Is the threads per inch 20?

Yes- I use one to make a custom mic mount to tripod holder

what temperature to set the soldering iron for pla and polycorbaonte ?

You need to be above the melting temperature of the filament, I usually set to 350C ( around 750F )

can this be used with a propane soldering iron?

I found that I need to apply pressure to push the insert into the melting plastic. I don't know that you can with a gas soldering iron but if the iron has a metal tip you may find that it works.

What style soldering irons is this compatable with?

In regards to brass inserts for plastic I use an old soldering iron with a chisel tip that I've blunted.

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⚡ Upgrade your 3D print game with precision heat-set inserts!

COMPLETE PRO KIT - Includes all essential sizes plus a durable adapter, straight from the USA for quality you trust.
DAMAGE FREE 3 D PRINTING - Engineered tip geometry ensures secure inserts without harming delicate plastic parts.
EFFORTLESS TIP SWAPPING - Threaded adapter lets you switch tips in seconds—no soldering iron teardown needed.
UNIVERSAL COMPATIBILITY - Works seamlessly with popular 900M and T18 soldering irons like Hakko and Weller.
PRECISION FIT FOR EVERY THREAD - 7 specialized tips cover M2 to M8 inserts for flawless heat set installation.

The ruthex 7x Soldering Tips kit offers seven precision-engineered tips for heat-setting threaded inserts ranging from M2 to M8. Featuring a quick-change threaded adapter compatible with 900M and T18 soldering irons, this USA-made set ensures damage-free, secure installation of inserts into 3D printed parts, streamlining your workflow with professional-grade versatility.

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