Am I being dumb ?

I bought some :

BLACK MALLEABLE IRON REDUCING PIPE FITTINGS BSP - SOCKET, BUSH, TEE, HEX NIPPLE
( 111520014759 )

Fitting Type: REDUCING BUSH

Size: 1/2" x 3/8"

When they arrived I was surprised my 3/8" male threaded pipe didn't fit ?
So I emailed the vendor and said although you have 1/2" to 3/8" stamped on the Bush its actually measures 14.1 which I think is 9/16 0.5625 or 14.2875mm well near enough.
Anyway I emailed the guy and this was his reply

hi David, there is no such size as 9/16" , the fitting is correct just check . (there is sizes cast on fitting one side of hex part)
1/2" X 1/4" bushes have a inside 11mm if any better for you.

Here's me thinking 1/4" was 6.35mm ?

I'm confused

Pic attached

Attachment 19768

As Robin has stated an interest in "having fun" I withdraw my earlier request...your all now free to continue with lessons and raucous finger pointing !! :P

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Originally Posted by Robin Hewitt

Hold on indeed, you ask if you are being dumb and then say, "No need to answer" ???

Where's the fun in that? :)

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Hi there,
they have sent you a 3/8 fitting, the fractional inch number refers to the inner diameter of tube that would have once screwed in the fitting(back when pipe was made slightly thicker)

confusing isnt it!

Ah bsp claims another victim! :-/ :-(

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Originally Posted by jamesgates1000

Hi there,
they have sent you a 3/8 fitting, the fractional inch number refers to the inner diameter of tube that would have once screwed in the fitting(back when pipe was made slightly thicker)

confusing isnt it!

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Just figured that out before u posted lol thanks anyway :)

Now I need to reduce again from BSP 3/8 to a normal everyday 3/8 thread ..any suggestions well more like what the hell do I buy ??

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Originally Posted by Fivetide

*** ok no need to answer ... I now realise that BSP has nothing to do with normal sizes ..WHY CANT THINGS BE SIMPLE !!!

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Hold on indeed, you ask if you are being dumb and then say, "No need to answer" ???

Where's the fun in that? :)

Could you clarify what you are trying to fit to what? Somehow from what you've said you I don't think that you will find an off-the-shelf fitting but if we know what's needed it will be easier to advise. For example, is your "normal everyday 3/8" thread" UNC, UNF, BSF, BSW? Not to mention the finer threads in the ME series... Or maybe nearest metric size? It's all a bit of a rat's nest :smile:

BTW, I don't know of any thread where measuring the inside of the thread (as per your picture) will give you a recognisable dimension. Usually threads are measured over the outside - in effect, the diameter of the rod that an external thread was cut on. You can use internal diameter to find actual thread size but you will need to know what you are looking for in thread tables (possibly core size, give or take a bit of clearance).

https://mdmetric.com/tech/thddat7.htm

Major and minor diameters plus all the other dimensions you could need ;-)

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Originally Posted by Neale

Could you clarify what you are trying to fit to what? Somehow from what you've said you I don't think that you will find an off-the-shelf fitting but if we know what's needed it will be easier to advise. For example, is your "normal everyday 3/8" thread" UNC, UNF, BSF, BSW? Not to mention the finer threads in the ME series... Or maybe nearest metric size? It's all a bit of a rat's nest :smile:

BTW, I don't know of any thread where measuring the inside of the thread (as per your picture) will give you a recognisable dimension. Usually threads are measured over the outside - in effect, the diameter of the rod that an external thread was cut on. You can use internal diameter to find actual thread size but you will need to know what you are looking for in thread tables (possibly core size, give or take a bit of clearance).

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Ok Neale thanks for the reply, I'm trying to get to a point where I can screw in a 3/8" bolt to the bush after I've ground the head off and fit it into a chuck capable of taking up to 13mm. if that makes sense ?

Have a look at https://www.bes.co.uk/products/160.asp. You might find something like an end plug you can drill and tap to your 3/8 bolt. Maybe you could just weld or braze the bolt on.

Oh the joy of BSPP BSPT and NPT. You can learn more at http://www.newmantools.com/taps/bsp.htm

Cheers,

Rob

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Originally Posted by cropwell

Have a look at https://www.bes.co.uk/products/160.asp. You might find something like an end plug you can drill and tap to your 3/8 bolt. Maybe you could just weld or braze the bolt on.

Oh the joy of BSPP BSPT and NPT. You can learn more at http://www.newmantools.com/taps/bsp.htm

Cheers,

Rob

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Hi Rob yep thought about these methods but if it out of center it would cause problems, I might take them into the local iron mongers find the right bolt and then find some kind person with a lathe to turn one end down to 10mm.. path of least resistance etc. :courage:

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Originally Posted by Fivetide

Ok Neale thanks for the reply, I'm trying to get to a point where I can screw in a 3/8" bolt to the bush after I've ground the head off and fit it into a chuck capable of taking up to 13mm. if that makes sense ?

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Sorry but I have to ask again - what 3/8" thread? If it's an old bolt, then it might be (imperial) BSF or BSW, newer might be (unified) UNF or UNC. Might, just, if it's a bit sloppy on its OD, be M10, depending on how accurately you have measured it. You might end up having to buy a matching tap and making it yourself, unfortunately, unless you have a kind forum member nearby with a lathe and good set of taps!

Edit - I see that you've more or less reached that conclusion!

Quote:

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Originally Posted by Neale

Sorry but I have to ask again - what 3/8" thread? If it's an old bolt, then it might be (imperial) BSF or BSW, newer might be (unified) UNF or UNC. Might, just, if it's a bit sloppy on its OD, be M10, depending on how accurately you have measured it. You might end up having to buy a matching tap and making it yourself, unfortunately, unless you have a kind forum member nearby with a lathe and good set of taps!

Edit - I see that you've more or less reached that conclusion!

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Screw Size: 3/8" UNF x 1.1/2" long Thats what I found will fit in the chuck , thats why I thought it would fit in the bush.. that sounds naughty lol :)

I may have come up with a cunning plan :)
I found these Push Fit Stem Adaptors they may be strong enough for what I need , but if not I can cut off the stem and tap out the nut.. may work but hey I love a challenge :)

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Originally Posted by Fivetide

I may have come up with a cunning plan :)
I found these Push Fit Stem Adaptors they may be strong enough for what I need , but if not I can cut off the stem and tap out the nut.. may work but hey I love a challenge :)

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You maaaaay be asking a lot from Acetal, but you could always put a steel rod down the centre and bond it in.

Cheers,

Rob

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Originally Posted by cropwell

You maaaaay be asking a lot from Acetal, but you could always put a steel rod down the centre and bond it in.

Cheers,

Rob

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Shit ! I thought they where steel FFS ..cancel that order then :(

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Originally Posted by Fivetide

Shit ! I thought they where steel FFS ..cancel that order then :(

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Sorry mate - they may be metal, but most of the ones I have seen are acetal. I would give Bob or Chris at Context a ring and check it out. You could always use a brass hosetail ??? - Rob

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Originally Posted by cropwell

Sorry mate - they may be metal, but most of the ones I have seen are acetal. I would give Bob or Chris at Context a ring and check it out. You could always use a brass hosetail ??? - Rob

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It does say Plastic, I have canceled them . They are a bit steep if plastic as you can get a the same size stainless steel for £3 and they come in at £2.50 ?