> **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

# Dual-Bearing Timing Belt Idler Pulley (8mm Bore, 18.5mm Diameter, 9.5mm Inside Width)

**Type:** Product page · **SKU:** GB-3428-0019-0008 · **Brand:** [goBilda](https://core-electronics.com.au/brands/gobilda)
**Page:** https://core-electronics.com.au/dual-bearing-timing-belt-idler-pulley-8mm-bore-185mm-diameter-95mm-inside-width.html ([markdown](https://core-electronics.com.au/dual-bearing-timing-belt-idler-pulley-8mm-bore-185mm-diameter-95mm-inside-width.html.md))

This 8mm Round Bore Dual-Bearing Timing Belt Idler Pulley is constructed of two 8mm round bore bearings and a polycarbonate plastic pulley......

## Pricing

- **Price:** $11.80 (inc GST) — $10.73 AUD, exc GST
- **Quantity discounts:** 10+ $10.19 (exc GST) · 25+ $9.65 (exc GST)

## Availability & dispatch

- Available with a lead time — expect dispatch between Aug 24 and Aug 26.

## How to buy

- **Build a cart:** compose `https://core-electronics.com.au/cart/link?items=GB-3428-0019-0008:1` (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.
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- **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 8mm Round Bore Dual-Bearing Timing Belt Idler Pulley is constructed of two 8mm round bore bearings and a polycarbonate plastic pulley. You can slip it onto an 8mm round or 8mm REX™ standoff or shaft to change the tension and trajectory of a timing belt.

The polycarbonate plastic pulley provides an ultra-smooth surface for either the smooth or toothed side of a timing belt to run with ease. Its flanges, 9.5mm apart, act as guardrails for belt security.

While one bearing is flush with the plastic pulley, the other is nestled inside. This allows for different offsets according to the direction you mount the idler. And if you attach this idler to your project via tightening a screw or otherwise putting an axial load on the bearings, the rotation will remain as smooth as ever due to the bearings’ inner races being coincident with each other.

### Downloads

- [ STEP File ](https://core-electronics.com.au/attachments/localcontent/3428-0019-0008_40531766fb8.zip)
- [ Spec Sheet ](https://core-electronics.com.au/attachments/localcontent/3428-0019-0008_spec-sheet_230084a50c8.pdf)

### Specs

| Weight | 7.4g |
|---|---|
| Material | Polycarbonate Plastic Idler with High-Carbon Steel Bearings |

## Images

- [Product image 1](https://core-electronics.com.au/media/catalog/product/G/B/GB-3428-0019-0008-1.jpg)