Universal Aluminium Mounting Hub for 4mm Shaft, 4-40 Holes (2-pack)

£5.82 inc VAT

Availability: 21 in stock (can be backordered)

Brand: Pololu
Part Number: 1081
Barcode: 5055421023119

Universal Aluminium Mounting Hub for 4mm Shaft – Pololu 1081

These universal mounting hubs are designed to allow custom wheels and mechanisms to be fitted to 4mm motor shafts. They will work with most motor shaft types including round and “D” type shafts. Each hub has 4 threaded mounting holes designed to be used with #4-40 screws. Screwing the included #4-40 set screws into the set screw holes allows the hub to be secured to a 4mm motor shaft.


  • Size: 19mm diameter x 5mm thick
  • Weight: 3.2 g*
  • Shaft Diameter: 4 mm
  • Mounting Hole Size: #4-40

* This value is for a single mounting hub without set screw.

Included Items:

  • Two mounting hubs
  • Three #4-40 set screws (one for each hub and a spare)
  • One 0.05″ Allen wrench

Note: Screws for mounting wheel or mechanism to hub not included.


Pololu 4mm Shaft Mounting Hub with included hardware



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