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Tool Talk Discussion Forum

Hydraulic fittings

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Joe (Wa)

12-13-2004 11:02:33




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What does the "F" in male pipe NPTF fittings stand for?

Joe




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Joe (Wa)

12-13-2004 18:18:22




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 Re: Hydraulic fittings in reply to Joe (Wa), 12-13-2004 11:02:33  
Thanks guys.



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Dave (IL)

12-13-2004 11:40:46




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 Re: Hydraulic fittings in reply to Joe (Wa), 12-13-2004 11:02:33  
A number of variations of the NPT thread has been introduced to overcome the problem of spiral leakage and they are generally known as Dryseal threads. (Covered by the SAE standard J476). The best known is the NPTF (the F standing for fuel). In this thread design, the root diameter has been increased so that when the internal and external threads are screwed together, there is an interference fit between the crest of one thread and the root of the other so as to seal against spiral leakage. (Figure 3).

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Bob

12-13-2004 11:37:14




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 Re: Hydraulic fittings in reply to Joe (Wa), 12-13-2004 11:02:33  
It's a $exual thing. It means "FEMALE". (Internal thread.)



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