Heat-Set Threaded Inserts (4-40 Threads)
Heat-Set Threaded Inserts are a great option for 3D printed parts or making repairs to any thermoplastic part. They provide a much stronger connection than simply threading screws into the plastic. Brass will also last much longer than plastic threads and is less likely to cross thread which makes them ideal for parts that are assembled and disassembled often. These inserts can be easily and quickly installed by heating them with a standard soldering iron on a low-heat setting and using the soldering iron's tip to press the insert into place. The melted plastic will flow around the knurls and ridges on the insert as it is pressed in and solidify when cool, locking it in place.
For optimum strength the manufacturer recommends that the tapered inserts should be used in holes designed with an 8° total taper to the sides. We find that due to the irregular surface finish from 3D printed layers that these inserts are very forgiving and will work well in holes designed with straight sides as well. All of our #4 inserts are tapped for #4-40 ANSI threads.
- Maximum Insert Diameter: 0.172" (4.37mm)
- Minimum insert Diameter: 0.157" (~3.99mm)
- Optimum Hole Size: ~0.159" to 0.153" (4.04mm to 3.89mm) 8° taper.
- Length: 0.135" (~3.43mm)
- Minimum Recommended Side Wall Thickness: 0.093" (2.36mm)
- Vanes: 1
- Material: Brass
Design tips for using Heat-Set threaded inserts
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