This is one of the most popular Nema 23 stepper motor, it with step angle 1.8deg and size 57x57x76mm. It has 4 wires, each phase draws 3A, with holding torque 1.9Nm (269oz.in).
Manufacturer Part Number: 23HS30-3004S
Motor Type: Bipolar Stepper
Step Angle: 1.8 deg
Holding Torque: 1.9N..