If you're looking for a speedy motor with a reasonable amount of torque (for say, moving a small robot that isn't going to fight in a Sumo contest), the GM11a is an excellent candidate. This particular motor has a 9.4mm long, 3mm dia. cylindrical output shaft, pre-ground with a flat spot for secure grub-screw mounting.

Here are the performance measurements:

Running at 3V:

Free running RPM - 181
Free running Current - 28mA
Stall Torque - 5.9 in*oz
Stall Current - 428mA

Running at 6V:

Free running RPM - 370
Free running Current - 42mA
Stall Torque - 6.1 in*oz
Stall Current - 760mA

Documentation ^[Hide]

[Data Sheet]: Solarbotics Gearmotors Specification Summary
[Data Sheet]: GM11a Performance Datasheet PDF (155KB)
[Data Sheet]: GM11a Performance Datasheet PDF (155KB)

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Description ^[Hide]

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