oz-in (5 kg-cm) and 5 A stall.