> **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

# 2303 Series Steel, MOD 0.8 Pinion Gear (8mm REX Bore, 30 Tooth)

**Type:** Product page · **SKU:** GB-2303-4008-0030 · **Brand:** [goBilda](https://core-electronics.com.au/brands/gobilda)
**Page:** https://core-electronics.com.au/2303-series-steel-mod-08-pinion-gear-8mm-rex-bore-30-tooth.html ([markdown](https://core-electronics.com.au/2303-series-steel-mod-08-pinion-gear-8mm-rex-bore-30-tooth.html.md))

This 30 tooth 8mm REX bore pinion gear is ready to rip! The bore perfectly matches our

## Pricing

- **Price:** $19.90 (inc GST) — $18.09 AUD, exc GST
- **Quantity discounts:** 10+ $17.18 (exc GST) · 25+ $16.28 (exc GST)

## Availability & dispatch

- Available with a lead time — expect dispatch between Aug 31 and Sep 01.

## How to buy

- **Build a cart:** compose `https://core-electronics.com.au/cart/link?items=GB-2303-4008-0030:1` (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-2303-4008-0030:1.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 30 tooth 8mm REX™ bore pinion gear is ready to rip! The bore perfectly matches our 8mm REX™ shafting to create a positive drive. While little work is left for the set-screws, we put two of them in for good measure. This particular gear is able to be meshed with a 90 tooth hub gear spaced 48mm away for a 3:1 ratio, or, it can mate to another 30 tooth gear to create a very compact 1:1 ratio only 24mm apart! If your build provides the freedom to adjust the spacing between your gears, it’s able to mesh to any MOD 0.8 gear that suits your fancy. Notice the built-in shim on the bottom of the gear, as well as the counterbore on the top side of the gear--both allow you to run right up against a bearing without the use of a shim!

### SET-SCREW WITH THREAD-LOCKING NYLON PATCH

The set-screw included with this product features a **nylon patch**: a blue dollop of thread-locking magic that ensures **extraordinary resistance to loosening** from vibration!

### Downloads

- [ STEP File ](https://core-electronics.com.au/attachments/localcontent/2303-4008-0030_66408e679e1.zip)
- [ Spec Sheet ](https://core-electronics.com.au/attachments/localcontent/2303-4008-0030_spec-sheet_22050c60ab4.pdf)

### Specs

| Weight | 22g |
|---|---|
| Material | Steel |
| Finish | Black Zinc-Plated |
| Tooth Count | 30 |
| Gear Pitch | MOD 0.8 |
| Pressure Angle | 20 Degree |

## Images

- [Product image 1](https://core-electronics.com.au/media/catalog/product/G/B/GB-2303-4008-0030-1.jpg)