What is this pipe thread?
I need to make this part and I have no idea what the thread is yet. It's 1" sch 40 pipe 1.05" ID but the thread is much finer than NPT. The nipple next to it, is supposed to be 1" BSPT which I got from McMaster but it looks just as course as NPT.
Any ideas what this could be? It does appear tapered.
Single pipe 392sqft system with an EG-40 rated for 325sqft and it's silent and balanced at all times.
Comments
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Electric straight threadsDL Mechanical LLC Heating, Cooling and Plumbing 732-266-5386
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What is it off of?
If it is American, it may be national pipe tapered fuel (NPTF).
The most likely import would be, British Standard Taper Pipe Thread (BSPT)"If you can't explain it simply, you don't understand it well enough"
Albert Einstein0 -
There is NO taper on the upper thread!
Is that an O-Ring on the right?0 -
Sadly in the world I work in it's not that simple.Zman said:What is it off of?
If it is American, it may be national pipe tapered fuel (NPTF).
The most likely import would be, British Standard Taper Pipe Thread (BSPT)
I can't say what it's from, but it could literally be anything, including custom.
I'm hoping there's a fine pitch tapered thread for pipe, though. BSPT looks way too course.Single pipe 392sqft system with an EG-40 rated for 325sqft and it's silent and balanced at all times.
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That's thread locker that is left behind.pecmsg said:There is NO taper on the upper thread!
Is that an O-Ring on the right?
It's very clearly a tapered thread in person, the camera messes it up.
I work in a machine shop, if I can't tell tapered from straight I need to just go home.Single pipe 392sqft system with an EG-40 rated for 325sqft and it's silent and balanced at all times.
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Hmm,
Do you have a pitch count? You may need to break out the gages and look through countless charts..."If you can't explain it simply, you don't understand it well enough"
Albert Einstein0 -
That's what I'm hoping to avoid.Zman said:Hmm,
Do you have a pitch count? You may need to break out the gages and look through countless charts...
Luckily it doesn't need to be exact as I'm making both pieces but I was hoping it was a common thing.
Oddly enough I count 14 TPI by eye, which is the same as 3/4 NPT but not 1".
Single pipe 392sqft system with an EG-40 rated for 325sqft and it's silent and balanced at all times.
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I just have to wonder... is it metric, by any chance?Br. Jamie, osb
Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England0 -
Is it an adjustable die for 1/2 and 3/4" that was made to cut 1" thread?0
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It doesn't look like the angle or geometry of the groove is the same as NPT either. There was some sort of fine pipe thread in the US as well I think. BSPT is a different angle than NPT if I recall, but this is probably neither. Is there any reason to believe it wasn't something someone just cut on a lathe to connect the 2 parts?0
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My guess is metric taper - maybe M33 x 2.0?0
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NPS is a straight thread.Steve Minnich0
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It's straight and as far as I know it's the same pitch as NPT.Steve Minnich said:NPS is a straight thread.
Single pipe 392sqft system with an EG-40 rated for 325sqft and it's silent and balanced at all times.
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I know what it isn't and it's not a conduit thread.0
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lets see die you used to thread it. why are we guessing at this?0
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BSPT-- British Standard Pipe Thread is straight, not tapered.
NPT-- NationAL Pipe Thread is tapered.
In the picture: the top pipe looks like straight thread.
The bottom fitting from McMaster (close nipple?) looks like tapered NPT.0 -
psb75 said:BSPT-- British Standard Pipe Thread is straight, not tapered. NPT-- NationAL Pipe Thread is tapered. In the picture: the top pipe looks like straight thread. The bottom fitting from McMaster (close nipple?) looks like tapered NPT.
You're thinking of BSPP which isn't tapered.
Single pipe 392sqft system with an EG-40 rated for 325sqft and it's silent and balanced at all times.
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You are correct. My bad. BSPT is British Standard Pipe Taper and BSPP is British Standard Pipe Parallel (straight threads).
I've encountered BSPP threads on Myson panel radiators. I've even used NPT fittings on them with pipe dope and MANY wraps of tape. They did seal.
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I'm guessing this is the die that was used to thread it:
https://i.ytimg.com/vi/sYfHedtUsCs/maxresdefault.jpg2 -
mattmia2 said:I'm guessing this is the die that was used to thread it: https://i.ytimg.com/vi/sYfHedtUsCs/maxresdefault.jpg
Single pipe 392sqft system with an EG-40 rated for 325sqft and it's silent and balanced at all times.
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