100pcs M3 Brass Knurl Insert Nuts – Copper Embedded Fasteners

100pcs M3 Brass Double-Pass Knurl Insert Nuts – Reliable Embedded Fasteners for Metalworking & DIY

Upgrade your metalworking and DIY projects with these premium M3 Brass Copper Knurl Insert Nuts. Designed for a secure, vibration-resistant embedded fit, these double-pass knurled fasteners provide a strong threaded connection in plastic, wood, and soft metal applications. Available in multiple lengths — M3×4, M3×5, M3×6, M3×7, M3×8, M3×10, and M3×12 — this 100-piece set gives you versatile coverage for a wide range of projects.

Made in Mainland China.

Key Features

• Material: High-quality copper/brass for excellent conductivity, corrosion resistance, and durability
• Double-Pass Knurl Design: The knurled outer surface bites firmly into the host material for a secure, no-slip hold
• Thread Size: M3 — compatible with standard M3 screws and bolts
• Multiple Lengths: Includes M3×4, M3×5, M3×6, M3×7, M3×8, M3×10, and M3×12 variants
• 100-Piece Set: Generous quantity to keep your workshop well-stocked
• Wide Application: Ideal for 3D printing parts, plastic enclosures, PCB assemblies, furniture, and more
• Heat-Set or Press-Fit Compatible: Can be inserted using a soldering iron (heat-set) or arbor press

Specifications

What Are Knurl Insert Nuts?

Knurl insert nuts (also called threaded inserts or embedded nuts) are press-fit or heat-set fasteners that create a permanent, strong metal thread inside softer base materials like plastics and composites. The knurled outer surface grips the surrounding material tightly, preventing pull-out or spin, even under repeated assembly and disassembly cycles.

Ideal For

• 3D-printed enclosures and housings
• Plastic panels and covers
• Electronic device assembly
• Furniture and woodworking joints
• RC car and drone builds
• General metalworking and fabrication

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Frequently Asked Questions

Q: What materials can these M3 brass knurl insert nuts be used with?

A: These brass knurl insert nuts work best with thermoplastics (such as PLA, ABS, PETG), soft wood, and composite materials. They can be heat-set into plastic using a soldering iron or pressed in using a press tool for a firm, lasting threaded connection.

Q: How do I install these copper insert nuts?

A: For plastic applications, use a temperature-controlled soldering iron to gently heat the nut and press it flush into a pre-drilled hole. The brass heats quickly and melts into the surrounding plastic as it cools, creating a strong bond. Alternatively, a bench press or arbor press can be used for a cold press-fit installation.

Q: Are all seven lengths included in one pack of 100 pieces?

A: The listing offers M3 knurl insert nuts in multiple length options (M3×4, M3×5, M3×6, M3×7, M3×8, M3×10, M3×12). Please select your preferred length at the time of purchase. Each 100-piece pack corresponds to the chosen length variant.

Q: Why choose brass/copper over steel insert nuts?

A: Brass and copper offer excellent corrosion resistance, good thermal conductivity for heat-set installation, and are gentle on plastic housings. They provide a reliable threaded anchor without the risk of cracking brittle materials that harder steel inserts might cause.

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.