ruthex M3 Threaded Inserts - 100 Pieces RX-M3x5.7 Brass Heat Set Insert for P...

Overall, I’m very happy with these heat inserts. They shipped quickly and arrived in good condition with no issues. In use, the machining appears to be high quality and the knurling is clean and consistent. Screws thread in smoothly without binding or cross-threading. I primarily use these for 3D printed parts and have not experienced any fitment or durability problems. They perform exactly as expected and I would recommend them to anyone installing threaded inserts in 3D prints.

Quality product that works as expected/as advertised.

Right size easy to work with good value

Went through the pack in a week. Very high quality and the specs on the front are exact especially for 3d prints. Great value and they fit great and are very strong. I used them for an outdoors application and they are showing no wear or movement.

I bought to have on hand for some planned projects. I tested a couple and they work fine.

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 satisfying No burrs or malformed pieces—every single one was usable Threads hold torque like a champ, no pull-outs ruthex isn’t playing around—these are real-deal engineered, not sketchy mass-stamped junk What 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.

This is going to sound trivial, but it didn’t come with the setting tip. These are some great inserts that work amazingly well. The fit is unmatched. I’ve tried other inserts and a lot of the cheaper ones have some sort of issue, either they don’t sear properly for some reason or they have burs or the threads either aren’t there or are cross threaded. The only thing that would make these better is if they came with the tip, otherwise great value.

As described and worked great !

Good product

İyi ürün

Kanon, håller i plasten när man värmt dem på plats, så helt kanon

Parfait. fait le travail.

I use these in every single 3D printed enclosure I design and they are perfect. Just finished off a bag of M3's and I've ordered some M4 and M5