These are some awesome motors for your Beetleweight (3 pound) robot, or for a steroid-powered Antweight. Also great for applications that require high-torque lifting or movements of arms, etc.

For circumstances where you need MAXIMUM torque, this 231:1 gear reduction will be nearly impossible to stop!

All-metal planetary gearbox with metal gears.

Check out these numbers:

	B231 model
	6V	12V
No load speed	40rpm	70rpm
Amps @ nominal	0.3 A	0.4 A
Stall current	3.0 A	6.8 A
Stall torque	225 oz-in	370 oz-in
Gear ratio	231:1
Weight	3.53 oz
Diameter	0.86"
Length	2.25"
Shaft diameter	4 mm - with flat
Shaft length	11 mm

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5/7/2009 Michael	nice company to deal with I ordered several Gearmotors. All products were excellent, shipped on time and performed per spec. I will continue to purchase product, as needed, from the Robot Marketplace.