Pololu Universal Aluminium Mounting Hub (4mm Shaft) Pair, 4-40 Holes
The Pololu universal aluminum mounting hub allows you to mount custom wheels and mechanisms to 4 mm motor shafts.
The hubs are sold in pairs, and each hub includes one 4-40 set screw for securing a motor shaft to the hub.
The set includes one Allen wrench and two 4-40 set screws for securing the hubs to motor shafts.
These universal mounting hubs are designed to work with most 4 mm shafts, including round shafts, and “D” shafts.
Each hub has four mounting holes for 4-40 screws (not included), letting you mount custom wheels or mechanisms to your motors. 4-40 hex set screws (one included for each hub) allow secure coupling of shaft to hub.
A 0.05" hex wrench (often the smallest size in SAE Allen wrench sets) is included for use with the set screws.