Pololu's compact brushed DC gearmotors pack a punch when it comes to power output. This variant features a 6V brushed DC motor with long-lasting carbon brushes, coupled with a 250:1 metal spur gearbox. The gearmotor is designed in a cylindrical shape with a diameter of 20mm. The D-shaped output shaft, 4mm in diameter, extends 18mm from the gearbox's faceplate. What sets this model apart is its 6x2mm extended motor shaft. Key specifications to note include: operating voltage of 6V, no-load performance of 57 RPM and 150 mA, and a stall extrapolation of 12 kg⋅cm (170 oz⋅in) and 2.9 A. Please note that the gearbox torque limit is 5kg-cm. This gearmotor is ideal for a range of applications where size constraints and power requirements are critical. It can be used in robotics, where the extended motor shaft allows for easy attachment of encoders, wheels, or other accessories. The long-life carbon brushes ensure durability and longevity, making it a cost-effective solution for your projects. What makes this Pololu gearmotor unique is its combination of size, power, and durability. The metal spur gearbox not only provides a high torque output but also ensures the motor's durability and longevity. The extended motor shaft offers additional flexibility for attachments, making it a versatile choice for various applications. The 6V brushed DC motor with long-life carbon brushes ensures efficient performance and longevity. In conclusion, Pololu's 250:1 Metal Gearmotor is an excellent choice for those seeking a small, powerful, and durable motor for their projects. Its unique features and benefits make it stand out in the market, offering a reliable and efficient solution for a wide range of applications.