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type di filetto npt

  • Thread starter Thread starter lollo76
  • Start date Start date

lollo76

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Good morning to all,
Since I found nothing that explained the differences to me, I ask who is more experienced than me what kind of thread is npt.
in particular I need to know if 1/8" is the same as 1/8"npt (the only thing I know is that npt is conical). .
thanks to those who will intervene. .
 
npt is a thread that is practicing the international standard in the petrochemical/offshore field. are not equal to conical gases even if they are very similar (and in some cases compatible). are threads that, if performed correctly, should be stagnated even for late pressure in the field of hydraulics.
 
from what I know (although it is not my intention to contradict zeigs) are always conical and always tight.
 
Meanwhile thank you for the answers. but therefore a normal fitting of 1/8 does not enter into 1/8ntp. I have seen from the pdf linked that the difference lies in the step of threads. . .
 
You're right, I read bad, cylindricals are nps. but from the pdf I linked it seems that the nptfs are to be held, while the nptr do not guarantee it
I was told by one of the climbers (!) that the difference between npt and nptf (therefore the sigles are to be taken with the pliers) is in the fact that nptfs have, in the male, the crest to edge live, that therefore plasticize on the bottom of the throat tightening the fitting and create the seal, while npt(r?) no and therefore do not guarantee it and must intervene with teflon or other

I would say yes, an iso connection does not enter

from the bottom of my personal experience I have always put the npts where I can not or would be uncomfortable to create the lamatura for the bonded, and in case I have problems of positioning the fittings (half more lap the npt me allows it, the cylindrical gas no), in other cases I prefer the gases, which spoil less the thread to the assembly and create less tensions in the material (it has already happened to split of the brass bodies npt going to
 
always if not mistaken npt.f would simply stand for female thread (female) and npt.m obviously for male thread (male). Usually in my sector some customers, especially the Norwegians of the oil industry, notoriously accurate and related to the regulations, ask for npt and demand it without teflon on the fillets because they want the perfect seal. in this case we only take npt fittings from superreferential suppliers (we all know them, then I don't lose both the case of advertising here)
 
So I have my problem.
I have to insert a pressure sensor inside an aluminum plate. the sensor has male thread 1/8npt conical and the aluminum plate has 3 holes.
in the package of the aluminum plate, the company that supplied me, included a bag with 3 aluminum screws (which act as a cap) with a label with writing 1/8npt.

from here I assume that the holes on the aluminum plate are 1/8npt but... they are cylindrical.

Now between the plate and the sensor I have to put a 45° connection and I don't know if to look for it 1/8npt or 1/8 iso...
Unfortunately I am already struggling to find the 45° connection but I do not want to conduct a vain research if then I find it 1/8iso and does not enter the dish.. .
 
lollo76 said:
So I have my problem.
I have to insert a pressure sensor inside an aluminum plate. the sensor has male thread 1/8npt conical and the aluminum plate has 3 holes.
in the package of the aluminum plate, the company that supplied me, included a bag with 3 aluminum screws (which act as a cap) with a label with writing 1/8npt.
from here I assume that the holes on the aluminum plate are 1/8npt but... they are cylindrical.Now between the plate and the sensor I have to put a 45° connection and I don't know if to look for it 1/8npt or 1/8 iso...
Unfortunately I am already struggling to find the 45° connection but I do not want to conduct a vain research if then I find it 1/8iso and does not enter the dish.. .
Click to expand...
Are they cylindrical?
the conicity in the npt threads is 1°47", as from the table that was attached by the diameter of0 to the diameter of a 1/8" thread there are 3 tenths of difference and to the eye it is not very simple to evaluate. . :rolleyes:cation
p-h
 
rero said:
always if not mistaken npt.f would simply stand for female thread (female) and npt.m obviously for male thread (male). Usually in my sector some customers, especially the Norwegians of the oil industry, notoriously accurate and related to the regulations, ask for npt and demand it without teflon on the fillets because they want the perfect seal. in this case we only take npt fittings from superreferential suppliers (we all know them, then I don't lose both the case of advertising here)
Click to expand...
the norm relating to the npt threads (national pipe thread) previews two series of threads a rough (or large) series called npt; and a fine (or fine) series called nptf.

Hello, Adrian!
 
do you know how to tell me in pm some dealer who has female male fittings 1/8npt tilted to 45°?
 
ah, here, even because if the hole was conical, it only keeps if it is screwed. while with cylindrical hole and conical male, once the male comes to "make effort" just screw a fur more to have the perfect seal.
However someone knows dealers of 45° npt malefemmina fittings?
 
thread npt female to be performed as a rule of art must be performed as follows:

Cylindrical pass-by

conical mapping

conical aleration on the inside of the thread to make all the conical thread (crew and bottom) for which it is a conical thread (you can see very well also from the tables that you can find on the net).
 

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