# Brass Heat-Set Inserts for Plastic - M3 x 4mm - 50 pack

**Type:** Product page · **SKU:** ADA4255 · **Brand:** [Adafruit](https://core-electronics.com.au/brands/adafruit-australia)
**Page:** https://core-electronics.com.au/brass-heat-set-inserts-for-plastic-m3-x-4mm-50-pack.html ([markdown](https://core-electronics.com.au/brass-heat-set-inserts-for-plastic-m3-x-4mm-50-pack.html.md))

These heatset inserts will improve the connection strength between your project's 3D-printed parts, and also have nice clean surfaces? Instead of gluing bits together, or screwing plastic you can set these into the printed part and use M3 screws to fix…

## Pricing

- **Price:** $12.05 (inc GST) — $10.95 AUD, exc GST
- **Quantity discounts:** 10+ $10.63 (exc GST) · 50+ $10.41 (exc GST)

## Availability & dispatch

- Available with a lead time — expect dispatch between Aug 18 and Aug 24.

## Description

Wanna improve the connection strength between your project's 3D-printed parts, and also have nice clean surfaces? Instead of gluing bits together, or screwing plastic screws directly into your 3D prints, use strong and reusable machine screws and heat-set inserts. Heat set inserts are only a few cents a piece and have a grooved outside, with theads on the inside. Originally they were designed for injection molded parts but they work fabulously for 3D printed plastic as well.

You could use a plain soldering iron to try to heat-press these in - Heat up the iron and use it to press the insert in, wait for it to cool, then use like a hex nut that's embedded inside the plastic. [**Adafruit strongly recommend Adafruit's heat-set insert tool for soldering irons** ](https://core-electronics.com.au/heat-set-insert-for-soldering-irons-4-40-m3-inserts.html)because it's really hard to insert them straight otherwise and you risk damaging your print!

Comes as a 50 pack of M3-threaded inserts that are 4mm long.

Dimensions:

- OD 4.2mm
- ID M3 thread
- Length 4mm

## Images

- [Product image 1](https://core-electronics.com.au/media/catalog/product/4/2/4255-02.jpg)