1596-POLOLU 1000:1 Micro Metal Gearmotor LP 6V
This gearmotor is a miniature low-power, 6 V brushed DC motor with a 986.41:1 metal gearbox, making it a great choice for applications requiring fine control at very low speeds. 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 6Â V: 14Â RPM and 40Â mA with no load, 70Â oz-in (5Â kg-cm) and 0.36Â A at stall. (Note: stall torque and current specifications are theoretical values; stalling the motor will damage the gearbox.)