[Rapt0r9]

The specifications state that the motors have a stall torque @ 6V of 57 oz·in. This means that the motor can move a load of 57 oz in a one inch radius circle about its shaft.

For a practical explanation, look at it like this. You place an arm on the motor. This arm has no weight (for the sake of example) and is one inch long from the attachment point to the motor's shaft to the end of the arm. The arm will then be able to lift 57 ounces at its end. Obviously the mass of the arm and torque loss through gearing need to be taken into consideration, but this is the basic idea.

You can also transform the torque value. Something like 57 oz/in would also be 28.5 oz/2in or 19oz/3in and so on. Always try to keep a buffer when looking at the torque ratings of motors. I usually look for the motor and gear box to be at least 10% more than my worst case scenario.

Hope this helps.