Got a 3D printed or plastic part that needs a solid thread? These J&J brass inserts are your answer. They're the STKB-0420 model: thru-threaded (meaning the thread goes all the way through), straight-walled, and designed to be molded right into your part or pressed into a straight hole. The specs are 9.9mm outer diameter, 7.9mm length, with a 1/4-20 internal thread – super common for strong fastening. Made of solid brass, so they're durable and won't strip easily. This pack gives you 25 pieces, perfect for a project or to keep in your workshop. They're essential for adding reliable, metal threads to plastic assemblies, whether you're into RC cars, robotics, prototyping, or any DIY build. Just heat them up (with a soldering iron) and press them in, and you've got a professional-grade threaded point.
