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The Pololu universal aluminium 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. 
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, 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 that we also stock if you need one. This is often the smallest size in SAE Allen wrench sets. 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.
Mechanical drawing for the Pololu universal aluminum mounting hub for 4 mm shaft. File downloads
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