# Pololu Universal Aluminum Mounting Hub for 5mm Shaft, \#4-40 Holes (2-Pack)

**Type:** Product page · **SKU:** POLOLU-1203 · **Brand:** [Pololu](https://core-electronics.com.au/brands/pololu-australia)
**Page:** https://core-electronics.com.au/pololu-universal-aluminum-mounting-hub-for-5mm-shaft-4-40-holes-2-pack.html ([markdown](https://core-electronics.com.au/pololu-universal-aluminum-mounting-hub-for-5mm-shaft-4-40-holes-2-pack.html.md))

These universal aluminum mounting hubs allow you to mount custom wheels and mechanisms to 5 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 #4-40 screws (not included).

## Pricing

- **Price:** $18.95 (inc GST) — $17.23 AUD, exc GST
- **Quantity discounts:** 10+ $16.54 (exc GST) · 25+ $16.02 (exc GST)

## Availability & dispatch

- In stock, ships same business day if ordered before 2PM (Australia/Sydney).
- We can dispatch 2 today, and up to 500 more in 4–7 days.

## Description

| [![](https://core-electronics.com.au/media/remote_images/0J2469.250_5wIPgG.jpg%3Fdc3da73b100ec509676311c0dc5ee4f3)](https://core-electronics.com.au/#) |
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| 5mm Pololu universal aluminum mounting hub on a stepper motor with a 5mm-diameter output shaft. |

These universal mounting hubs are designed to work with most 5 mm diameter shafts, including round shafts and “D” shafts, such as those on Pololu's [stepper motors](https://core-electronics.com.au/#). Each of the two included hubs has four mounting holes for [\#4-40 screws](https://core-electronics.com.au/machine-screw-4-40-1-2-length-phillips-25-pack.html) (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](https://core-electronics.com.au/hex-allen-wrench-0-05.html) (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.

These hubs will work with most of Pololu's [stepper motors](https://core-electronics.com.au/#) (the ones with 5 mm shafts), and they also work with 60 mm, 70 mm, 80 mm, and 90 mm [Pololu wheels](https://core-electronics.com.au/#).

 | [![](https://core-electronics.com.au/media/remote_images/0J2763.300_xeS73R.jpg%3F05b54bb3db229f67c35850795c461ea9)](https://core-electronics.com.au/#) |
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| Pololu wheels with 90, 80, 70, and 60mm diameters in three colors: blue, red, and yellow. |

**Documents:**

- [Dimensional Drawing](https://core-electronics.com.au/attachments/localcontent/1203-5mm-4-40-hub-dimensions_33380ace5db.pdf)

## Images

- [Product image 1](https://core-electronics.com.au/media/catalog/product/p/o/pololu_universal_aluminum_mounting_hub_for_5mm_shaft_4_40_holes__2_pack___pololu_1203__00.jpg)