Mini gearmotor with bracket and hub.

These universal mounting hubs are designed to work with most 3 mm diameter shafts, including round shafts, “D” shafts, and Tamiya’s 3 mm hexagonal shafts. Each of the two included hubs has four mounting holes for #2-56 screws (not included), letting you mount custom wheels or mechanisms to your motors. The two included #4-40 hex set screws (one for each hub) allow secure coupling of shaft to hub, and a 0.05″ hex wrench (often the smallest size in SAE Allen wrench sets) is included for use with the set screws. A dimension diagram of the hub is available under the resources tab.

The picture to the right shows a hub with one of Pololu’s mini metal gearmotors and a Pololu mini metal gearmotor bracket. These hubs will work with any Pololu mini/15.5D mm metal gearmotor or micro metal gearmotor, and they also work with 60 mm, 70 mm, 80 mm, and 90 mm Pololu wheels.

Pololu wheels with 90, 80, 70, and 60mm diameters in three colors: blue, red, and yellow.


Specifications

Dimensions

Size: 17.5 mm diameter × 5 mm thick
Weight: 2.8 g1
Shaft diameter: 3 mm
Mounting hole size: #2-562

Notes:

1
For a single hub only (without set screw).
2
The set screw is #4-40.

Resources

File downloads

Pololu universal aluminum mounting hub for 3mm shaft, #2-56 holes mechanical drawing (32k pdf)
Printable mechanical drawing for the Pololu universal aluminum mounting hub for 3mm shaft, #2-56 holes.
3D model of Pololu Universal Aluminum Mounting Hub for 3mm Shaft, #2-56 Holes (1MB step)

(PL-1079)

SKU PL-1079
Brand Pololu

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