131:1 Metal Gearmotor 37Dx57L mm (Helical pinion)
This gearmotor is a powerful brushed DC motor with 131.25:1 metal gearbox intended for operation at 12 V. The gearbox is composed mainly of spur gears, but it features helical gears for the first stage for reduced noise and improved efficiency. These units have a 16 mm-long, 6 mm-diameter D-shaped output shaft.
No-load performance: 76 RPM, 150 mA
Stall extrapolation: 45 kg⋅cm (630 oz⋅in), 5.5 A