> **Source:** Core Electronics is an Australian maker-electronics retailer and manufacturer based in Newcastle, NSW, run by a team of makers and educators. We design and manufacture our own product lines (PiicoDev, CE originals) and are official retailers for iconic maker and industrial brands including Raspberry Pi, Arduino, Adafruit, SparkFun and DFRobot. Orders ship Australia-wide from our Newcastle warehouse. Prices are in AUD and include GST. Pricing, stock and dispatch on this page are generated from the store's live catalog. Full machine-readable index: https://core-electronics.com.au/llms.txt

# Pololu Universal Aluminum Mounting Hub for 6mm Shaft, M3 Holes (2-Pack)

**Type:** Product page · **SKU:** POLOLU-1999 · **Brand:** [Pololu](https://core-electronics.com.au/brands/pololu-australia)
**Page:** https://core-electronics.com.au/pololu-universal-aluminum-mounting-hub-for-6mm-shaft-m3-holes-2-pack.html ([markdown](https://core-electronics.com.au/pololu-universal-aluminum-mounting-hub-for-6mm-shaft-m3-holes-2-pack.html.md))

These universal aluminum mounting hubs allow you to mount custom wheels and mechanisms to 6 mm diameter motor shafts. The set includes two hubs, four M3 set screws for securing the hubs to motor shafts, and one 1.5 mm Allen wrench for use with the set screws. Each hub has six threaded mounting holes for M3 screws (not included).

## Pricing

- **Price:** $21.50 (inc GST) — $19.55 AUD, exc GST
- **Quantity discounts:** 10+ $18.76 (exc GST) · 25+ $18.18 (exc GST)

## Availability & dispatch

- In stock, ships same business day if ordered before 2PM (Australia/Sydney).
- We can dispatch 4 today, and up to 350 more in 4–7 days.

## How to buy

- **Build a cart:** compose `https://core-electronics.com.au/cart/link?items=POLOLU-1999:1` (comma-separated SKU:qty pairs) and share the link. Opening it shows a confirmation page with live pricing and stock before anything is added to the cart.
- **Verify the cart first:** fetch `https://core-electronics.com.au/cart/link/POLOLU-1999:1.md` for live line prices (inc & exc GST, quantity discounts applied), stock and dispatch estimates, and totals. Append `/to/{AU-postcode}` (or `/to/{country-code}:{postcode}`) before `.md` for delivery options and prices to that destination. Unknown, retired, or out-of-stock SKUs are flagged. (Query form `cart/link.md?items=...` also works but some robots parsers refuse query strings here.)
- **Checkout** is completed on-site and includes a captcha at the payment step. Share the cart link; checkout takes it from there.
- **Search the catalogue:** `https://core-electronics.com.au/search/{query}.md` (URL-encode the query; pages 2-3 at `search/{query}/{page}.md`; `search.md?q=` also works)
- **Payment methods, purchase orders, policies and contact details:** https://core-electronics.com.au/llms.txt
## Description

These universal mounting hubs are designed to work with most [6 mm diameter shafts](https://core-electronics.com.au/#), including round shafts and “D” shafts. Each of the two included hubs has six mounting holes for [M3 screws](https://core-electronics.com.au/machine-screw-m3-8mm-length-phillips-25-pack.html) (not included), letting you mount custom wheels or mechanisms to your motors. The four included M3 hex set screws (two 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.

The picture to the right shows a hub with [Pololu’s 19:1 metal gearmotor 37Dx52L mm](https://core-electronics.com.au/19-1-metal-gearmotor-37dx52l-mm.html) and a [Pololu stamped aluminum L-bracket for 37D mm metal gearmotors](https://core-electronics.com.au/pololu-stamped-aluminum-l-bracket-pair-for-37d-mm-metal-gearmotors.html). These hubs will work with any of our [37D mm metal gearmotors](https://core-electronics.com.au/#), and they also work with 80 mm and 90 mm [Pololu wheels](https://core-electronics.com.au/#).

 | \| [![](https://core-electronics.com.au/media/remote_images/0J1108.250_gyR2lI.jpg%3Fd003edcb57980bc5ead6f615d4f868a4)![](https://core-electronics.com.au/media/remote_images/zoom-d0cfc0fffa825c4654893ef42b77cee3_xEyO7c.png)](https://core-electronics.com.au/#) \| \|---\| \| Gearmotor with bracket and hub. \| | \| [![](https://core-electronics.com.au/media/remote_images/0J2595.250_84f3eg.jpg%3F95be65618507363e4feac18d54979eef)![](https://core-electronics.com.au/media/remote_images/zoom-d0cfc0fffa825c4654893ef42b77cee3_xEyO7c.png)](https://core-electronics.com.au/#) \| \|---\|---\| \| Black Pololu 90×10mm wheel on a Pololu 37D mm metal gearmotor. \| |
|---|

**Documents:**

- [Dimensional Drawing](https://core-electronics.com.au/attachments/localcontent/1999-6mm-m3-hub-dimensions_46790fd3670.pdf)

## Images

- [Product image 1](https://core-electronics.com.au/media/catalog/product/p/o/pololu_universal_aluminum_mounting_hub_for_6mm_shaft_m3_holes__2_pack___pololu_1999__00.jpg)