Pololu 172:1 Metal Gearmotor 25Dx56L mm HP 6V

This gearmotor consists of a high-power, 6 V brushed DC motor combined with a 171.79:1 metal spur gearbox. The gearmotor is cylindrical, with a diameter just under 25 mm, and the D-shaped output shaft is 4 mm in diameter and extends 12.5 mm from the face plate of the gearbox. This gearmotor is also available with an integrated encoder (Pololu 4808).Key specifications: voltage no-load performance stall extrapolation 6 V 56 RPM (rotations per minute), 550 mA 25 kg⋅cm (350 oz⋅in), 6.5 A