Question about BSPT and NPT threads

[Eternalightwith]

Does anyone know if BSPT(Threaded) and BSP(Parallel) can be used interchangeably?

I have BIX480 with G1/4" (BSP) and I need to change it to NPT The only apapter that exists is BSPT to NPT.

They say threads are the same exactly, just diameter is tapered slightly on BSPT. So I guess I'd only be able to tighten so much. Just wanted to run it by you guys before I buy from Mcmaster.

David

P.S. Is this "crystalfonz" equable to bigNG and Aquaero?

[RedRaider]

Crystal Fontz is a very different product from either Aquaero or bigNG...

[Ricey]

BSPT and BSPP are different and cannot just be used interchangeably without regard.

BSPT is tapered and you will need silicon sealing tape to get a proper seal. NPT, a variant of BSPT is used in Swiftech barb threading.

BSPP is parallel pipe (British Standard Parallel Pipe). This is used by Thermochill barbs.

Be careful whether BSPT or BSPP because I think BSPT has 17 threads vs. 18 threads, or something like that. Using one barbs with the other may not seal well, even if you have an 0-ring gasket.

[Eternalightwith]

Yes I'm TRYING to be very careful. All these acronyms and making my brain hurt. 1/4" does not refer to ID?!? WTHell? Fucking Plumbers.:bird:


Yes I know IanY, just trying to find an adapter that will fit on my BIX on one end and NPT 3/8" on the other end without costing 13 bucks an adapter.


David


BSPT and BSPP are different and cannot just be used interchangeably without regard.

BSPT is tapered and you will need silicon sealing tape to get a proper seal. NPT, a variant of BSPT is used in Swiftech barb threading.

BSPP is parallel pipe (British Standard Parallel Pipe). This is used by Thermochill barbs.

Be careful whether BSPT or BSPP because I think BSPT has 17 threads vs. 18 threads, or something like that. Using one barbs with the other may not seal well, even if you have an 0-ring gasket.

[Snyxxx]

Yes I know IanY, just trying to find an adapter that will fit on my BIX on one end and NPT 3/8" on the other end without costing 13 bucks an adapter.

David

May I ask what you would be using that has 3/8" NPT?

[Eternalightwith]

http://www.plumbingsupply.com/flexes.html#dishwasher

Something like that.


May I ask what you would be using that has 3/8" NPT?

[Langer]

In short

NPT (national pipe thread) is a form of BSPT (British Standard Tapered Pipe Thread).
NPT is a tapered and uses fewer threads per inch than a 'G1/4"' thread.

A G1/4" thread is BSPP (British Standard Parallel Pipe Thread).
A G1/4" thread is not tapered and cannot be used with NPT.

What you can get are (for example) G1/4" -> 1/4"NPT adaptors (and vice versa). This is what you'll need. They are called "BSPT to NPT adaptors" and they are availble in both male-male, female-female and male-female varieties


http://www.mcmaster.com/

[Eternalightwith]

I know all that, just trying to find the damned thing!


A G1/4" thread is BSPP (British Standard Parallel Pipe Thread).
A G1/4" thread is not tapered and cannot be used with NPT.

What you can get are (for example) G1/4" -> 1/4"NPT adapters (and vice versa). This is what you'll need. They are called "BSPT to NPT adapters" and they are available in both male-male, female-female and male-female varieties


Problem is, most are BSPT to NPT. BSPT is tapered. BSPP is parallel.


You just said G1/4" is BSPP. You are correct. So BSPT to NPT won't work. I need BSPP to NPT. I don't think it's happening without multiple adapters per port. :(

Edit: Think I found it!

Good ole Sidewinders, Good ole Bitspower
http://www.sidewindercomputers.com/bi14nptog14s.html :D

P.S. IanY, doing some googling led me to old post on XS where you and Marci were helping a guy get G3/8" for his Thermochills. ;)

[Snyxxx]

http://www.plumbingsupply.com/flexes.html#dishwasher

Something like that.

You are going to use that type of hose on your build?

It may be easier to use normal hose and put stainless steel looking braid on it like Zlojack did in this thread. At least you can make any length you want.

http://www.realredraider.com/vbulletin/showthread.php?t=1798

[Eternalightwith]

cheaper too. ;)

You are going to use that type of hose on your build?

It may be easier to use normal hose and put stainless steel looking braid on it like Zlojack did in this thread. At least you can make any length you want.

http://www.realredraider.com/vbulletin/showthread.php?t=1798

[cheapskate]

Don't blame plumbers. Someone let an engineer design the standards, and they were typically anal about.
Part of your problem is G1/4" is the US standard for gas lines. They don't make adapters from the gas standard to the water standard because you could make something 'splode.

[alejo]

I thought that G1/4 was the "German" standard of having an o-ring on a BSPP fitting. I thought that the American standards were stuff like NPSM, NPT?

[cheapskate]

...That would be problem #2.:D
Some of us (me) still can't get them straight. I've seen them labeled as 1/4"G NPT, 1/4npt, and 1/4G.

[zlojack]

I don't understand all this. I just make sure I go with what I know will fit.