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The Pololu 57×76mm Unipolar/Bipolar Stepper Motor is a powerful, high-torque, four-phase, unipolar/bipolar stepper motor. It has a 57mm body length and a 76mm body diameter, making it an ideal size for a wide range of applications. The motor features a 0.6400 ohm coil resistance per phase, a 1.8deg step angle, and a 0.67A maximum current per phase. Its motor shaft has a 3mm diameter and it is threaded over 6mm of its length, making it capable of coupling with standard screws. Additionally, the motor includes a 400mH inductance and a built-in overcurrent protection. This stepper motor is ideal for a variety of applications such as industrial automation, robotics, 3D printing and more.