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Please Identify This Thread, No Not This Thread, That Thread...

Discussion in 'Anything Airgun Related' started by Nubble, Jun 14, 2019.

  1. Nubble

    Nubble Donator

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    Recently purchased the Huma gauge to fit my PP800 and finally got round to stripping the gun last night. :)
    I was rather disappointed to find that the threads are different. :( I did think it looked different when the HUMA gauge arrived but thought that was just me so thought nothing more of it but upon fitting (or not fitting as the case may be) I discovered that the threads are in fact different.

    The thread on the Huma gauge is 1/8"BSP so what does that make the Artemis gauge?? :confused:

    Huma on the left, Artemis on the right.

    [​IMG]


    :thumb:
     
  2. Nobby

    Nobby Posting Addict

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    There's a NPT thread that is very similar, but 27tpi I recall. Easy to get mixed up.
     
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  3. Flying wombat

    Flying wombat Once more balance is restored

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    Unf?:shrug:
     
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  4. Kev The Fish

    Kev The Fish Buxted Rifle Club Member

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    I would also hedge my bets on NPT as my compressor and stirrup pumps also from China seemed to be this
    Kev

    .
     
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  5. That hurts

    That hurts Barely Active

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    = Unified National Fine
     
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  6. PumpnGun

    PumpnGun Donator

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    UNF = Unexpectedly Nubble Flees....AGF :D

    Ray
     
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  7. cloverleaf

    cloverleaf Super Moderator Staff Member Mod/Admin

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    If the one on the LHS is the Huma and 1/8BSP, the one on the right looks like a metric thread - M8x1.25 perhaps?
     
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  8. bob4026

    bob4026 Posting Addict

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    Looks like M8 1.25 to me pal. Any engineering shop should have some thread gauges and they'd be happy to help i'm sure.

    Bob
     
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  9. td_boy

    td_boy Donator

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    Going by the scale I'd have to say nearer M10x1.5...just try an M10 nut on it.
     
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  10. Nubble

    Nubble Donator

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    To be honest I have not measured it. I shall do this evening and in the meantime I shall try an M8 and M10 nut and see.

    Thanks fellas.
    :thumb:
     
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  11. Nubble

    Nubble Donator

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    PS. Maybe I should have said that the HUMA gauge actually has a thicker threaded diameter/section but thought it would be obvious from the photo.

    :thumb:
     
  12. td_boy

    td_boy Donator

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    Ignore my M10 guess... I mis-read the size of the other as 1/4" BSP:facepalm: - so I think Cloverleaf and Bob are right:thumb:
     
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  13. Nobby

    Nobby Posting Addict

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    1/8 BSP is 28 tpi and 0.383" overall nominal diameter, approx 9.7mm. The one on the right looks smaller.
     
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  14. Nubble

    Nubble Donator

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    Thanks Nobby, it is indeed smaller. Just tried M8 and M10. M8 is the right dia but only goes on about a turn so not 'metric'

    :thumb:
     
  15. td_boy

    td_boy Donator

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    Counting the number of 'TPI' (teeth per onch) would help...
     
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  16. Nobby

    Nobby Posting Addict

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    8mm is very close to 5/16 inch. The Imperial options are 5/16 BSW at 18 tpi and 5/16 BSF at 22 tpi. The US options are 5/16 UNC also at 18 tpi and 5/16 UNF at 24 tpi.

    M8 is normally 1.25mm pitch which is close to 20 tpi. M8 fine is 1mm pitch.

    TD is right, we need some measurements.
     
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  17. snipperuk

    snipperuk Donator

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    From memory my P10 gauge was m8 x 1
     
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  18. snipperuk

    snipperuk Donator

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  19. cloverleaf

    cloverleaf Super Moderator Staff Member Mod/Admin

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    The Chinese seem to like metric threads so I suspect it's something other than M8 coarse (1.25mm pitch). Next obvious choice would be M8 fine (1.0mm pitch). Get a vernier or steel rule on the threads and count how many threads there are in 5mm - my guess would be 5 ;)
     
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  20. Nubble

    Nubble Donator

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    Once again thank you for the replies gentlemen. Seems like you have correctly identified the thread in question which I suspect is in fact M8 fine.

    I have done my best to take a photo (with generic iDevice camera phone) which I hasten to add is a little tricky as you need 3 hands!!!



    [​IMG]

    [​IMG]



    Now, does anyone know where I can get a silver pressure gauge with a metric M8 fine thread?? :D
    :thumb:
     
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