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  1. #1
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    Default Cannot work this out for the life of me, diy pressure gauge, fittings!

    Before u guys say its all on google i have tried many times to work this out

    I have built a bottle jack into a hydraulic pressure gauge but my gauge only goes to below 200 psi i need a gauge that will go to atlease 3000 psi i have already drilled and tapped my bottle jack to 1/4 bsp now this gauge im looking at says its thread is bspt or bspp i donno which is which i tried many googles if 'bsp will fit bspp' but it keeps comparing britsh with american fittings i have looked at multiple charts and have come to bspt is taped thread mine is bsp straight thread

    Is bsp the same as bspp?
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  2. #2
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    Default

    Hi Gazza.

    BSPT is a tapered thread. BSPP is a parallel thread. As far as I'm aware the pitch is the same for either of the same size.

    If it doesn't have a "T" then its usually parallel. Note that the literature says that above a certain pressure, 40000Kpa, the threads should be parallel.
    Best Regards:
    Baron J.

  3. #3
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    Default

    Thanks Baron so will the bspp fit in my bsp threaded hole?

  4. #4
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    Default

    It might depending on what your tap was.
    If it was just stated as BSP it may be parallel or tapered.
    Was there anything in the description of the tap to confirm the type of tap?

  5. #5
    BobL is offline Member: Blue and white apron brigade
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    Default

    It's pretty easy to visibly see the difference between most BSP and BSPT taps. The BSP will have most of the tap more or less parallel whereas the BSPT will show visible increase in diameter all the way along its length.

    BSPandBSPT.JPG

    You can usually determine more accurately which is which using digital callipers.

    Provided a full length hole has been drilled and tapped A BSPT male should fits a BSPT female most of the way along the contact thread.
    Same applies to BSP male and BSP female threads.
    BSPT males into BSPP female ,OR BSPP male into BSPT female threads produce minimal thread contact (only one turn will have full contact and the rest will only have partial to zero contact) so should not be used in high pressure situations. The minimal contact means they are also prone to leaks.

    Helped along with a few extra turns of sealing tape I have a couple of BSPT/BSP connections in my compressed air line but I'd say your application is high pressure so be careful.

  6. #6
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    Default

    Thanks guys i have a BSP tap its the same diameter along the taps thread, are BSP and BSPP the same thread? This is unclear to me and what i am having diffuclty understanding

  7. #7
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    Default

    It is the same thread but one may be parallel or tapered.

  8. #8
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    This is what I understand it all to mean. There is BSP thread which can be tapered or parallel. BSPT is tapered BSP and BSPP is parallel BSP.
    Nev.

  9. #9
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    Bought some oxy gear many years ago just got it out of the shed and one of the 50,000kpa gauges had a bsp 1/4 fitting i put it on the jack and it worked

    I used this formular

    5000kpa / 725 psi or 450kg in weight, square diameter of jack piston is 1.38" psi = pounds

    Only weighed one back corner of the boat and trailer came in at 450kg going to put the boat trailer up on 2 stands and the pressure gauge jack and take 3 weights hopefully it pans out

  10. #10
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    Default

    Dont we also call bsp parrallel bspf...or is that something else again

  11. #11
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    Quote Originally Posted by eskimo View Post
    Dont we also call bsp parrallel bspf...or is that something else again
    Yes. BSPP is British Standard Pipe Parallel thread. BSPF is British Standard Pipe Fitting thread. There is also BSPM which is British Standard Pipe Mechanical thread. All the same thing.
    Nev.

  12. #12
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    Default

    Thank You Nev

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