M5 Threaded Inserts - 50 Pieces RX-M5x9.5 Brass Heat Set Insert for Plastic Parts - Metric knurled Nuts - Insert by Heat into 3D Printing Components

Great product. Works as intended. Easy to heat with a soldering iron. No special tip required, just a large cone tip.

Buy these, no matter what.You’ll regret buying from others, promise.I use thousands of these for my products for customers. They are essential to my business. I recently tried to buy another brand that was a little cheaper and it was a bad mistake. About half of them have damaged or defected threads, but you don’t know until after you try a screw in them. This has caused me many failed prints, a lot of money wasted. All because I tried to save a few bucks. I will never go to any other brand, this is literally the only one I trust.I don’t leave reviews, but after the nightmare with the other brand that starts with a U, I felt it was imperative I help out others.Don’t buy anything else.

These work really well in 3D-printed knobs for photography equipment (light stands, etc.). I also used them to 3D-print a broken knob on an old steelcase keyboard tray I like.

these work great. east to install and hold great

Let me just say this—if you’re printing enclosures or mounts and not using threaded inserts like these… you’re playing life on hard mode.I’ve burned through enough 3D prints to know that tapping straight into PLA or PETG is like trusting a paper towel in a hurricane. That’s where these ruthex M3 inserts come in and save the day like some kind of tiny, brass-threaded Avengers.These things heat-set like butter. No deformation, no bulging, no “oops, pushed too far” drama. The knurling bites in just right, and they seat clean at the recommended temps. I used a Weller iron with a blunt tip, hovered around 210–220°C, and every single one went in textbook perfect. No cracking, no misalignment.They don’t back out when you unscrew either. I’ve tested that plenty—over-tightening, removing and re-seating a half-dozen times—and they still hold strong like it’s their first day on the job.And the RX series? 👌 These aren’t your dollar-store “sorta fits” inserts. These are precision made. Consistent sizing, clean threads, and they ship in a plastic box that doesn’t explode open like it’s trying to test your patience.What I Like:Insertions are clean, controlled, and oddly satisfyingNo burrs or malformed pieces—every single one was usableThreads hold torque like a champ, no pull-outsruthex isn’t playing around—these are real-deal engineered, not sketchy mass-stamped junkWhat Could Be Better:Honestly? Include a small tool or press-fit guide for new users maybe. That’s all I got.Oh, and maybe a reminder that yes, they are hot after heat-setting (ask my thumb)TL;DR:If you’re printing anything that needs to be unscrewed more than once, stop relying on melted plastic holes and upgrade your builds. These ruthex M3 inserts are rock solid, heat-set clean, and make your prints look and feel pro.Your future self (and your screwdriver) will thank you.

Quality inserts, but the case came with no latch to keep it closed, so It's pretty much useless.

They work perfect. I appreciate the sizing guide on the front of the package. They fit perfect everytime.

Inserts for 3D printing. Hold in tight and haven't broken. Need this to keep cases together.