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120:1 Mini Plastic Gearmotor HP, Offset 3mm D-Shaft Output

High-power brushed DC motor, 120:1 reduction gearbox, intended for operation at 4.5 V, 9.7mm-long gearbox, 3 mm-diameter D-shaped output shaft that is offset from but parallel to the motor shaft, built-in safety clutch. Pololu 1512

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ID: 561578

5,32€ gross (23% VAT)
4,32€ net

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Data sheet

DC motor powerHP
Gear materialPlastic
Gear ratio120:1
Rotation speed150RPM
Shaft diameter3 mm
Shaft shapeD
Obustronny wał silnikaNie
Power supply voltage4.5V

More info


This compact, inexpensive plastic gearmotor (high-power brushed DC motor with a 120:1 reduction gearbox) is well suited for use in small robots. While intended for operation at 4.5 V, it should run comfortably in the 3 V to 6 V range. The gearbox has a 9.7mm-long, 3 mm-diameter D-shaped output shaft that is offset from but parallel to the motor shaft, and a built-in safety clutch helps protect the gears from excessive loads.

Key specs at 4.5 V: 150 RPM and 130 mA free-run, 25 oz-in (1.8 kg-cm) and 1.25 A stall.

These brushed DC gearmotors are compact and affordable — perfect for building a quick, miniature robot. They are intended for use at 4.5 V, though in general, these kinds of motors can run at voltages above and below this nominal voltage, so they should operate comfortably in the 3 V to 6 V range (rotation can start at voltages as low as 0.5 V). Lower voltages might not be practical, and higher voltages could start negatively affecting the life of the motor. The plastic gearbox is protected by a built-in safety clutch that will typically slip before the gear teeth can shear (typically when the load exceeds around 25 oz-in, or 2 kg-cm).

The mini plastic gearmotor family offers two output shaft orientations relative to the motor shaft (offset and 90°), two motor options (normal and high-power, or HP for short), and two gearbox options (120:1 and 180:1). The 120:1 versions are white and the 180:1 versions are yellow.


  • Shaft type: offset 3mm D
  • Typical operating voltage: 4.5 V
  • Gear ratio: 120:1
  • Free-run speed @ 4.5V: 150 rpm
  • Free-run current @ 4.5V: 130 mA
  • Stall current @ 4.5V: 1250 mA
  • Stall torque @ 4.5V: 25 oz·in (note: the gearbox's built-in clutch might start slipping at a lower torque)
  • Extended motor shaft?: NO
  • Size: 36.5 x 20 x 27.4 mm
  • Weight: 19 g
  • Shaft diameter: 3 mm D shaft