Pololu Universal Aluminum Mounting Hub, M3 Holes (2-Pack)

These universal aluminum mounting hubs allow you to mount custom wheels and mechanisms to various diameter motor shafts.

The set includes two hubs, two M3 set screws for securing the hubs to motor shafts, and one 1.5 mm Allen wrench for use with the set screws. Each hub has four threaded mounting holes for M3 screws (not included).

These universal mounting hubs are designed to work with most diameter shafts, including round shafts and “D” shafts. 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.

Dimensions

Dimensional Drawing	3mm	4mm	5mm	6mm	8mm
Diameter	17.5mm	19mm	19mm	25.4mm	25.4mm
Thickness	5mm	5mm	5mm	9.2mm	9.2mm
Weight1	2.8g	3.2g	3.2g	6.8g	6.7g
Mounting Hole Size2	M3	M3	M3	M3	M3

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