Brass Heat Insert Nuts with Iron Tip – M2, M3, M4, M5, M6 & M8

Achieve rock-solid threaded connections in plastic parts with this Brass Heat Insert Nut Kit. Designed for makers, engineers, and 3D printing enthusiasts, these CNC-machined brass threaded inserts are heated and pressed directly into thermoplastic components — creating durable, reusable metal threads that won't strip or loosen over time. The included iron tip makes installation clean and precise.

Why Choose These Heat Set Inserts?

Multi-Size Coverage: Includes M2, M3, M4, M5, M6, and M8 sizes to cover a wide range of 3D printing and fabrication projects.
CNC-Machined Brass: Precision-turned brass construction ensures tight tolerances, excellent conductivity for quick heat transfer, and long-lasting corrosion resistance.
Knurled Outer Profile: The knurled exterior grips the surrounding plastic firmly after insertion, preventing pull-out and rotation.
Compatible Iron Tip Included: The dedicated installation tip fits standard soldering irons, giving you consistent depth and alignment every time.
Perfect for 3D Printed Parts: Ideal for PLA, ABS, PETG, and other common FDM thermoplastics — upgrade your prints with professional-grade fastening.
Broad Applications: Great for RC models, enclosures, prototypes, robotics, electronics housings, and DIY assemblies.

Product Specifications

Material: Brass (CNC precision machined)
Thread Sizes: M2, M3, M4, M5, M6, M8
Processing: CNC fine-turned with knurled outer surface
Installation Method: Heat set via soldering iron with included tip
Compatible Materials: PLA, ABS, PETG, and most FDM thermoplastics
Brand: Zpaxo

How to Use

Attach the included iron tip to your soldering iron and allow it to reach the appropriate temperature.
Place the brass insert onto the pre-drilled hole in your plastic part.
Apply gentle, even pressure with the heated tip to press the insert flush with the surface.
Allow the plastic to cool and solidify around the knurled insert for a secure, permanent thread.

Frequently Asked Questions

Q: What are brass heat insert nuts and what are they used for?

A: Brass heat insert nuts (also called heat set inserts) are small threaded metal fasteners designed to be pressed into plastic parts using heat. They are widely used in 3D printing to add strong, reusable metal threads to FDM-printed components in sizes M2 through M8, making them ideal for enclosures, prototypes, robotics, and more.

Q: What soldering iron temperature should I use to install heat set inserts?

A: For most common thermoplastics like PLA, a temperature of around 200–230°C (390–446°F) works well. For ABS or PETG, slightly higher temperatures (230–260°C) may be needed. Always use the included iron tip and apply slow, steady pressure for the best results.

Q: Are these heat insert nuts compatible with standard soldering irons?

A: Yes. The included installation tip is designed to fit standard soldering irons, making this kit easy to use without any special equipment. Simply attach the tip, heat to the appropriate temperature, and press the insert into your pre-drilled hole.

Q: Which plastic materials are compatible with these brass threaded inserts?

A: These heat set inserts work with most FDM 3D printing thermoplastics, including PLA, ABS, PETG, and similar materials. They are not recommended for resin-based prints or materials that do not soften with heat.

Production & Packaging Notice

To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.