Pololu Universal Aluminium Mounting Hub (4mm Shaft) Pair, 4-40 Holes, 1081

£6.89 £5.74

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.

  • Buy 10 for £5.90 £4.92 each and save 14%

The set includes one Allen wrench and two 4-40 set screws for securing the hubs to motor shafts.

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.



19 mm diameter × 5 mm thick


3.2 g1

Shaft diameter:

4 mm

Mounting hole size:



For a single hub only (without set screw).

This is also the size of the set screw.