Universal Aluminum Mounting Hub for 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.
Each hub has four mounting holes for 4-40 screws (not included).
 

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.

The picture to the right shows a hub with Pololu’s 25:1 metal gearmotor 20Dx44L mm and a Pololu 20D mm metal gearmotor bracket.
This hub will work with any Pololu 20D mm metal gearmotor.
 

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