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Compression fitting thread confusion!
Getting rather confused about compression fittings and thread sizings.
Take a 15mm straight coupler, e.g. http://www.screwfix.com/app/sfd/cat/...88231&id=14921 The internal diameter if the fitting is obviously 15mm, to take naturally 15mm pipe. But what is the thread size on either end? Now take something like: http://www.screwfix.com/app/sfd/cat/...12341&ts=05907 This is described as Female Iron Coupler Compression Fittings 15mm×½" The 15mm must relate to the internal diameter and I guess the thread size is the same on one end as the stright coupler. But what does the 1/2" relate to? The internal diameter on the other end or the thread size? Help! Graham |
On Sun, 16 Jan 2005 20:09:41 +0000, Graham Jones
strung together this: Getting rather confused about compression fittings and thread sizings. Take a 15mm straight coupler, e.g. http://www.screwfix.com/app/sfd/cat/...88231&id=14921 The internal diameter if the fitting is obviously 15mm, to take naturally 15mm pipe. But what is the thread size on either end? 1/2" Now take something like: http://www.screwfix.com/app/sfd/cat/...12341&ts=05907 This is described as Female Iron Coupler Compression Fittings 15mm×½" The 15mm must relate to the internal diameter and I guess the thread size is the same on one end as the stright coupler. But what does the 1/2" relate to? The internal diameter on the other end or the thread size? Thread size. For some reason all the pipes have gone metric but anything threaded is still imperial. 15mm fittings = 1/2" threads. Go figure. -- SJW Please reply to group or use 'usenet' in email subject |
Graham Jones wrote:
Getting rather confused about compression fittings and thread sizings. Take a 15mm straight coupler, e.g. http://www.screwfix.com/app/sfd/cat/...88231&id=14921 The internal diameter if the fitting is obviously 15mm, to take naturally 15mm pipe. But what is the thread size on either end? Now take something like: http://www.screwfix.com/app/sfd/cat/...12341&ts=05907 This is described as Female Iron Coupler Compression Fittings 15mm×½" The 15mm must relate to the internal diameter and I guess the thread size is the same on one end as the stright coupler. But what does the 1/2" relate to? The internal diameter on the other end or the thread size? Help! Graham The reason for all this is that I am trying to determine whether this: http://www.screwfix.com/app/sfd/cat/...12341&ts=05907 is the same as this: http://www.screwfix.com/app/sfd/cat/...76620&ts=07117 but without the flexible hose. Do both items have the same diameters and threads? Thanks, Graham |
On Sun, 16 Jan 2005 20:26:38 +0000, Graham Jones wrote: The reason for all this is that I am trying to determine whether this: http://www.screwfix.com/app/sfd/cat/...12341&ts=05907 is the same as this: http://www.screwfix.com/app/sfd/cat/...76620&ts=07117 but without the flexible hose. Do both items have the same diameters and threads? Yes. DG |
Derek * wrote in message ... On Sun, 16 Jan 2005 20:26:38 +0000, Graham Jones wrote: The reason for all this is that I am trying to determine whether this: http://www.screwfix.com/app/sfd/cat/...12341&ts=05907 is the same as this: http://www.screwfix.com/app/sfd/cat/...76620&ts=07117 but without the flexible hose. Do both items have the same diameters and threads? Yes. DG Well very nearly Derek. The flexible connector will be designed to fit on a basin tap with the seal being made with a fibre washer (very likely to be supplied in the pack) onto the annular end surface of the tap thread. The 15mmx 1/2"female iron fitting will screw on a tapered male thread on a pipe or other fitting and will be sealed by the thread jamming augmented by PTFE tape or bosswhite &hemp. Hope this helps Bob |
Graham Jones wrote:
Getting rather confused about compression fittings and thread sizings. Take a 15mm straight coupler, e.g. http://www.screwfix.com/app/sfd/cat/...88231&id=14921 The internal diameter if the fitting is obviously 15mm, to take naturally 15mm pipe. But what is the thread size on either end? Now take something like: http://www.screwfix.com/app/sfd/cat/...12341&ts=05907 This is described as Female Iron Coupler Compression Fittings 15mm×½" The 15mm must relate to the internal diameter and I guess the thread size is the same on one end as the stright coupler. But what does the 1/2" relate to? The internal diameter on the other end or the thread size? Help! Graham Thanks for everyones replies, a lot clearer now. |
