I can't seem to find any torque specs for this particular motor.
However, I did find that it has 6 wires. This means it's a Unipolar motor, and generally you'll need a Unipolar driver. However, refer to this link:
And you are able to wire 6-Wire Unipolar motors as Bipolar in 2 different configurations; Half-Coil and Series. Half-coil will not change the specifications of the motor. However, Series will. The resistance will double, the motor's inductance will quadruple, and the voltage required will increase by a factor of 1.414; the required current needed however, will drop down to 70% of it's usual rating, and the torque will increase by a factor of 1.414.
Hope this was helpful.