Key specs at 6 V: 100 RPM and 120 mA with no load, 70 oz-in (5 kg-cm) and 1.6 A at stall.
In general, these kinds of motors can run at voltages above and below their nominal voltages; lower voltages might not be practical, and higher voltages could start negatively affecting the life of the motor.
Almost Exact gear ratio: ~297.92 : 1
In terms of size, these gearmotors are very similar to Sanyo’s popular 12 mm NA4S DC gearmotors, and gearmotors with this form factor are occasionally referred to as N20 motors. The versions with carbon brushes (HPCB) have slightly different terminal and end-cap dimensions than the versions with precious metal brushes, but all of the other dimensions are identical.
Dimensions of the Pololu micro metal gearmotors with carbon brushes (HPCB). Units are mm over [inches].
Dimensions of the Pololu micro metal gearmotors with precious metal brushes: low-power (LP), medium-power (MP), and high-power (HP). Units are mm over [inches].