In an earlier contribution to this discussion,
Graham Jones wrote: The reason for all this is that I am trying to determine whether this: http://www.screwfix.com/app/sfd/cat/...12341&ts=05907 is the same as this: http://www.screwfix.com/app/sfd/cat/...76620&ts=07117 but without the flexible hose. Do both items have the same diameters and threads? Yes, they both have a 15mm compression fitting one end and a 1/2" BSP female thread at the other end. However, I'm not sure whether the sealing arrangements of the 1/2" BSP bits are the same as each other. There are two different ways of sealing threaded joints. One uses parallel threads and a washer - as in a tap fitting. The other uses a long parallel female thread, and a slightly tapered male thread. The second sort actually seals on the threads when the tapered bit is far enough in, using PTFE tape or Boss White and hemp wound round the threads. I suspect - but am not sure - that your first reference is designed to screw onto a tapered thread. The second one (the flexible tap connector) is definitely parallel, and seals against a face, using a fibre or neoprene washer. -- Cheers, Set Square ______ Please reply to newsgroup. Reply address is invalid. |
Thread size. For some reason all the pipes have gone metric but
anything threaded is still imperial. 15mm fittings = 1/2" threads. Wonder why that is? What if you get a french threaded coupler? Would that really confuse a UK plumber? :-) M. |
Quote:
15mm compression fittings all have 1/2" male threads on so these can be used without the nut and olive for certain jobs. The same is not true for 22mm, these do not have a 3/4" thread. What a missed oportunity? Very often parallel threads are made with parallel threads, just use a lot more ptfe than usual. Of course for gas the only parallel thread allowed is the Long Screw, but for water parallel threads are commonplace. |
The message
from Paul Barker contains these words: 15mm compression fittings all have 1/2" male threads on so these can be used without the nut and olive for certain jobs. The same is not true for 22mm, these do not have a 3/4" thread. What a missed oportunity? They did once. I thought they changed decades ago but at Xmas I had to replace an inline valve that had been bought only about 3 years previously and found that to be 3/4" bsp while the replacement had the finer thread. -- Roger |
On Tue, 18 Jan 2005 23:50:43 +0000, Lurch wrote:
On Mon, 17 Jan 2005 06:14:35 +0000, Markus Splenius strung together this: Thread size. For some reason all the pipes have gone metric but anything threaded is still imperial. 15mm fittings = 1/2" threads. Wonder why that is? What if you get a french threaded coupler? Would that really confuse a UK plumber? :-) Confused me first time around, had some turn up on some Armitage toilet cisterns, bloody annoying! It's not so much the thread that is frogified but the size. It's 3/8 BSP which is not a common size in UK plumbing. The 15mm-3/8"F couplers are becoming more widely available. -- Ed Sirett - Property maintainer and registered gas fitter. The FAQ for uk.diy is at www.diyfaq.org.uk Gas fitting FAQ http://www.makewrite.demon.co.uk/GasFitting.html Sealed CH FAQ http://www.makewrite.demon.co.uk/SealedCH.html |
On Wed, 19 Jan 2005 21:27:01 +0000, Ed Sirett
strung together this: It's not so much the thread that is frogified but the size. It's 3/8 BSP which is not a common size in UK plumbing. I sussed that eventually, unfortunately I'd already positioned the 15mm x 1/2" angled service valves accordingly before plastering the wall up! The proximity of the male thread to the edge of the rear of the pan cased a few difficulties too, I thought that was the problem to start with then realised that the thread wasn't 1/2" BSP. -- SJW Please reply to group or use 'usenet' in email subject |
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