Note: This type of DC motor requires a controller to function. We have some inexpensive controllers and servo testers designed for use with remote control model cars and aircraft that can be used to operate this motor. See notes on controllers (CAT# sc-112, sc-120) and servo testers (CAT# STR-110) for more information.
Spec sheet available in PDF format.
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Very High Quality Combination -- Amazing Torque! 
This is a superb motor & gearbox combination, and for only $30 it's one of the best deals I've ever seen from A.E. I agree with the previous reviewer, each of these must have cost several hundred dollars originally. The motor (CAT# DCM-459) is a true professional-quality product for serious industrial and scientific applications. The gearbox is of equal quality, very quiet, heavy-duty internals, flawless machining. ABSOLUTELY NO BACKLASH! Take it from an engineer -- that's hard to do.
This thing has incredible torque! Out of curiosity, I put a long 10mm wrench on the shaft, and tried to stall the motor. No matter how hard I tried, it was no contest, and the motor only peaked @ 3.1A during this heroic arm-wrestling match. Crude, but informative. I'm now using these to power a 150 lb stair-climbing robot.
Couple notes: My gearboxes don't have the protruding dowel pins shown in the photo on either side of the output. Also, I had to try 5 different ESCs before I found one that worked with this motor. The others all had problems starting the motor from a stop. An ESC with sensor inputs (used in large R/C cars) probably would solve this issue.
Very high quality BLDC motor & gearbox
I bought a bunch of the DCM-459, and use a Roboteq MLB 1660 controller for testing. This motor with gearbox runs 8 RPM on 12v, and is used here:
https://vimeo.com/15537820. The output bearing is a hefty roller bearing that will support quite a lot. Ball bearings for all others. Very nice low RPM drive for dampers, spotlights, cameras, except that you need the driver. Here is a nice board that uses the MC33033 chip set, but needs some jumpers or PIC programming for $17.67:
http://www.ebay.com/itm/BLDC-Power-3-Phase-Servo-Motor-Driver-Hall-Effect-MC33033-MC33039-PIC16F873A-/271582181158?pt=LH_DefaultDomain_0&hash=item3f3b8f3726
This must have cost many, many hundreds of dollars new
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