Pololu Universal Aluminum Mounting Hub for 4mm Shaft, M3 Holes (2-Pack)

Overview

These universal mounting hubs are designed to work with most 4 mm diameter shafts, including round shafts, and “D” shafts. Each of the two included hubs has four mounting holes for M3 screws (not included), letting you mount custom wheels or mechanisms to your motors. The two included M3 hex set screws (one for each hub) allow secure coupling of shaft to hub, and a 1.5 mm hex wrench is included for use with the set screws. A dimension diagram of the hub is available under the resources tab.

Pololu Universal Aluminium Mounting Hub family

We have an assortment of hubs available for various shaft sizes and with different mounting hole thread options. Each Universal Mounting Hub is compatible with a variety of our wheels as detailed in the following table:

		Pololu Universal Mounting Hubs
		for 3mm shafts	for 4mm shafts	for 5mm shafts	for 6mm shafts	for 1/4″ shafts	for 8mm shafts
		M3 holes #4-40 holes #2-56 holes	M3 holes #4-40 holes	M3 holes #4-40 holes	M3 holes #4-40 holes	M3 holes #4-40 holes	M3 holes
Pololu Wheels for 3mm Shafts	32×7mm	–	–	–	–	–	–
	40×7mm	–	–	–	–	–	–
	60×8mm				–	–	–
	70×8mm				–	–	–
	80×10mm
	90×10mm
Pololu Wheels for Servos	40×7mm	–	–	–	–	–	–
	60×8mm
	70×10mm	–	–	–
	90×10mm	–	–	–
Pololu Multi-Hub Wheels	80×10mm	–	–	–

White Pololu Wheel 60×8mm on a Pololu 20D mm Metal Gearmotor.

Black Pololu Wheel 90×10mm on a Pololu 37D mm Metal Gearmotor.

Dimensions

Notes:

1

For a single hub only (without set screw).

2

This is also the size of the set screw.

File downloads

• Pololu universal aluminium mounting hub for 4mm shaft, M3 holes mechanical drawing (34k pdf)

  Printable mechanical drawing for the Pololu universal aluminium mounting hub for 4mm shaft, M3 holes.

• 3D model of Pololu Universal Aluminium Mounting Hub for 4mm Shaft, M3 Holes (1MB step)