Brass Heat-Set Inserts - #4-40 x 0.135" (50pcs)


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Stock Availability
3 in 9 working days


Stock code: SPX-14617

Heat set brass inserts allow a user to add mounting holes and hardware to any 3D printed or soft plastic enclosure. Use the heat set tips with your soldering iron to heat the brass inserts and then gently push them into place.

Heat set inserts are brass nuts that are specially designed to be heated up and pressed into an undersized hole. The outside of the insert has spikes and fins that help the plastic flow around and form a tight bond with the surrounding material. While standard hex nuts can be used these brass inserts have much greater rigidity.

These inserts work with common 4-40 screws and come as a bag of 50pcs. We recommend using a No.24 drill to create a 0.152" hole to press the insert into.



  • Drawing
  • Outside Diameter: 4.37mm
  • Length: 4.37mm
  • 4-40 Thread
  • Suggested hole size is 0.152" (No. 24 drill)

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