1/4″ Pololu universal aluminum mounting hub on a NEMA 23 stepper motor with 1/4″-diameter output shaft.

These universal mounting hubs are designed to work with most 0.250 inch (6.35 mm) shafts, including round shafts and “D” shafts, such as those on our NEMA 23 stepper motors. Each of the two included hubs has six mounting holes for M3 screws (not included), letting you mount custom wheels or mechanisms to your motors. The four included M3 hex set screws (two 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 our NEMA 23 stepper motors, and they also work with 80 mm and 90 mm Pololu wheels.



Size: 25.4 mm diameter × 9.2 mm thick
Weight: 6.7 g1
Shaft diameter: 0.250 in
Mounting hole size: M32


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 0.250″ shaft, M3 holes mechanical drawing (69k PDF)
Printable mechanical drawing for the Pololu universal aluminum mounting hub for 1/4 inch shaft, M3 holes.
3D model of Pololu Universal Aluminum Mounting Hub for 1/4″ Shaft, M3 Holes (1MB step)


SKU PL-1994
Brand Pololu

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