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Whats the difference NPT - NPTF

E

Errin OH

Member
I Google’d it but do not quite get it.

NPT - Nation Pipe Thread, tapered
NPTF - National Pipe Thread Fuel

They do not state the taper on NPTF but include this statement,

"NPTF threads are the same basic shape but with crest and root heights adjusted for an interference fit, eliminating the spiral leakage path."

And refer to it as a,

"Semi-compatible variant".

What does that mean? Will they mate up? I know Straight SAE will not.

Looking at a live swivel and the part states NPTF. I will be hooking up to 1” steel pipe with NPT tapered threads.
 
NPT and NPTF will work together. NPTF is an improvement over the old style. Made with as you read different crest and root size, meant so it could seal dry(no pipe dope or tape).
 
NPT American Standard Pipe Taper Thread
NPSC American Standard Straight Coupling Pipe Thread
NPTR American Standard Taper Railing Pipe Thread
NPSM American Standard Straight Mechanical Pipe Thread
NPSL American Standard Straight Locknut Pipe Thread
NPTF American Standard Pipe Thread Tapered (Dryseal)
BSPP British Standard Pipe Thread Parallel
BSPT British Standard Pipe Thread Tapered
 
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