> **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 # 12mm Hex Wheel Adapter for 3mm Shaft (2-Pack) **Type:** Product page · **SKU:** POLOLU-2682 · **Brand:** [Pololu](https://core-electronics.com.au/brands/pololu-australia) **Page:** https://core-electronics.com.au/12mm-hex-wheel-adapter-for-3mm-shaft-2-pack.html ([markdown](https://core-electronics.com.au/12mm-hex-wheel-adapter-for-3mm-shaft-2-pack.html.md)) These 17 mm long aluminum adapters convert a 3 mm diameter shaft to a 12 mm hex shaft that is compatible with many common hobby RC wheels. The set includes two adapters, two M4 screws for securing wheels to the adapters, four M3 set screws for securing the adapters to motor shafts, and one 1.5 mm Allen wrench for use with the set screws. ## Pricing - **Price:** $11.20 (inc GST) — $10.18 AUD, exc GST - **Quantity discounts:** 10+ $9.77 (exc GST) · 25+ $9.47 (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=POLOLU-2682:1` (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/POLOLU-2682:1.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 These light-weight aluminum shaft adapters convert a typical motor output shaft into a 12 mm hex shaft that is compatible with many common hobby RC wheels, such as the [Dagu Wild Thumper Wheels](https://core-electronics.com.au/dagu-wild-thumper-wheel-120x60mm-pair-with-4mm-shaft-adapters-chrome.html). The side of each adapter that mounts to the wheel contains a hole tapped for M4 screws, and the other side of the adapter mounts to a motor shaft with two M3 set screws. This set includes a pair of adapters, two 8 mm M4 screws, four M3 set screws, and one 1.5 mm Allen wrench for use with the set screws. The adapters are available in the following versions: - [12 mm Hex Wheel Adapter for 3 mm Shaft](https://core-electronics.com.au/12mm-hex-wheel-adapter-for-3mm-shaft-2-pack.html) (17 mm length) - [12 mm Hex Wheel Adapter for 4 mm Shaft](https://core-electronics.com.au/12mm-hex-wheel-adapter-for-4mm-shaft-2-pack.html) (17 mm length) - [12 mm Hex Wheel Adapter for 6 mm Shaft](https://core-electronics.com.au/12mm-hex-wheel-adapter-for-6mm-shaft-2-pack.html) (20 mm length) - [12 mm Hex Wheel Adapter for 6 mm Shaft, Extended](https://core-electronics.com.au/12mm-hex-wheel-adapter-for-6mm-shaft-extended-2-pack.html) (35 mm length) **Details for item #2682** | [![](https://core-electronics.com.au/attachments/localcontent/0J6116_4579104d88c.jpg)](https://core-electronics.com.au/attachments/localcontent/0J6116_3109111a64e.jpg) | |---| | 12mm Hex Wheel Adapter for 3mm Shaft on a Micro Metal Gearmotor. | This version of the 12 mm hex adapter is 17 mm in length and designed to work with 3 mm diameter output shafts, including round and “D” shafts. It works well with Pololu's [Micro Metal Gearmotors](https://core-electronics.com.au/components/motors/metal-gearmotors/micro.html) (as shown in the picture above) and [Mini Plastic Gearmotors](https://core-electronics.com.au/search/?q=mini+plastic+gearmotor), as well as the other [3 mm shaft gearmotors](https://core-electronics.com.au/category/57/3mm-shaft-gearmotors) Pololu carry. The wheel shown in the above picture is a hobby RC wheel that works with 12mm hex shafts; Pololu do not currently carry this wheel or any other wheels that are compatible with this adapter. The diagram below shows the dimensions of this shaft adapter and is also available as a downloadable PDF (109k pdf) | [![](https://core-electronics.com.au/attachments/localcontent/0J6100_27142525245.jpg)](https://core-electronics.com.au/attachments/localcontent/0J6100_74105c2a8b6.png) | |---| | Dimension diagram of the Pololu 12mm Hex Wheel Adapter for 3mm Shaft. Units are mm over \[inches\]. | **People often buy this product together with:** | [![Pololu Micro Metal Gearmotor Bracket Pair - Black](https://core-electronics.com.au/attachments/localcontent/0J1128_293715d398.jpg)](https://core-electronics.com.au/pololu-micro-metal-gearmotor-bracket-pair-black.html) | [Pololu Micro Metal Gearmotor Bracket Pair - Black](https://core-electronics.com.au/pololu-micro-metal-gearmotor-bracket-pair-black.html) | |---|---| | [![Pololu Micro Metal Gearmotor Bracket Extended Pair](https://core-electronics.com.au/attachments/localcontent/0J1130_2188a9638f.jpg)](https://core-electronics.com.au/pololu-micro-metal-gearmotor-bracket-extended-pair.html) | [Pololu Micro Metal Gearmotor Bracket Extended Pair](https://core-electronics.com.au/pololu-micro-metal-gearmotor-bracket-extended-pair.html) | |---|---| | [![Pololu Universal Aluminum Mounting Hub for 3mm Shaft, M3 Holes (2-Pack)](https://core-electronics.com.au/attachments/localcontent/0J1103_27288e769e.jpg)](https://core-electronics.com.au/pololu-universal-aluminum-mounting-hub-for-3mm-shaft-m3-holes-2-pack.html) | [Pololu Universal Aluminum Mounting Hub for 3mm Shaft, M3 Holes (2-Pack)](https://core-electronics.com.au/pololu-universal-aluminum-mounting-hub-for-3mm-shaft-m3-holes-2-pack.html) | |---|---| **Dimensions** | Size: | 12 mm hex × 17 mm length | |---|---| | Length: | 17 mm | | Weight: | 5.1 g[1](https://core-electronics.com.au/#note1) | | Shaft diameter: | 3 mm | **General specifications** | Style: | short | |---|---| **Notes:** 1For a single adapter only (without set screws or mounting screw). **File downloads** - **Pololu 12mm hex wheel adapter for 3mm shaft dimension diagram (109k pdf)** - **Pololu 12mm hex wheel adapter for 4mm shaft dimension diagram (108k pdf)** - **Pololu 12mm hex wheel adapter for 6mm shaft dimension diagram (134k pdf)** - **Pololu extended 12mm hex wheel adapter for 6mm shaft dimension diagram (112k pdf)** ## Images - [Product image 1](https://core-electronics.com.au/media/catalog/product/0/j/0j6531.1200.jpg)