The Stepper Motor 3.71:1-139:1 Ratio NEMA17 42BYG, with a compact 40mm diameter and 48mm body length, combines precision and efficiency. Its high-quality construction ensures long-lasting operation, even under heavy duty use. The gearbox, with a range of 48mm, provides smooth and quiet operation, ideal for applications requiring precise and controlled movement. This stepper motor features a unique planetary gear stepping system, offering precise positioning and rotational control. Its 3.7:1 gear ratio ensures smooth and efficient motion, making it an ideal choice for a wide range of applications, from robotics and automation to industrial control and material handling. With its compact size and high-performance features, the 42BYG Stepper Motor is a versatile and reliable addition to any machine.