This bipolar Nema 17 stepper motor is one of the most popular models, with a step angle of 1.8deg and size 42x42x34mm. It has four wires, and each phase draws a current of 0.4A at 12V, with a holding torque 26Ncm (36.8oz. in).
Stepper Motor 12V Nema 17 Bipolar for 3D Printer DIY CNC
