> **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 # 1309 Series Sonic Hub (8mm REX Bore) **Type:** Product page · **SKU:** GB-1309-0016-4008 · **Brand:** [goBilda](https://core-electronics.com.au/brands/gobilda) **Page:** https://core-electronics.com.au/1309-series-sonic-hub-8mm-rex-bore.html ([markdown](https://core-electronics.com.au/1309-series-sonic-hub-8mm-rex-bore.html.md)) This hub has an 8mm REX bore to match our ## Pricing - **Price:** $13.50 (inc GST) — $12.27 AUD, exc GST - **Quantity discounts:** 10+ $11.65 (exc GST) · 25+ $11.05 (exc GST) ## Availability & dispatch - In stock, ships same business day if ordered before 2PM (Australia/Sydney). - We can dispatch 11 today, and up to 4300 more in 7–10 days. ## How to buy - **Build a cart:** compose `https://core-electronics.com.au/cart/link?items=GB-1309-0016-4008:1` (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/GB-1309-0016-4008:1.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 This hub has an 8mm REX™ bore to match our [8mm REX™ shafting](https://www.gobilda.com/stainless-steel-rex-shafting-8mm-diameter/). The hex profile creates a positive drive that can handle heavy torque loads without concern of rounding out. The Sonic style hub is perfectly balanced for high-speed applications. The unique design conforms tightly around a shaft when tightened, and it does so without distorting the threaded holes on the goBILDA® 16mm pattern. The outer profile is 32mm so that it can be run in a bearing to isolate radial loads—or even clamped around! ### Features **Made for 8mm REX Shafting** This hub allows you to mount components to an [8mm REX™ shaft](https://www.gobilda.com/stainless-steel-rex-shafting/#2106-series-8mm-rex-stainless-steel-shafting). A "REX" shaft is part Round and part Hex. An 8mm REX shaft is 7mm flat-to-flat, like 7mm hex shafts. The difference is, that the tips are precision ground to an 8mm diameter allowing it to fit in an 8mm bearing. The bore of this hub has enough clearance in the corners to accept most 7mm hex shafts. **Part of a Large Ecosystem of Parts** The goBILDA® ecosystem has many parts that bolt directly to this hub. That includes [wheels](https://www.gobilda.com/wheels-tires/), [gears](https://www.gobilda.com/hub-mount-gears/), [sprockets](https://www.gobilda.com/sprockets-chain/), [track sprockets](https://www.gobilda.com/tracks/), [timing pulleys](https://www.gobilda.com/timing-belts-pulleys/), [round belt pulleys](https://www.gobilda.com/round-belts-pulleys/), [winch pulleys](https://www.gobilda.com/cable-pulleys/), [control arms](https://www.gobilda.com/push-arms/), and more! **High-Speed Design - Completely Balanced** The innovative Sonic Hub design is perfectly balanced. It will not introduce vibrations into your build, even in high-speed applications. **Will Not Get Stuck or Marr Shaft** Our patented [Sonic Hub](https://www.gobilda.com/sonic-hubs/) design holds incredibly tight to the shaft without damaging it. When it is time to disassemble, it readily releases its grip on the shaft. **Precisely Machined** This hub is machined for high-precision fitment. **Will Not Corrode or Rust** The body of this hub is aluminum, and the pinch bolts are zinc-plated steel. **Lightweight & Strong** Aluminum has an excellent strength-to-weight ratio, allowing this hub to be both light and strong. ### Downloads - [ STEP File ](https://core-electronics.com.au/attachments/localcontent/1309-0016-4008_15968332b89.zip) - [ Spec Sheet ](https://core-electronics.com.au/attachments/localcontent/1309-0016-4008_spec_sheet_19063616c76.pdf) ### Specs | Weight | 14g | |---|---| | Material | Aluminum | | Finish | Clear Anodized | | IP | Patented | ## Images - [Product image 1](https://core-electronics.com.au/media/catalog/product/G/B/GB-1309-0016-4008-1.jpg)