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Threaded Inserts
The thread inserts are made of solid brass, which has excellent thermal conductivity, corrosion resistance, resistance to breakage and deformation, and are strong and will not rust
Knurled insert nuts provide tightening torque, uniform force, and smooth and tight internal threads making it firmly fixed in the accessories, achieve seamless connection, and can be used for long-term use without loosening
Brass Heat Set Insert
Instruction - Brass thread inserts can be embedded in plastic materials using the heat of a soldering iron or ultrasonic waves and can withstand temperatures over 300°C / 572°F.
Application - Brass Knurled Nuts can be used for all thermoplastic, including PLA, PETG, ABS, PP, etc. They are widely used in 3D-printed objects, injection-molded plastic parts, automotive plastic housings, laptop housings, circuit board assembly, and electronics.
RCAddiction
Reviewed in the United States on March 30, 2025
Often, the standard 4.5 mm OD inserts are just a bit too small, depending on the printed hole size in which they are heat-inserted.These come in at 4.99mm length x 5.01mm OD. That's pretty much perfect versus the stated specs. Having purchased others that were supposed to be 5mm OD only to find them at the same 4.6mm, this was a good find.The threads are smoothly cut and fit standard M3 cap head screws perfectly.Good price for decent size package as well.
Customer
Reviewed in the United States on April 6, 2025
I used these for some 3d printed knobs and a custom device I created to securely hold a cord by tightening a screw down onto it. In both cases it is important that the screw be secured well and not become loose with repeated use by wearing down the plastic. Plastic formed as thin as screw threads has strength limited by size. Since the plastic melts around the insert and then flows into the knurling sections you do not have friction on the plastic whenever tightening or loosening a screw and instead of a thin piece of plastic providing support you have metal which is gripped by plastic across the entire outer surface of the insert - much, much stronger.
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