This stepping motor has a large frame size and torque and can be used where a great amount of weight is carried and where high load against the motor turning direction is present. Wiring: Red to A+, Green to A-, Yellow to B+ and Blue to B-. Datasheet for wiring and electrical specifications
Here is the torque curve graph for the NEMA 34 651 oz-in stepper motor. The graph considers torque and pps, pulses per second. The voltage applied for this graph is 48 volts and 5.4 amps per phase.