Discussion in 'General Airgun Chat' started by hotversion, Aug 21, 2014.
Can anyone tell me the thread size on the air cylinders on air arms please?
If my memory serves me right, 28.5mm od by 1.25 pitch
What memory Shaun ;-)
Have you done my mods for 007 ;-)
Thank you,in laymans term is it unf metric fine bsp 1 inch ect?
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.
Unless the AA in question is an S200 then the thread is 25x1mm.
The S200 is smaller than that. The O ring is a 21mm x 2mm or 2.5mm depending on age.
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.
The S200 manual and parts list from AA says 21mm.
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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