> **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

# Extension Spring (6.5mm OD, 1.5kg Max Load, 39-72mm Length)

**Type:** Product page · **SKU:** GB-2915-0001-0003 · **Brand:** [goBilda](https://core-electronics.com.au/brands/gobilda)
**Page:** https://core-electronics.com.au/extension-spring-65mm-od-15kg-max-load-39-72mm-length.html ([markdown](https://core-electronics.com.au/extension-spring-65mm-od-15kg-max-load-39-72mm-length.html.md))

This steel extension spring—as utilized in our.....

## Pricing

- **Price:** $6.75 (inc GST) — $6.14 AUD, exc GST
- **Quantity discounts:** 10+ $5.83 (exc GST) · 25+ $5.53 (exc GST)

## Availability & dispatch

- In stock, ships same business day if ordered before 2PM (Australia/Sydney).
- We can dispatch 2 today, and up to 900 more in 7–10 days.

## How to buy

- **Build a cart:** compose `https://core-electronics.com.au/cart/link?items=GB-2915-0001-0003:1` (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-2915-0001-0003:1.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 steel extension spring—as utilized in [our Odometry Pod](https://core-electronics.com.au/odometry-pod-43mm-width-48mm-wheel-2048-ppr-encoder.html)—provides the crucial downforce that allows the omni wheel to make consistent contact with the soft tile surface used in the First Tech Challenge (FTC). The spring’s 33mm of usable travel yields excellent overall travel for the pod; even when your robot experiences an obstacle, the wheel remains grounded.

This spring also has many uses outside odometry. While similar in shape and size, this spring has a lighter pull than the 2915-0001-0002, and can help to maintain proper tension on strings and cables that need a fair bit less of a tug.

Mounting the spring is simple: the 5mm ID loop-ends slip over M4 screws and allow the spring to rotate about the screw in non-linear applications.

### Downloads

- [ STEP File ](https://core-electronics.com.au/attachments/localcontent/2915-0001-0003_632702ce2a0.zip)

### Specs

| Weight | 2.8g |
|---|---|
| Material | Spring-Tempered Steel |

## Images

- [Product image 1](https://core-electronics.com.au/media/catalog/product/G/B/GB-2915-0001-0003-1.jpg)