# Pololu Universal Aluminum Mounting Hub for 8mm Shaft, M3 Holes (2-Pack) (POLOLU-2693)

**URL:** <https://forum.core-electronics.com.au/t/pololu-universal-aluminum-mounting-hub-for-8mm-shaft-m3-holes-2-pack-pololu-2693/15870>\
**Category:** Product Questions\
**Created:** [12 December 2022 04:04 UTC](https://forum.core-electronics.com.au/t/pololu-universal-aluminum-mounting-hub-for-8mm-shaft-m3-holes-2-pack-pololu-2693/15870 "2022-12-12T04:04:36Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Core](https://yyz2.discourse-cdn.com/flex028/user_avatar/forum.core-electronics.com.au/core/32/57_2.png) [@Core](https://forum.core-electronics.com.au/u/Core)\
**Post date:** [12 December 2022 04:04 UTC](https://forum.core-electronics.com.au/t/pololu-universal-aluminum-mounting-hub-for-8mm-shaft-m3-holes-2-pack-pololu-2693/15870/1 "2022-12-12T04:04:36Z")

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This is a placeholder topic for [**“Pololu Universal Aluminum Mounting Hub for 8mm Shaft, M3 Holes (2-Pack)”**](https://core-electronics.com.au/pololu-universal-aluminum-mounting-hub-for-8mm-shaft-m3-holes-2-pack.html) comments.

![](https://core-electronics.com.au/media/catalog/product/cache/5ba536955e3e815f4e908e49c1dd8155/0/j/0j7852.1200.jpg)

These universal aluminum mounting hubs allow you to mount custom wheels and mechanisms to 8 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).

[**Read more**](https://core-electronics.com.au/pololu-universal-aluminum-mounting-hub-for-8mm-shaft-m3-holes-2-pack.html)

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**Author:** ![Derek161426](https://avatars.discourse-cdn.com/v4/letter/d/b782af/32.png) [@Derek161426](https://forum.core-electronics.com.au/u/Derek161426)\
**Post date:** [12 December 2022 04:04 UTC](https://forum.core-electronics.com.au/t/pololu-universal-aluminum-mounting-hub-for-8mm-shaft-m3-holes-2-pack-pololu-2693/15870/2 "2022-12-12T04:04:37Z")

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Do you have a similar coupling for 9.25mm shaft?

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**Author:** ![Trent5487676](https://yyz2.discourse-cdn.com/flex028/user_avatar/forum.core-electronics.com.au/trent5487676/32/4583_2.png) [@Trent5487676](https://forum.core-electronics.com.au/u/Trent5487676)\
**Post date:** [13 December 2022 01:35 UTC](https://forum.core-electronics.com.au/t/pololu-universal-aluminum-mounting-hub-for-8mm-shaft-m3-holes-2-pack-pololu-2693/15870/3 "2022-12-13T01:35:03Z")

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Hi Derek,

Welcome to the forum 🙂

I haven’t seen many hubs specced for a 9.25mm shaft and I don’t really use customary units, but it sounds like it might be quite close to the bore size in some of our 3/8" sized gear.

> **[1310 Series Hyper Hub (3/8" Bore)](https://core-electronics.com.au/1310-series-hyper-hub-38-bore.html)**
>
> This hub allows you to mount components to a 3/8" shaft

The only hubs we have larger in metric sizing are the 10mm bore hubs.

> **[1301 Series Clamping Hub (10mm Bore)](https://core-electronics.com.au/1301-series-clamping-hub-10mm-bore.html)**
>
> A 10mm Bore 1301 Series Clamp Hub

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**Author:** ![Robert93820](https://avatars.discourse-cdn.com/v4/letter/r/ac91a4/32.png) [@Robert93820](https://forum.core-electronics.com.au/u/Robert93820)\
**Post date:** [13 December 2022 01:44 UTC](https://forum.core-electronics.com.au/t/pololu-universal-aluminum-mounting-hub-for-8mm-shaft-m3-holes-2-pack-pololu-2693/15870/4 "2022-12-13T01:44:14Z")

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Hi Derek  
3/8" is 9.525mm so your 9.25mm would not be a typo by any chance would it.  
9.25mm just seems to be an odd size.  
Cheers Bob