Pololu Universal Aluminium Mounting Hub for 6mm Shafts – #4-40 Holes (2-Pack)

We have an assortment of universal mounting hubs available, spanning several shaft sizes and featuring mounting holes threaded for metric or imperial screws. These universal mounting hubs are designed to work with most 6mm diameter shafts, including round shafts and “D” shafts.

Each of the two included hubs has six mounting holes for #4-40 screws (not included), letting you mount custom wheels or mechanisms to your motors. The four included #4-40 hex set screws (two for each hub) allow secure coupling of shaft to hub, with the longer set screws intended for the deeper of the two set screw holes. A 0.05″ hex wrench (often the smallest size in SAE Allen wrench sets) is included for use with the set screws.

The product images show a hub with Pololu’s 19:1 metal gearmotor 37Dx52L and a Pololu stamped aluminium L-bracket for 37D metal gearmotors. These hubs will work with any 37D mm metal gearmotors, and they also work with 80mm, and 90mm Pololu wheels.

Specifications

• Size: 25.4mm mm diameter × 9.2 mm thick
• Weight: 6.8g*
• Shaft diameter: 6mm
• Mounting hole size: #4-40**

*For a single hub only (without set screw)
**This is also the size of the set screws