220-Piece Brass Heat Insert Nut Set M2–M6 | Knurled Thread Inserts
220-Piece Brass Heat Insert Nut Set M2–M6 | Knurled Thread Inserts
220-Piece Brass Heat Insert Nut Assortment – M2 to M6
Upgrade your 3D printing, woodworking, and DIY projects with this comprehensive 220-piece brass heat insert nut set. Covering six popular thread sizes — M2, M2.5, M3, M4, M5, and M6 — this assortment gives you everything you need to create strong, durable threaded connections in plastic, wood, and composite materials.
Why Choose Brass Heat Insert Nuts?
Brass heat insert nuts (also called hot melt embedment nuts or knurled thread inserts) are pressed into pre-drilled holes using a soldering iron or heat-set tool. As the surrounding material cools, the knurled double-twill exterior locks the nut firmly in place, delivering a reliable metal thread in even soft substrates. No more stripped plastic threads — just solid, reusable connections every time.
Key Features
- 220-piece assortment — six sizes: M2, M2.5, M3, M4, M5, M6
- High-quality copper/brass construction — excellent thermal conductivity for easy installation and long-lasting corrosion resistance
- Knurled double-twill exterior — maximum pull-out and torque resistance once set
- Heat-set installation — works with any soldering iron or dedicated heat-set tip
- Wide compatibility — ideal for PLA, ABS, PETG, resin prints, plywood, MDF, acrylic, and more
- Organized assortment kit — sorted by size for fast access during builds
Specifications
| Thread Sizes | M2, M2.5, M3, M4, M5, M6 |
| Total Pieces | 220 |
| Material | Brass (Copper alloy) |
| Installation Method | Heat-set (soldering iron / heat tip) |
| Country of Origin | Made in China |
Perfect For
- 3D-printed enclosures, brackets, and functional parts
- RC car and drone body panels
- Electronics project enclosures and PCB housings
- Woodworking and furniture assembly
- Maker and prototyping labs
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Frequently Asked Questions
Q: What tool do I need to install brass heat insert nuts?
A: You can use a standard soldering iron fitted with a flat or dedicated heat-set tip. Simply heat the nut and press it into a pre-drilled hole sized to match the outer diameter of the insert. The brass conducts heat evenly, making installation quick and clean.
Q: What materials are these heat insert nuts compatible with?
A: These brass embedment nuts are compatible with most thermoplastics used in 3D printing — including PLA, ABS, PETG, and ASA — as well as soft wood, MDF, plywood, and acrylic sheet. They are not recommended for metal substrates where traditional tapping is more appropriate.
Q: How many nuts of each size are included in the 220-piece set?
A: The 220-piece assortment is distributed across six thread sizes: M2, M2.5, M3, M4, M5, and M6. The mix is designed to cover the most commonly used insert sizes in 3D printing and general DIY projects, ensuring you always have the right size on hand.
Q: Are these nuts reusable?
A: Once a brass heat insert nut is embedded and the surrounding material has cooled, the threaded insert itself remains permanently in place. The bolt or screw that threads into it can be removed and re-inserted many times, making the connection fully reusable.