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Where to get standard BSP threads in US?

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Where to get standard BSP threads in US?

Unread postAuthor: JDP12 » Tue Nov 29, 2011 10:28 pm

Tried mcmaster, they don't have just plain old BSP threads unless I'm an idiot, they have BSPT, BSPP but not BSP.
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Unread postAuthor: Gun Freak » Tue Nov 29, 2011 10:34 pm

BSPT= British Standard Pipe thread= BSP.
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Unread postAuthor: JDP12 » Tue Nov 29, 2011 10:36 pm

oh bollocks I'm an idiot.. I thought BSPT stood for BSP Tapered, not thread.

wow. Clearly, I'm staying up too late.
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Unread postAuthor: Gun Freak » Tue Nov 29, 2011 10:39 pm

Well they are tapered, just like NPT.
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Unread postAuthor: JDP12 » Tue Nov 29, 2011 10:44 pm

Are you sure?

A quick google search reveals this from wikipedia:

Two types of threads are distinguished:
Parallel ('straight') threads, British Standard Pipe Parallel thread (BSPP; originally also known as[1] British Standard Pipe Fitting thread/BSPF and British Standard Pipe Mechanical thread/BSPM), which have a constant diameter; denoted by the letter G.
Taper threads, British Standard Pipe Taper thread (BSPT), whose diameter increases or decreases along the length of the thread; denoted by the letter R.


So what is a normal BSP? as in, what would this valve be?
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Unread postAuthor: Gun Freak » Tue Nov 29, 2011 10:56 pm

I'm pretty sure threads for gas seals are most commonly tapered because of the way they seal. Someone else can chime in though because I've never even touched a BSP fitting.
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Unread postAuthor: jackssmirkingrevenge » Wed Nov 30, 2011 12:26 am

JDP12 wrote:bollocks


Cunning use of a quintessentially British expletive when talking about their threads :D

I thought BSPT stood for BSP Tapered, not thread.


It does!

The ones on the QEV are not tapered.

This is what you're looking for if you need an adapter: http://www.ebay.com/itm/HP-fitting-stai ... 2eafa13c16

... kinda removes the advantage of the cheap valve though if you need to buy expensive fittings to use it.
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Unread postAuthor: JDP12 » Wed Nov 30, 2011 1:00 am

Cunning use of a quintessentially British expletive when talking about their threads


I thought you might appreciate that :wink: I must admit you have gotten me using words like bollocks alot in real life, confusing many of the people I hang out with haha :)

all thanks to you, be proud.
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Unread postAuthor: spudamine » Wed Nov 30, 2011 3:16 pm

Just to further confuse things, a male BSP taper will seal well with a female parallel thread, but a male parallel thread will not work well with a female taper. Generally speaking taper threads are used more for plumbing, and parallel threads, which require an o-ring or washer for sealing, for pneumatics/hydraulics.
the annoying thing about parallel fittings is they will only seal at a certain orientation, I sometimes get around this by ignoring the sealing ring and whacking some epoxy in instead.
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Unread postAuthor: jackssmirkingrevenge » Wed Nov 30, 2011 4:19 pm

spudamine wrote:I sometimes get around this by ignoring the sealing ring and whacking some epoxy in instead.


A man after my own heart :)
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