Robotic prototyping & wheels


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Coupler/Hub for 4mm shaft - M3 screw


2 x shaft coupler - 4mm shaft - M3 screws

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6,49 € tax incl.


Connection hub for 4mm shaft motor

The shaft hub are universal coupler made with aluminium. With them, you can place whelel on 4mm shaft or mount other items on a shaft.

Each couple does have 4 holes with M3 thread.


  • Size: 19mm
  • Height: 5mm
  • Weight: 3.2gr (each)
  • Shaft diameter: 4mm
  • Screw size: M3


  • 2 x aluminium coupler (also named shaft hub)
  • 2 x M3 screw
  • 1 x #4-40 screw (to fix the coupler on M4 shaft)
  • 1 x #4-40 Allen


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