Stock your workshop with the complete range of heat set inserts you’ll ever need with this Heat Set Insert Set. This value pack contains 760 pieces spanning every common metric size from M2 to M8, plus a bonus pack of 1/4″-20 imperial inserts, giving you everything necessary to create delicate electronics enclosures to heavy-duty structural mounts covered in one box.
The heat set inserts in the Heat Set Insert Set are machined from high-quality, lead-free and cadmium-free brass, every insert in the set features the same double-knurled outer surface for maximum pull-out and rotation resistance, and a tapered pilot end for fast, accurate alignment during installation. Simply heat with a soldering iron (roughly 10–20 °C above your printing temperature) and press into a pre-sized hole — the insert melts cleanly into the plastic and fuses in place as it cools, creating a strong, low-friction metal thread that can be screwed and unscrewed repeatedly without wearing down the surrounding material.
Whether you’re prototyping, running a Voron or other 3D printer build, assembling RC parts, or producing finished products for sale, this Heat Set Insert Set means you’re never caught without the right size on hand.
Why choose the Heat Set Insert Set:
- Complete size range – M2 through M8 metric, plus a bonus 1/4″-20 pack, in one kit
- High-quality brass – lead-free and cadmium-free for a safer, premium-grade material
- Enhanced durability – reinforces threaded holes and dramatically increases the strength and lifespan of the connection
- Reliable assembly/disassembly – parts can be screwed together and taken apart many times without stripping
- Professional finish – clean, flush results for both DIY and commercial projects
- Great value – buying the full range as a set works out cheaper per piece than purchasing individual sizes separately
This Heat Set Insert Set is perfect for makers, workshops, and small businesses who need a dependable, ready-to-go supply of heat set inserts across every common size.
What’s in the Package:
- 100 x M2x3mm Heat Set Inserts
- 100 x M2.5x4mm Heat Set Inserts
- 100 x M3x3mm Heat Set Inserts
- 100 x M3x5.7mm Heat Set Inserts
- 50 x M4x4mm Heat Set Inserts
- 50 x M4x8.1mm Heat Set Inserts
- 50 x M5x5.8mm Heat Set Inserts
- 50 x M5x9.5mm Heat Set Inserts
- 20 x M6x12.7mm Heat Set Inserts
- 20 x M8x12.7mm Heat Set Inserts
- 100 x M3x5x4mm Heat Set Inserts (Voron Spec)
- 20 x 1/4″-20 Imperial Inserts
The Heat Set Insert Set features 760 pieces total, packaged in labelled compartments/bags by size for easy organisation and storage.


