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Your cart is empty.[ J&J Products ] 4-40 Brass Insert 100pcs, 0.179 in OD, 0.135 in Length, Female 4-40 Thread, Press Fitting or Injection Molding Type, 100 pcs
Seamus
Reviewed in the United States on September 4, 2023
Brass heat-set inserts are great for adding durable threads to 3D printed parts. Design a 4mm hole into the part where I want the insert to go. There are heated tools and jigs to embed the inserts perfectly square, but I usually just thread the insert onto a bit of threaded rod or a long 4-40 screw, heat it slightly with a butane torch, melt it into the part, then unscrew the rod. Works great, and the threads don't chew out the way that threading directly into the plastic does. A bit of heat and they can be pulled out of old prototypes to be reused, as well.
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