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4-40 6-32 8-32 (160pcs) Standard Threaded Inserts for Plastic Heat Set English Insert Knurled Nut Insert Threaded Brass Insert Assortment Kit for 3D Printing Injection Molding Thread Nuts

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$16.99

$ 7 .99 $7.99

In Stock

About this item

  • Durable Brass Threaded Inserts – Expertly crafted from premium brass, these inserts provide exceptional heat conductivity, superior corrosion resistance, and outstanding long-term durability. Designed to endure extreme temperatures exceeding 300°C, they offer excellent resistance to twisting and pulling forces, ensuring a secure and reliable fit in demanding applications.
  • Precision-Engineered Design – With precision crafted threads, these inserts ensure a secure fit and prevent slippage during use. The 45-degree knurl pattern enhances their grip, providing greater torque resistance and tensile strength for a more secure connection. The inserts also feature guide elements, simplifying the installation process by eliminating the need for countersinking.
  • Effortless Installation – Designed for versatility, these brass inserts can be installed using heat. Perfect for 3D printing projects, electronic assemblies, and circuit boards, they can be easily embedded into 3D printed parts with a regular soldering iron.
  • Wide Range of Applications – Compatible with all thermoplastics, including PLA, PETG, ABS, PPS, and PP, these inserts are ideal for a variety of uses. Whether you’re working on 3D printed models, injection-molded parts, automotive components, or electronics, these inserts deliver reliable and lasting performance.
  • Organized and Convenient Storage – Packaged in a durable, compartmentalized box, these inserts are neatly organized to prevent mixing during transport. Each compartment is clearly labeled, making it easy to find the specific insert you need, helping you work more efficiently.


These high-quality brass threaded inserts are designed to provide exceptional durability and versatility across a wide range of applications. Constructed from premium brass, they offer excellent heat conductivity and superior corrosion resistance, making them highly durable and reliable over the long term. Capable of withstanding extreme temperatures exceeding 300°C, these inserts are engineered to resist twisting and pulling forces, ensuring a secure and stable fit even in the most demanding environments. The precision-engineered design of these inserts features meticulously crafted threads that provide a secure, slip-free connection, preventing any unwanted loosening during use. The 45-degree knurl pattern further enhances their grip, delivering increased torque resistance and tensile strength, which contributes to a more robust and reliable fastening. Additionally, these inserts come equipped with guide elements that simplify the installation process by eliminating the need for countersinking or recessing, making them easier and faster to install. Versatile in their application, these brass inserts can be easily embedded into 3D printed parts, electronic assemblies, and circuit boards using a standard soldering iron or other heat-based methods. Their compatibility with all thermoplastic materials, including PLA, PETG, ABS, PPS, and PP, makes them ideal for a variety of uses, whether in 3D printed models, injection-molded parts, automotive components, or electronics housings. No matter the application, these inserts provide a reliable, long-lasting solution. To further enhance their usability, these inserts are packaged in a durable, compartmentalized box that keeps them neatly organized and prevents mixing during transport. Each compartment is clearly labeled, allowing you to quickly and easily find the specific insert you need, which significantly boosts your work efficiency and ensures that you always have the right tool for the job. Whether you’re a professional or a hobbyist, these brass threaded inserts are an essential addition to your toolkit.


Kadie Songer
Reviewed in the United States on February 20, 2025
I needed to thread some small screws into a 3D print. These worked perfectly. I used a soldering gun and sat these brass insets into the tip to let it heat then pressed them into the part. This works perfectly and when I run out I’ll buy these again!
Michael P. Thompson
Reviewed in the United States on March 14, 2024
I used then to mount a Pana vice on my bench. Easy to install and secure enough for the small vice.
Marcus
Reviewed in the United States on December 16, 2024
Good set of inserts for 3d prints. Good selection, good price, and work well.
Rob M
Reviewed in the United States on November 17, 2024
Exactly As described. No burrs or deformations. Will be used in my 3D prints.
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