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Author: Subject: NPT threaded Steel Fitting to Ground Glass Joint?
LuckyWinner
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[*] posted on 14-5-2021 at 12:06
NPT threaded Steel Fitting to Ground Glass Joint?


im trying to attach a NPT threaded Steel Fitting to Ground Glass Joint 24/40 , 29/32.

I was looking for a PTFE Ground Glass Joint to NPT thread adapter but I cant seem to find one.

how do people usually do this?


Ground Glass Joint > PTFE adapter > NPT threaded steel fitting

needs to be high vacuum tight.
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monolithic
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[*] posted on 14-5-2021 at 12:11


NPT pipe --> NPT hose barb --> vacuum tubing --> 24/40 vacuum adapter?
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Fyndium
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[*] posted on 14-5-2021 at 12:26


Turn a PTFE fitting and make a screw cap for it. I'm gonna do one for my SS pot to attach all kinds of ware from droppers to stillheads to stirrers.
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LuckyWinner
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[*] posted on 14-5-2021 at 14:04


Quote: Originally posted by monolithic  
NPT pipe --> NPT hose barb --> vacuum tubing --> 24/40 vacuum adapter?


this would work BUT I need a wide opening, your method will cause a tiny opening.
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LuckyWinner
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[*] posted on 14-5-2021 at 15:31


does a 'GL' thread fit on an european 'M' thread (used for bolts and nuts usually) ?

for example:
you have a PE /PTFE 'GL 25' thred , a M25 nut could be tightly screwed on this?

[Edited on 14-5-2021 by LuckyWinner]
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draculic acid69
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[*] posted on 14-5-2021 at 18:22


Quote: Originally posted by Fyndium  
Turn a PTFE fitting and make a screw cap for it. I'm gonna do one for my SS pot to attach all kinds of ware from droppers to stillheads to stirrers.

Might want to keep the Teflon talk to yourself.
Ppl who post about that disappear.
https://www.sciencemadness.org/whisper/viewthread.php?tid=14...
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Fyndium
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[*] posted on 14-5-2021 at 22:27


I see. I haven't offered anything for sale, though, but I do have made adapters from teflon for bleeder tubes, thermometers, and lastly, I made a new locking nut for my sep funnel which had it's original missing. It was nonstandard thread, so I had to play a little and it's a bit tight, but in this instance it is only good thing. I also made multiple flange gaskets out of 1mm PTFE sheet.

Possibly a reason why people don't actually get along with these projects is because they gave up doing whatever it was, or haven't got to order PTFE stock, or are just too busy. Turning adapters for sale would be quite unprofitable to many, because it actually takes quite a lot of time with manual machinery to turn them, and plastic is also a bit tricky, although easy to machine, so running many failed parts will be unavoidable. I have noticed though that if some project is made for profit, it usually gets expedited to a significant degree, compared to just having some hobby project done, which you deem unnecessary, but possibly fun.

My SS pot project will be protracted too, because I need to re-weld the nominal thread adapters to it, and in worst case, replace the whole flange because it's too thin to hold any actual pressure. To admit it, the biggest c*ckblock is that I don't actually need the pot for anything in the close future.

[Edited on 15-5-2021 by Fyndium]
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BromicAcid
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[*] posted on 15-5-2021 at 04:18


Solid teflon stopper, drill it out, tap it, sounds like it could be a plan.



Shamelessly plugging my attempts at writing fiction: http://www.robvincent.org
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unionised
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[*] posted on 15-5-2021 at 05:53


Have you considered hot melt glue?
And if the working temperature is too high for that, have you considered thermal expansion?
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draculic acid69
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[*] posted on 16-5-2021 at 00:19


Quote: Originally posted by unionised  
Have you considered hot melt glue?
And if the working temperature is too high for that, have you considered thermal expansion?


What chemicals react/dissolve hot melt glue and which ones don't?
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draculic acid69
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[*] posted on 16-5-2021 at 00:21


Quote: Originally posted by BromicAcid  
Solid teflon stopper, drill it out, tap it, sounds like it could be a plan.


Sounds like the best way.
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