M3 Brass Heat Set Threaded Inserts M3x5x4 for 3D Printing – 20pk
M3 Brass Heat Set Threaded Inserts M3x5x4 for 3D Printing – 20pk
Upgrade your 3D prints and injection-moulded projects with these M3 Knurled Brass Heat Set Threaded Inserts. Precision-machined from high-quality copper alloy, these gold-toned inserts deliver rock-solid thread retention in plastic housings — perfect for Voron 2.4 builds, FDM 3D printer enclosures, and DIY fabrication projects. Each pack contains 20 pieces of M3x5x4 inserts.
Key Features
- Material: High-quality brass (copper alloy) — high hardness, no deformation, durable and long-lasting
- Size: M3 x 5mm (length) x 4mm (outer diameter)
- Color: Gold
- Knurled exterior: Provides superior grip and pull-out resistance once embedded in plastic
- Guide pilot design: No need to counterbore or countersink the boss hole — the built-in guide pilot makes alignment effortless
- No back-drilling required: The valve conduit design eliminates back-drilling and counter-sinking for fast, clean installation
- Versatile installation: Compatible with heat-press (soldering iron), ultrasonic insertion, or in-mould injection methods
- Heat resistant: Maintains integrity under the thermal conditions of heat-set installation and repeated use
- Pack quantity: 20 inserts per pack — great value for prototyping and production runs
Ideal Applications
- Voron 2.4 & other CoreXY 3D printer builds
- FDM printed enclosures, brackets, and housings
- Injection-moulded plastic parts
- RC car bodies, drone frames, and DIY electronics enclosures
- Robotics, prototyping, and maker projects
Installation Guide
- Print or drill a 4mm pilot hole in your plastic part.
- Position the insert over the hole using tweezers or a dedicated heat-set tip.
- Apply gentle heat (soldering iron set to ~200–230°C) and press the insert flush into the plastic.
- Allow to cool fully before threading in your M3 bolt — enjoy a strong, repeatable connection.
Made in Mainland China.
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Learn more: OSHA guidance on hand and power tools
Frequently Asked Questions
Q: What size hole should I print for M3x5x4 brass heat set inserts?
A: For best results, design or drill a hole of approximately 4.0–4.2mm diameter in your plastic part. The knurled outer surface of the M3x5x4 insert grips the surrounding plastic as it is pressed in, creating a strong, secure thread anchor.
Q: Are these brass heat set inserts compatible with the Voron 2.4 3D printer build?
A: Yes! These M3x5x4 knurled brass threaded inserts match the standard specification called for in Voron 2.4 and many other CoreXY and cartesian 3D printer builds that use heat-set inserts in printed parts.
Q: Can I install these without a specialised soldering iron tip?
A: You can install them using a standard soldering iron set to around 200–230°C, though a dedicated heat-set tip provides a more controlled, flush result. Alternatively, these inserts support ultrasonic installation or in-mould injection for industrial applications.
Q: How many inserts come in one pack?
A: Each pack contains 20 pieces of M3x5x4 brass heat set threaded inserts — great for single builds or small batch production runs.