Pololu Universal Aluminium Mounting Hub (4mm Shaft) Pair, M3 Holes
The Pololu universal aluminum mounting hub allows you to mount custom wheels and mechanisms to 4 mm 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 4 mm 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.