250:1 Micro Metal Gearmotor MP 6V
This gearmotor is a miniature medium-power, 6 V brushed DC motor with a 248.98:1 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 6 V: 90 RPM and 40 mA with no load, 41 oz-in (3.0 kg-cm) and 0.7 A at stall.
Please see the micro metal gearmotor datasheet (2MB pdf) for more information, including detailed performance graphs for each micro metal gearmotor version.