air arms tube thread

Discussion in 'General Airgun Chat' started by hotversion, Aug 21, 2014.

  1. hotversion

    hotversion Member

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    Can anyone tell me the thread size on the air cylinders on air arms please?
     
  2. spartan

    spartan New Member

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    If my memory serves me right, 28.5mm od by 1.25 pitch
     
  3. Neale M

    Neale M Member

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    What memory Shaun ;-)
    Have you done my mods for 007 ;-)
     
  4. hotversion

    hotversion Member

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    Re

    Thank you,in laymans term is it unf metric fine bsp 1 inch ect?
     
  5. spartan

    spartan New Member

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    Its a metric pitch, 28.5mm is the outside diameter of the thread, 1.25 is the pitch of the thread.

    Neil drop your rifle of when your not using it for a week or two.
     
  6. Tench

    Tench WHFTA World Champion 2016.

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    Unless the AA in question is an S200 then the thread is 25x1mm.
     
  7. rich

    rich Active Member

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    The S200 is smaller than that. The O ring is a 21mm x 2mm or 2.5mm depending on age.
     
  8. Tench

    Tench WHFTA World Champion 2016.

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    The several hundred regs I machined at 25x1mm must all have been wrong then.

    A 21 x 2.5mm o ring will have an O/d of 26mm, id + 2x thickness.
     
  9. rich

    rich Active Member

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    The S200 manual and parts list from AA says 21mm.
     
  10. Tench

    Tench WHFTA World Champion 2016.

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    Then the AA manual is probably quoting an O ring dimension and not referring to the thread size which is 25x1mm, which is also the same thread BSA use on their air tubes.
     

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