Pololu Universal Aluminum Mounting Hub for 3mm Shaft, #2-56 Holes (2-Pack)

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Pololu item #: 1079
Brand: Pololu
Status: Active and Preferred 
RoHS 3 compliant


These universal aluminum mounting hubs allow you to mount custom wheels and mechanisms to 3 mm diameter motor shafts. The set includes two hubs, two #4-40 set screws for securing the hubs to motor shafts, and one 0.05″ Allen wrench for use with the set screws. Each hub has four threaded mounting holes for #2-56 screws (not included).

We have an assortment of universal mounting hubs available, spanning several shaft sizes and featuring mounting holes threaded for metric or imperial screws:

Alternatives available with variations in these parameter(s): shaft diameter mounting hole size Select variant…

Pictures

Mini gearmotor with bracket and hub.

Mini gearmotor with bracket and hub.




Mini gearmotor with bracket and hub.

These universal mounting hubs are designed to work with most 3 mm diameter shafts, including round shafts, “D” shafts, and Tamiya’s 3 mm hexagonal shafts. Each of the two included hubs has four mounting holes for #2-56 screws (not included), letting you mount custom wheels or mechanisms to your motors. The two included #4-40 hex set screws (one for each hub) allow secure coupling of shaft to hub, and a 0.05″ hex wrench (often the smallest size in SAE Allen wrench sets) is included for use with the set screws. A dimension diagram of the hub is available under the resources tab.

The picture to the right shows a hub with one of Pololu’s mini metal gearmotors and a Pololu mini metal gearmotor bracket. These hubs will work with any Pololu mini/15.5D mm metal gearmotor or micro metal gearmotor, and they also work with 60 mm, 70 mm, 80 mm, and 90 mm Pololu wheels (excluding the Multi-Hub versions; see the individual wheel pages for compatibility details).

Pololu Wheels with 90, 80, 70, and 60 mm diameters in three colors: blue, red, and yellow.

Dimensions

Size: 17.5 mm diameter × 5 mm thick
Weight: 2.8 g1
Shaft diameter: 3 mm
Mounting hole size: #2-562

Notes:

1
For a single hub only (without set screw).
2
The set screw is #4-40.

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