The designer is unavailable right now. I, too, would say FNPT = Female NPT. The company that I work for routinely uses it to mean this. The "correct" (i.e. standard) shorthand would be NPT (F). As everyone has indicated FNPT is Female National Pipe thread Tapered, and conversely MNPT is Male National Pipe thread Tapered.What's the difference between mnpt and FNPT pipe thread?
As everyone has indicated FNPT is Female National Pipe thread Tapered, and conversely MNPT is Male National Pipe thread Tapered. I run across this all the time in the oil fields. You do know there is a straight pipe thread too?... NPS Good Luck!...How to determine NPT ( National Pipe thread ) size?
How to Determine NPT (National Pipe Thread) Size Male NPT is denoted as either MPT or MNPTFemale NPT is either FPT or FNPT Pipe thread sizes do not refer to any physical dimension. The outside diameter of each pipe fitting must be measured and compared to the table for size identi-fication.Which is a variation of the NPT thread?
"A variation of the NPT thread that is used for hydraulic purposes is the Dryseal ANSI Standard Taper Pipe Thread (NPTF). This thread has the same form and dimensions as the NPT thread, except that the truncation of the crests and roots is changed to ensure that the spiral clearance around the thread is eliminated.