Looking for the best M4 brass inserts to enhance your 3D printing and plastic parts projects? We’ve researched and compiled a list of the top 10 M4 brass inserts to help you upgrade your projects with ease and confidence.
M4 brass inserts are a game-changer for 3D printing and plastic parts. They make your projects stronger and more reliable. These small but mighty components ensure a secure fit every time.
With so many options available, finding the best M4 brass inserts can be tricky. We’ve done the research to help you choose the perfect ones for your needs. Get ready to upgrade your projects with confidence!
List of Top 10 M4 Brass Inserts
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Yaocom 300 Pcs M4 Threaded Inserts M4 x D6 x L6 Heat Set Inserts Brass 3D Printing Knurled Metric Nuts for Plastic, 3D Printing Components |
Yaocom 300 Pcs M4 Threaded Inserts are perfect for 3D printing fans, makers, and anyone fixing electronics. They are great for plastic parts, computer items, and circuit boards. |
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ruthex M4 Threaded Inserts – 50 Pieces RX-M4x8.1 Brass Heat Set Insert for Plastic Parts – Metric knurled Nuts – Insert by Heat into 3D Printing Components |
These M4 threaded inserts are perfect for 3D printing enthusiasts who want to strengthen their plastic parts. They’re easy to use and work with many types of plastics, making them ideal for DIY projects. |
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HANGLIFE Heat-Set Threaded Inserts, M4 Heat Set Insert for 3D Printing Components and Plastic Parts – Brass Metric Knurled Nuts (100 Pieces) |
HANGLIFE Heat-Set Threaded Inserts are perfect for 3D printing fans and makers who want strong, reliable parts. They work great for anyone using plastics like PLA, ABS, or PETG. |
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120pcs 3D Printing Brass Nuts, M4x6x6mm Threaded Heat Set Inserts M4 Knurled Brass Nuts Heat Embedment Nut for 3D Printing Parts Loptop Automotive Plastic Shell |
This product is perfect for 3D printing hobbyists and DIY builders needing strong, durable nuts. Premium brass and high-temperature resistance ensure reliable use in automotive, electronics, and plastic projects. |
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uxcell Knurled Insert Nuts, 50pcs M4 x 4mm L x 6mm OD 3D Printing Brass Nuts Female Threaded Inserts Brass Heat Set Insert Embedment Nuts |
These uxcell Knurled Insert Nuts are perfect for 3D printing enthusiasts, engineers, and makers who need reliable and durable brass nuts for their projects. They’re easy to install and stay firmly in place, making them ideal for tight fixing in plastic parts, electronics, and circuit boards. |
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150 Pcs M4 Threaded Inserts for Plastic with Heat Set Tip,M4*(6mm-10mm Hight)*5.5mm Heat Set Inserts Kit,Brass Inserts for 3D Pringting |
This 150-piece M4 threaded insert kit is perfect for 3D printing enthusiasts and makers who need strong, reliable connections in their plastic parts. It’s easy to use and works great with PLA, ABS, and PETG materials. |
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Ktehloy 400Pcs Threaded Inserts, M2 M2.5 M3 M4 M5 M6 Female Thread Metric Knurled Nuts Assortment Kit, Brass Heat Set Insert for Plastic and 3D Printing Components (Threaded Inserts Ket) |
Perfect for 3D printing enthusiasts and professionals, this kit is ideal for anyone working with thermoplastics like PLA, PETG, ABS, PPS, or PP. Whether you’re crafting automotive parts, laptop shells, or injection-molded components, these high-quality brass inserts ensure strong, reliable connections every time. |
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ruthex M4 Threaded Inserts Short – 50 Pieces RX-M4Sx4.0 Brass Heat Set Insert for Plastic Parts – Metric knurled Nuts – Insert by Heat into 3D Printing Components |
Perfect for 3D printing hobbyists, makers, and engineers needing strong threads in plastic parts. These brass inserts fit M4 screws and install easily with heat or ultrasound into PLA, PETG, ABS, and other thermoplastics. They offer a firm grip, corrosion resistance, and can be reused for lasting, reliable fastening. |
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Aoserge 100Pcs M4 Brass Heat Set Inserts – Premium Knurled Threaded Nuts for 3D Printing, Plastic Parts & DIY Projects, High-Temperature Resistant, Easy Heat Installation(M4x6x6mm) |
Perfect for makers, workshops, and DIY enthusiasts, these M4 brass heat set inserts are ideal for anyone working with 3D printing, plastic parts, or woodworking projects. They’re easy to install and built to last, making them a reliable choice for strong, durable connections. |
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Ktehloy 100Pcs M4 Heat Set Inserts, Metric knurled Nuts Brass Heat Set Insert for Plastic Parts,Insert by Heat into 3D Printing Components (M4xL6xD6) |
Perfect for 3D printing enthusiasts and professionals, these M4 heat set inserts are ideal for anyone working with plastic parts. Whether you’re assembling components or enhancing durability, they offer reliable and easy-to-use solutions. |
Detailed Reviews
Discover the top 10 M4 Brass Inserts handpicked for quality, durability, and ease of use. Perfect for 3D printing, electronics, and more, these inserts ensure strong, secure connections every time. Whether you need heat-resistant, corrosion-proof, or easy-to-install options, this guide has you covered. Find the best fit for your projects and upgrade your work with confidence.
1. Yaocom 300 Pcs M4 Threaded Inserts M4 x D6 x L6 Heat Set Inserts Brass 3D Printing Knurled Metric Nuts for Plastic, 3D Printing Components

