Heat-Set Threaded Inserts (M4 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. These M4 inserts have M4x0.7mm metric threads.  Need a different thread size? We have more inserts available here, including an assortment box with 10 different sized inserts.   Insert Specifications: Maximum Insert Diameter:                  0.250" (~6.35mm) Tapered End Diameter:                         0.