This gearmotor is a miniature (24mm x 10mm x 12mm), high-quality, high-power motor with 10:1 metal gearbox, similar to Sanyo’s popular 12 mm gearmotors.
These units have a 9.27mm long, 3 mm-diameter D-shaped output shaft, and the brass faceplate has two mounting holes threaded for M1.6 screws (1.6 mm diameter, 0.35 mm thread pitch).
Key specs at 6 V: 3000 RPM and 120 mA free-run, 4 oz-in (0.3 kg-cm) and 1.6 A stall.
These tiny, high-quality motors are intended for use at 6 V, though in general, these kinds of motors can run at voltages above and below this nominal voltage, so they should comfortably operate in the 3 – 9 V range (rotation can start at voltages as low as 0.5 V).
Lower voltages might not be practical, and higher voltages could start negatively affecting the life of the motor.
Free-run speed @ 6V: 3000 rpm
Free-run current @ 6V: 120 mA
Stall current @ 6V: 1600 mA
Stall torque @ 6V: 4 oz·in