Get ready to upgrade your projects with these 300 M4 threaded inserts! They’re perfect for 3D printing, electronics, and more, offering a huge supply for all your needs.
These inserts are made of quality brass. They are strong and smooth. They won’t deform easily.
Installation is a breeze! Just heat or ultrasonically insert them into plastic. Their precise design ensures a secure fit that won’t slip, giving you rock-solid stability.
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Perfect For:
Yaocom 300 Pcs M4 Threaded Inserts are perfect for 3D printing fans, makers, and anyone fixing electronics. They are great for plastic parts, computer items, and circuit boards.
Ready to Purchase?
2. ruthex M4 Threaded Inserts – 50 Pieces RX-M4x8.1 Brass Heat Set Insert for Plastic Parts – Metric knurled Nuts – Insert by Heat into 3D Printing Components

ruthex M4 Threaded Inserts are perfect for 3D printed parts. They work with popular printers like Anycubic and Prusa.
Heat or ultrasound easily sets these inserts. They fit firmly and last long.
These brass inserts are lead-free and work with many plastics. The set includes 50 pieces, each 8.1 mm long.
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Perfect For:
These M4 threaded inserts are perfect for 3D printing enthusiasts who want to strengthen their plastic parts. They’re easy to use and work with many types of plastics, making them ideal for DIY projects.
Ready to Purchase?
3. HANGLIFE Heat-Set Threaded Inserts, M4 Heat Set Insert for 3D Printing Components and Plastic Parts – Brass Metric Knurled Nuts (100 Pieces)

HANGLIFE Heat-Set Threaded Inserts are perfect for 3D printing. They fit seamlessly into your projects, making them stronger and more functional.
These brass inserts are durable and corrosion-resistant. They work with all thermoplastics and are easy to install.
The M4x6x6 set includes 100 pieces, ideal for various applications. Find the perfect fit for your needs with HANGLIFE.
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Perfect For:
HANGLIFE Heat-Set Threaded Inserts are perfect for 3D printing fans and makers who want strong, reliable parts. They work great for anyone using plastics like PLA, ABS, or PETG.
Ready to Purchase?
4. 120pcs 3D Printing Brass Nuts, M4x6x6mm Threaded Heat Set Inserts M4 Knurled Brass Nuts Heat Embedment Nut for 3D Printing Parts Loptop Automotive Plastic Shell

These 120-piece brass nuts are perfect for 3D printing projects. Each nut is M4x6x6mm, ideal for strong, lasting connections in plastic parts.
Made of premium brass, they resist heat up to 300°C and won’t break easily. Installation is simple: heat and press into holes for a secure fit.
Wide use: laptops, cars, 3D printers. Fit PLA, ABS, PETG plastics. Knurled design grips tightly, preventing slips.
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Perfect For:
This product is perfect for 3D printing hobbyists and DIY builders needing strong, durable nuts. Premium brass and high-temperature resistance ensure reliable use in automotive, electronics, and plastic projects.
Ready to Purchase?
5. uxcell Knurled Insert Nuts, 50pcs M4 x 4mm L x 6mm OD 3D Printing Brass Nuts Female Threaded Inserts Brass Heat Set Insert Embedment Nuts

The uxcell Knurled Insert Nuts are made of brass. They are strong, durable, and resistant to heat and corrosion. This makes them perfect for long-lasting use in different projects.
These nuts have a smooth surface and are easy to install. They are designed with a guide, so no counterbore or countersink is needed. The embossing process ensures they stay securely in place.
These nuts come in a set of 50 pieces. They are ideal for 3D printing, electronics, and circuit boards. Use them for tight fixing in various applications.
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Perfect For:
These uxcell Knurled Insert Nuts are perfect for 3D printing enthusiasts, engineers, and makers who need reliable and durable brass nuts for their projects. They’re easy to install and stay firmly in place, making them ideal for tight fixing in plastic parts, electronics, and circuit boards.
Ready to Purchase?
6. 150 Pcs M4 Threaded Inserts for Plastic with Heat Set Tip,M4*(6mm-10mm Hight)*5.5mm Heat Set Inserts Kit,Brass Inserts for 3D Pringting

