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.

Key specs at 6V: 56 RPM and 550 mA (max) free-run, 350 oz-in (25 kg-cm) and 6.5 A stall.