3042-POLOLU 150:1 Micro Metal Gearmotor HPCB 12V
This gearmotor is a miniature high-power, 12 V brushed DC motor with long-life carbon brushes and a 150.58:1 metal gearbox. It has a cross section of 10 × 12 mm, and the D-shaped gearbox output shaft is 9 mm long and 3 mm in diameter.
Key specs at 12 V: 200 RPM and 100 mA with no load, 40 oz-in (2.9 kg-cm) and 0.8 A at stall.