Upgrade your 3D printing projects with these M4 threaded inserts. They’re perfect for plastics like PLA, ABS, and PETG. The included heat set tip makes installation easy.
Made from premium lead-free brass, these inserts are strong and durable. They handle high temperatures (over 300°C) without breaking. The knurled grip ensures a secure fit every time.
Organized kit, clear labeling, 24-month warranty. Everything you need for hassle-free use.
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Perfect For:
This 150-piece M4 threaded insert kit is perfect for 3D printing enthusiasts and makers who need strong, reliable connections in their plastic parts. It’s easy to use and works great with PLA, ABS, and PETG materials.
Ready to Purchase?
7. Ktehloy 400Pcs Threaded Inserts, M2 M2.5 M3 M4 M5 M6 Female Thread Metric Knurled Nuts Assortment Kit, Brass Heat Set Insert for Plastic and 3D Printing Components (Threaded Inserts Ket)

Get 400 threaded inserts for your projects. These are made of brass and come in sizes M2 to M6. They are perfect for plastic and 3D printing.
These inserts are made from high-quality brass, offering great durability and heat resistance. They won’t break or bend easily, even in high temperatures.
Installation is super easy using heat or ultrasonic methods. They provide a strong and stable connection for all your plastic parts.
| Pros | Cons |
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Perfect For:
Perfect for 3D printing enthusiasts and professionals, this kit is ideal for anyone working with thermoplastics like PLA, PETG, ABS, PPS, or PP. Whether you’re crafting automotive parts, laptop shells, or injection-molded components, these high-quality brass inserts ensure strong, reliable connections every time.
Ready to Purchase?
8. ruthex M4 Threaded Inserts Short – 50 Pieces RX-M4Sx4.0 Brass Heat Set Insert for Plastic Parts – Metric knurled Nuts – Insert by Heat into 3D Printing Components

The ruthex M4 Threaded Inserts Short are made for 3D printed parts. They fit easily into holes using heat or ultrasonic tools.
They hold firmly. They are easy to use. They fit many plastics.
These inserts are made of lead-free brass. They are durable and reusable.
| Pros | Cons |
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Perfect For:
Perfect for 3D printing hobbyists, makers, and engineers needing strong threads in plastic parts. These brass inserts fit M4 screws and install easily with heat or ultrasound into PLA, PETG, ABS, and other thermoplastics. They offer a firm grip, corrosion resistance, and can be reused for lasting, reliable fastening.
Ready to Purchase?
9. Aoserge 100Pcs M4 Brass Heat Set Inserts – Premium Knurled Threaded Nuts for 3D Printing, Plastic Parts & DIY Projects, High-Temperature Resistant, Easy Heat Installation(M4x6x6mm)

Aoserge M4 Brass Heat Set Inserts are premium brass nuts made for long-lasting use. They fit perfectly with M4 designs and are strong against deformation.
These knurled brass nuts are easy to install with a soldering iron. They work smoothly in 3D printing, woodworking, and plastic parts, saving time and effort.
Bulk pack of 100 inserts for multiple projects. Corrosion-resistant and reliable for all your needs.
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Perfect For:
Perfect for makers, workshops, and DIY enthusiasts, these M4 brass heat set inserts are ideal for anyone working with 3D printing, plastic parts, or woodworking projects. They’re easy to install and built to last, making them a reliable choice for strong, durable connections.
Ready to Purchase?
10. Ktehloy 100Pcs M4 Heat Set Inserts, Metric knurled Nuts Brass Heat Set Insert for Plastic Parts,Insert by Heat into 3D Printing Components (M4xL6xD6)

Ktehloy 100Pcs M4 Heat Set Inserts are perfect for 3D printing projects. They come in a pack of 100, making them ideal for multiple uses.
Made from high-quality brass, these inserts are strong and durable. They resist heat up to 300°C / 572°F, ensuring they last long. The 45-degree knurling adds extra strength for better fastening.
These inserts are easy to install with a soldering iron. They work well with all thermoplastics, like PLA, ABS, and PETG. Use them for 3D prints, electronics, or automotive parts.
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Perfect For:
Perfect for 3D printing enthusiasts and professionals, these M4 heat set inserts are ideal for anyone working with plastic parts. Whether you’re assembling components or enhancing durability, they offer reliable and easy-to-use solutions.
Ready to Purchase?
Buying Guide
M4 brass inserts make your 3D printing and plastic parts stronger. They ensure a secure fit every time.
Choosing the best M4 brass inserts can be tricky. Here’s a simple guide to help you pick the perfect ones for your projects.
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Material Quality:
Look for premium brass inserts. They are strong, durable, and resist heat and corrosion. -
Size and Fit:
Check the dimensions (like M4x6x6mm) to ensure they fit your project. Knurled designs grip tightly and prevent slipping. -
Installation Method:
Choose inserts that are easy to install. Heat or ultrasonic methods are common and work well with thermoplastics. -
Quantity:
Decide how many you need. Packs range from 50 to 400 pieces, so pick one that matches your project size. -
Compatibility:
Ensure the inserts work with your materials, like PLA, ABS, or PETG. Some are also great for electronics or automotive parts. -
Temperature Resistance:
For high-heat projects, pick inserts that handle temperatures over 300°C. This ensures they won’t break or deform. -
Brand and Warranty:
Trusted brands often offer warranties or organized kits. This adds reliability and ease of use.
With these factors in mind, you’ll find the best M4 brass inserts for your needs. Upgrade your projects with confidence!