391:1 Metal Gearmotor 20Dx46L mm 6V CB
These small brushed DC gearmotors can deliver a lot of power for their size. This version has a 6V brushed DC motor with long-life carbon brushes combined with a 390.6:1 metal spur gearbox. The gearmotor is cylindrical with a diameter of 20 mm, and the D-shaped output shaft is 4 mm in diameter and extends 18 mm from the face plate of the gearbox.
Key specs at 6 V: 37 RPM and 170 mA with no load, 260 oz-in (19 kg-cm) and 2.9 A at stall. Note: the gearbox torque limit is 70 oz-in (5 kg-cm); see detailed description for important product limitations.
Alternatives available with variations in these parameter(s): gear ratio motor type extended motor shaft?
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- Dimension diagram for the Pololu 20D mm metal gearmotors (99k pdf)
- 3D models of 20D mm gearmotors (3MB zip)
- This file contains 3D models (in the step file format) of the 20D mm gearmotors. Note: these models only accurately represent our newer versions with 18mm-long output shafts; they are not accurate representations of the older versions with shorter output shafts (i.e. gear ratios 29:1, 56:1, 73:1, and 154:1).