Universal Aluminum Mounting Hub for 3mm Shaft Pair

The Pololu universal aluminum mounting hub allows you to mount custom wheels and mechanisms to 3 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.

These universal mounting hubs are designed to work with most 3 mm shafts, including round shafts, “D” shafts, and Tamiya’s 3 mm hexagonal shafts. Each hub has four mounting holes for 2-56 screws, 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. The included set screws require a 0.05" hex wrench (often the smallest size in SAE Allen wrench sets).

Pictured is a hub with one of Pololu’s mini gearmotors and a Pololu mini metal gearmotor bracket. (motor and bracket not included)