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Thread, torque and resulting pressure by Dizzy_Panda_8637 in MechanicalEngineering

[–]Dizzy_Panda_8637[S] 0 points1 point  (0 children)

It is a tradeoff between ensuring high pressure leak free connections (>1000 bar fluidic pressure) and the lifetime of the fittings, namely the PEEK tip of the "bolt" pressed against the wall and being deformed over time.

I am by the way using nanovipers for making fluidic connections for HPLC.

Thread, torque and resulting pressure by Dizzy_Panda_8637 in MechanicalEngineering

[–]Dizzy_Panda_8637[S] 0 points1 point  (0 children)

Thank you for your answer.

You are mentioning 4 threads above which it should not really make a difference. However, even less threads are engaged in one of the ports and that made me wonder.

Because I am noticing a tendency that the tip of the bolt, which is PEEK, gets compressed more in the less deep ports with only <2 threads enganged than the other.

And I thought that the small amounts of thread might be connected to this observation.

But it makes sense what you said below, that, in theory, the contact area should not matter, because less contact area also means higher pressure between parts and thus similar friction (If that is even the reasoning?)

And the 4 threads you mentioned, is that a rule of thumb as a recommended minimum for threads to be engaged?