Brass Threaded Insert Knurled M3

High-quality knurled brass threaded inserts designed for heat-set installation into thermoplastics, providing durable metal threads in 3D printed parts, plastic enclosures, and injection-molded components. These M3 inserts feature a diamond-knurled outer surface that melts into plastic when heated, creating a permanent, high-strength threaded anchor point that withstands repeated screw insertion and removal cycles far better than self-tapping screws or plastic threads.

Available in multiple length configurations to suit various wall thicknesses and application requirements. The brass construction offers excellent corrosion resistance and superior thermal conductivity for efficient heat-set installation using soldering irons. Perfect for 3D printing projects, robotics assemblies, electronic enclosures, and prototype development where reliable threaded connections are essential. Compatible with standard M3 metric screws and bolts. The knurled pattern ensures excellent pull-out resistance and rotational stability. Installation requires a soldering iron or dedicated heat-set insert tool set to appropriate temperature (typically 200-240°C for PLA, higher for ABS/PETG).

Specifications:

• Thread Type: M3 Metric Internal Thread
• Thread Pitch: 0.5mm (standard M3)
• Material: Brass (CuZn alloy)
• Surface Finish: Knurled (diamond pattern)
• Installation Method: Heat-set (thermal insertion)
• Outer Diameter Options: 4.2mm, 4.5mm, 5mm
• Length Options: 3mm, 4mm, 5mm, 7mm
• Available Sizes:
  • M3×3×4.2 (Length×OD: 3mm×4.2mm)
  • M3×5×4.2 (Length×OD: 5mm×4.2mm)
  • M3×7×4.2 (Length×OD: 7mm×4.2mm)
  • M3×3×4.5 (Length×OD: 3mm×4.5mm)
  • M3×5×4.5 (Length×OD: 5mm×4.5mm)
  • M3×7×4.5 (Length×OD: 7mm×4.5mm)
  • M3×4×5 (Length×OD: 4mm×5mm)
  • M3×5×5 (Length×OD: 5mm×5mm)
  • M3×7×5 (Length×OD: 7mm×5mm)
• Compatible Screw: M3 metric screws/bolts
• Recommended Hole Size: 4.0-4.5mm (depending on OD and plastic type)
• Installation Temperature: 200-240°C (PLA), 240-270°C (ABS/PETG)
• Applications: 3D printed parts, plastic enclosures, robotics, electronics, prototypes