These universal mounting hubs are designed to work with most 6 mm diameter shafts, including round shafts and “D” shafts. Each of the two included hubs has six mounting holes for #4-40 screws (not included), letting you mount custom wheels or mechanisms to your motors. The four included #4-40 hex set screws (two 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 Pololu’s 19:1 metal gearmotor 37Dx52L mm and a Pololu stamped aluminum L-bracket for 37D mm metal gearmotors. These hubs will work with any of our 37D mm metal gearmotors, and they also work with 80 mm and 90 mm Pololu wheels.

37D mm gearmotor with L-bracket and 6mm universal mounting hub.

Black Pololu 90×10mm wheel on a Pololu 37D mm metal gearmotor.



Size: 25.4 mm diameter × 9.2 mm thick
Weight: 6.8 g1
Shaft diameter: 6 mm
Mounting hole size: #4-402


For a single hub only (without set screws).
This is also the size of the set screws.


File downloads

Pololu universal aluminum mounting hub for 6mm shaft, #4-40 holes mechanical drawing (47k pdf)
Printable mechanical drawing for the Pololu universal aluminum mounting hub for 6mm shaft, #4-40 holes.
3D model of Pololu Universal Aluminum Mounting Hub for 6mm Shaft, #4-40 Holes (1MB step)


SKU PL-1083
Brand Pololu

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