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Crazy American threads

Discussion in 'Gear and Equipment' started by good4whatAlesU, 11/9/17.

 

  1. good4whatAlesU

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    Posted 11/9/17
    so..am trying to get this amicon keg up and running but I'm having some difficulties with the threads.

    The post has some kind of weird 3/8 tapered thread (doesn't fit anything I can find), with a 7/16 unf male adapter.

    The ball lock posts I've ordered are 1/4 inch. I figure I need some kind of 7/16 to 1/4 unf adapter?

    Am I screwed (excuse the pun).
    Is this "thread" going nowhere?
    wp_ss_20170911_0001.png
     
  2. mtb

    Beer Bod

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    Posted 11/9/17
    Here I was hoping this thread would discuss the yank equivalent of the crap we often see discussed here on AHB. You mislead me g4wAU.
     
  3. Moog

    BIAB-ER

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    Posted 11/9/17
    americans will be NPT threads, which are fairly close to BSPT , normally only about 1 TPI difference.
    You can sometimes get away mixing the 2 with lots of PTFE tape, but ideally you'd use the right stuff.
     
  4. good4whatAlesU

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    Posted 11/9/17
    cheers guys. It's making my brain hurt.

    john guest reckons 7/16 unf is equivalent to ffl 1/4. Not that that helps necessarily...

    I plugged it into the bunnings thread finder and one end is definitely 7/16 unf.
     
    Last edited: 11/9/17
  5. good4whatAlesU

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    Posted 11/9/17
    Thanks Moog you were onto it. The port tapped into the keg is a 1/8 NPT. The adapter looks to be a 1/8 NPT to 7/16 unf (male - male) fitting.

    Will go searching for options to convert either of these to suit the 1/4 BSPP ball lock post. ... ye gods.

    Crazy Americans !!!
     
  6. good4whatAlesU

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    Posted 11/9/17
    Bingo. Thanks Moog.

    thread converter.png
     
  7. Lyrebird_Cycles

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    Posted 12/9/17
    The real craziness is why we are still using BSP in Australia 43 years after we officially went metric.

    There's no hope for the Septics and their "Freedom Units"
     
  8. mtb

    Beer Bod

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    Posted 12/9/17
    That page is great, I learned some new words today.
    STEAMROLLERED
    METRICATOR
     
  9. Pnutapper

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    Posted 12/9/17

    I would be careful of using brass in your keg. It will very likely give you a nasty flavour taint.
     
  10. good4whatAlesU

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    Posted 12/9/17
    Thanks for the tip, ill investigate a SS option.

    nothing ordered as yet. I still might get my big bro around (he's a fitter) to drill the effer out and tap in a metric.
     
  11. Moog

    BIAB-ER

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    Posted 12/9/17
    pipe threads are tapered, so they seal very high pressure, the old BSPT and NPT are still the only options I know of, and they've been used forever.
     
    koshari likes this.
  12. n87

    Same as it ever was

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    Posted 12/9/17
    Well F me. whoever wrote that has very little idea. while most of it (that I have read) is true, it has been twisted

    And what the **** about US and Imperial units being totally fucking different.
     
  13. Lyrebird_Cycles

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    Posted 12/9/17
    Turns out you are right, the ISO adopted the British system and renamed it, so an ISO 7/1 R 1/4 is just 1/4 BSPT under another name.
     
  14. mtb

    Beer Bod

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    Posted 12/9/17
    Don't try to understand the logic n87. Some people are completely deluded / so up their own ass that they can't see reason and rationale. Take a certain President or Hanson and their respective supporters, for example.
     
  15. akx

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    Posted 12/9/17
    As an American metricator I'd like to offer a 'measured' response. Idiots in all countries have figured out how to make web pages.
    Not all Americans feel that way. Viva la Metric-cion.

    Back on topic: it took me 2 years to find the right flared fitting for a project once. I still get mixed up on the different standards.
     
    good4whatAlesU and Mat B like this.
  16. koshari

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    Posted 12/9/17
    the whole nominal bore concept totally thew me the first time i encountered it coming from an electrical/metric thread background, it seemed strange that the thread dimensions had zero bearing on the quoted size.
     
  17. good4whatAlesU

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    Posted 12/9/17
    Slight issue, I can't easily locate any SS versions of the 1/8 (NPT) to 1/4 (BSP) adapters. But I can easily get brass, for reasonable price.

    What are thoughts on coating the inside of the brass with Loxeal or something (picked up idea from the galling thread). The Loxeal is food safe and dries hard (and I can keep using it for other stuff - so not money wasted). The brass adapter is only around 2 cm length (okay, 1 inch Lol).

    Edit: I like Lyrebirds silver coating example, but just too dear I think for a $5 part ...
     
    Last edited: 13/9/17
  18. Lionman

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    Posted 13/9/17
  19. good4whatAlesU

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    Posted 13/9/17
    Yes you would think. But 1/8 npt is not 1/8 inch. It's around 3/8 inch.

    Crazy Americans!!
     
  20. good4whatAlesU

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    Posted 13/9/17
    wp_ss_20170913_0008.png .
     
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