220pcs Brass Heat Set Insert Nuts for 3D Printing – M2 M2.5 M3 M4 M5 M6 Knurled Threaded Inserts for Plastic Resin Models

This 220pcs brass heat set insert nuts kit includes knurled threaded inserts in common metric sizes (M2, M2.5, M3, M4, M5, M6), designed specifically for 3D‑printed parts and plastic or resin models. The brass heat‑set threaded inserts are ideal for creating strong, reusable screw threads in 3D‑printed enclosures, jigs, and functional assemblies, delivering far better pull‑out and torque resistance than printed threads alone.

Key Features & Specifications

• Material: High‑quality brass construction ensures corrosion resistance and excellent thread life for repeated assembly and disassembly.
• Heat‑Set Design: Threaded heat set insert nuts are installed by heating and embedding into pre‑drilled holes in 3D‑printed parts or plastic resin models, melting the surrounding material to form a secure mechanical bond.
• Knurled Exterior: Knurled threaded inserts feature a textured outer surface that grips the plastic, preventing rotation and improving retention in PLA, ABS, PETG, and similar filaments.
• Metric Sizes Included: Kit covers M2, M2.5, M3, M4, M5, and M6 threads, suitable for screws used in consumer electronics, mechanical assemblies, and 3D‑printed brackets.
• Size Breakdown (220pcs total):
  • M2x3x3.5 – 25 pcs
  • M2x4x3.5 – 25 pcs
  • M2.5x3x3.5 – 25 pcs
  • M2.5x4x3.5 – 25 pcs
  • M3x3x4 – 25 pcs
  • M3x4x4 – 25 pcs
  • M3x5x4 – 25 pcs
  • M4x4x6 – 25 pcs
  • M5x5x7 – 10 pcs
  • M6x6x8 – 10 pcs
• Application Scope: Designed for 3D printing projects, plastic and resin models, injection‑moulded‑style enclosures, and other thermoplastic assemblies where strong threaded fasteners are required.
• Concept: Brass heat set threaded inserts are the go‑to choice for reinforcing tapped holes in 3D‑printed parts, making them more durable for screws, standoffs, and mechanical hardware.

How They Work in 3D Printing Projects

When used in 3D‑printed housings, brackets, or plastic resin models, these brass heat set threaded inserts for 3D printing are typically installed with a soldering iron, heated tip, or dedicated heat‑insert tool. The brass nut is pressed into a pre‑drilled hole while hot, allowing the surrounding plastic to flow slightly around the knurled body and then solidify into a mechanically locked, metal‑threaded anchor point. This is why brass heat set insert nuts for 3D printing are widely recommended for camera mounts, mechanical kits, tool grips, and any part that will see frequent screwing and unscrewing.

Ideal For

This kit is perfect for 3D printing hobbyists, hobby CNC builds, electronics enclosures, prototype jigs, and industrial plastic parts that need reliable threaded fasteners. The assortment of M2 through M6 knurled threaded inserts lets you standardize on the same brass heat set nuts across multiple prototypes and production‑style prints, reducing the need to print and reprint threaded holes directly.

What’s Included

220pcs brass heat insert nuts (heat set threaded inserts for 3D printing) in assorted M2, M2.5, M3, M4, M5, and M6 sizes. No heating tool, soldering iron, or installation jig is included; please use a standard soldering iron or heat‑set insert tool as needed.