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Thread: What kind of unholy thread is this!

  1. 07-31-2022, 7:47 PM #1
    brad hays's Avatar
    brad hays
    brad hays is offline [OP] Member
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    What kind of unholy thread is this!

    I'm setting up some pneumatic lines and I've come across a thread size I haven't seen before in quick disconnect fittings; and because I haven't gotten a grasp yet of how odd pipe sizes work I thought I should ask before I started ordering random parts, which is my usual MO.


    I need a fitting that fits the thread in the first picture and plugs into my regular quick connect air hoses. The part (for comparison) underlined in red is labeled a 1/4" male connector by the kit it came in, and although it looks like it'd fit the hole it doesn't. So, does that make the one that does something like a 1/8"? I'm not even sure if quick connect fittings come with that size thread. Everything that comes up when I search for 1/8" is a push to connect fitting.


    I know I could just put a hose over the barb, clamp and call it a day. But that still requires getting more parts, and if possible I'd rather have it fit into what I've already got.

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  3. 07-31-2022, 7:58 PM #2
    Bill Dufour
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    NPT 1/16 and 1/8 are both 27 TPI
    1/4 and 3/8 are both 18 TPI.
    What is the part, where and when was it made? Are you sure it is not British or metric. I think BSP is 55 degree.
    Many water meters use 5/8 pipe because no one sells fittings making it impossible to tap into the line with out an easy to spot hack job.
    Bill D.

    https://www.engineersedge.com/hardwa...pe-threads.htm
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  4. 07-31-2022, 8:19 PM #3
    Maurice Mcmurry's Avatar
    Maurice Mcmurry
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    Bills info + A thread gauge will help.

    Screen Shot 2022-07-31 at 7.15.30 PM.jpg
    Last edited by Maurice Mcmurry; 07-31-2022 at 8:23 PM.
    Best Regards, Maurice
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  5. 08-01-2022, 11:22 PM #4
    Bill Dufour
    Bill Dufour is offline Contributor
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    Watch out for those ebay thread guages. I got one set that was all whitworth and metric. Had to buy another one to get USA thread forms. Whitworth was good to have to verify my Taiwan Mill/drill was NC bolts not whitworth or metric like I was expecting.
    Bill D
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  6. 08-01-2022, 11:24 PM #5
    Bill Dufour
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    There are DIN pipe threads but no one uses them . German cars use NPT or British pipe threads for oil senders etc.
    Bill D

    Link to basic thread ID

    https://trimantec.com/blogs/t/thread...fication-guide
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  7. 08-01-2022, 11:27 PM #6
    Bill Dufour
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    I winder if that is a 1/4" tubing connection on the straight threaded side.
    Bill D
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