Recent Posts. In this day and age of a world driven by constantly changing technology -the security of your inform …. NPT vs. Pipe Fittings. Do NPT threads need sealant? Is NPT thread tapered? What does MNPT stand for? Male National Pipe Thread. How do you determine your fitting size? Measure the Outside Diameter OD of your pipe or pipe fitting:. Wrap a string around the pipe. What does MPT stand for? What is Npsm thread? What is an MNPT fitting? When we read this we see that the writer never stated that NPT threads were designed to use no sealant, but in fact designed to have clearance in the thread profiles.
NPTF when manufactured properly, are designed to be like a crush washer, with engineered deformation forming the seal barrier. You are an idiot. That is clearly stated above in the article.
Not saying which is correct but i do know that using teflon as a sealant is also a lubricant which would reduce run down torque effort. In effect you will be deforming the thread metal further to make a tighter seal.
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