120:1 Mini Plastic Gearmotor, 90º 2mm Spline Output

via Pololu
SKU PL-1123

We have 1 units in our Sydney Warehouse available for immediate dispatch.

We can get a further 159 units in Australia from Pololu. If you order today, we can dispatch this stock between Sep 24, 2020 - Oct 01, 2020.


Pololu mini plastic gearmotor 90 deg. output with opened gearbox.

This brushed DC gearmotor is very compact and weighs only 0.7 ounces (19.5 grams) — perfect for building a quick, miniature robot. The recommended operating voltage range for this motor is 3 to 6 V, though the gearmotor can start rotating at voltages as low as 0.6 V. At 4.5 V, the motor has a free-run current of 80 mA and a stall current of 800 mA; this relatively low current draw makes this a great match for our qik 2s9v1 dual serial motor controller and programmable Orangutan robot controllers. The stall current, torque, and rotation speed will approximately scale linearly with the motor voltage. The gearbox is protected by a built-in safety clutch that will typically slip before gear teeth can shear.

Details for item #1123

Exact gear ratio: ``(22×38×44×26×30) / (10×11×11×22×9) ~~ bb(119.76)``


Dimension diagram of the mini plastic gearmotor with 90° 2mm spline output (units are mm over [in]).

This dimension diagram is also available as a downloadable pdf (75k pdf).

This gearmotor features a splined, chrome-finish output shaft with a 2mm-crest diameter. This shaft can be used with custom wheels or with our adapter for LEGO wheels. The gearbox output shaft is perpendicular to the motor shaft.

Gearmotor Versions

We carry two versions of mini plastic gearmotors with 2 mm diameter spline output shafts, one with an offset shaft and one with a 90° shaft.

We have many more versions of these mini plastic gearmotors available with 3 mm diameter “D”-shaped output shafts (just like the ones on our micro metal gearmotors) that are compatible with many Pololu wheels and our 3 mm universal mounting hubs. These versions offer 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). Additionally, some of these versions are available with an extended motor shaft that protrudes from the rear of the motor by approximately 4.5 mm. This second shaft has a diameter of 1.5 mm and rotates at the same speed as the input to the gearbox, offering a way to add a custom-built encoder to provide motor speed or position feedback. The following table shows all of the mini plastic gearmotors that have 3 mm D-shafts:

Motor Type Stall
@ 4.5 V
@ 4.5 V
Stall Torque
@ 4.5 V

90° output

90° output + motor shaft

offset output

offset output + motor shaft
1250 mA 150 RPM 25 oz-in 120:1 mini HP 120:1 mini HP 120:1 mini HP 120:1 mini HP
low-power 800 mA 120 RPM 20 oz-in 120:1 mini 120:1 mini 120:1 mini 120:1 mini
80 RPM 30 oz-in 180:1 mini
180:1 mini

Note: The stall torque values listed are approximate, and the built-in safety clutch might start slipping at lower torques.