These universal mounting hubs are designed to work with most 5 mm diameter shafts, including round shafts and “D” shafts, such as those on our stepper motors. Each of the two included hubs has four mounting holes for M3 screws  (not included), letting you mount custom wheels or mechanisms to your motors. The two included M3 hex set screws (one for each hub) allow secure coupling of shaft to hub, and a 1.5 mm hex wrench is included for use with the set screws. A dimension diagram of the hub is available under the resources tab.

These hubs will work with most of our stepper motors (the ones with 5 mm shafts), 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.


Size: 19 mm diameter × 5 mm thick
Weight: 3.2 g
Shaft diameter: 5 mm
Mounting hole size: M3


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

1998 - Pololu Universal Aluminum Mounting Hub for 5mm Shaft, M3 Holes (2-Pack)

  • Brand: Pololu
  • Product Code:ES001798
  • Availability:In Stock
  • 7.49€