Vintage stand pipe threads
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  1. #1
    Official RnS Addict 29stude's Avatar
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    Vintage stand pipe threads

    Ok this is slightly off topic...but I know there is a wide variety of knowledgeable people on here.

    A number of years ago I was given a collection of old Fire hydrant standpipe parts. I've finally got round to doing something with them (a short standard/reading lamp is the plan).

    However I've discovered that not all the threaded parts fit together properly.

    There is a blank cap which screws onto stand pipe perfectly, but the 2 instantaneous couplings only screw on about 1 1/2 turns before locking up. All the threads are clean and undamaged and none appear to be tapered. I assume the 2 couplings, originally came frome a different stand pipe, with slightly different threads.

    Basically I'd like to fit all them all together, so that the couplings screw all way onto standpipe. I'm hoping that someone will be able to identify the threads on either standpipe or couplings, so I can then look out for a suitable tap or die as required.

    7G whitworth thread gauge seems to match up reasonably well. I have tried internet search, but possibly due to the era these were made, there are a variety of threads shown, none which seem to match.


    thanks, Gav




    1. standpipe with one of the couplings screwed on as far as it will go..(1 1/2 turns)

    Hydrant 1.jpe



    2.Blank cap which is attached to stand pipe and fits perfectly.

    hudrant 3.jpe


    3.coupling which I belive originally had a washer inside, so would have had to screw fully onto a standpipe to make a seal.

    hydrant 4.jpe


    4. pitch of standpipe.

    hydrant 6.jpe


    hydrant 5.jpe
    Last edited by 29stude; 25-07-2019 at 14:45.

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  3. #2
    Official RnS Addict 29stude's Avatar
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    Official RnS Addict heavychevy's Avatar
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    Is the tpi the same on the internal threads?

    Are the external threads tapered?

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    Official RnS Addict 29stude's Avatar
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    Quote Originally Posted by heavychevy View Post
    Is the tpi the same on the internal threads?

    Are the external threads tapered?

    Yes tpi looks same. And can’t see taper on any threads.

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    Rods 'n' Sods Junkie cymrodder's Avatar
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    Threads that size were probably cut on a lathe. So they may not be standard sizes.

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    Official RnS Addict 29stude's Avatar
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    Quote Originally Posted by cymrodder View Post
    Quote Originally Posted by NMNeil View Post
    Threads that size were probably cut on a lathe. So they may not be standard sizes.


    Thanks for suggestions chaps

    I’ve not resolved problem yet, there are a couple of local firms that deal with ex-engineering stock, so thinking of taking parts to them and find compatible tap/die.

  10. #8
    richard rawlplug Torment's Avatar
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    try the rail heritage centre near you..


    The Oddlot Drag Racing Team...havin fun is usual
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    Rods 'n' Sods Junkie
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    used to be involved in engineering and company were making hub nuts for Rubery Owen artic trailers pressed with 600 tonne press bored then threade4d with a cri dan threading machine li8ke a lathe but had a thread cutting tool which moved at a set rate inside the nut, not like a tap which touches all of the inside of the nut just one side of the inside of the nut, these nuts had a bore of about 4". if not done and set up correctly the thread could be too tight or loose on the hub, we used go or no go testing tools to check they were within tolerance at the machining stage and after heat treatment.

    a friend involved in a very old steam roller pointed out all nuts bolts and threaded holes were numbered as threads were not standardised when it was built so each pair of threads were matched to each other maybe you have this type of problem?

  12. #10
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    A long shot, but perhaps a trip to the local fire station. They may be able to see if the threads are still used on current equipment, and they may give you a contact at whoever supplies their hoses.

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