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threading

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polecat:
morning all i have a pcp air reciever i need to make a plug to seal the ends the id is 20.5mm it has a 1.25mm thread inside the tube what size do i turn the plug before threading
i dont know new to this
thanks polecat

polecat:
am i right in thinking the thread stub should be 21.75mm dia so if i cut a 1.25pitch thread it should fit the id of 20.50 of the tube which is already threaded
thanks polecat

polecat:
anybody if you know tell me please am i right
polecat

RobWilson:
Hi Polecat

What pressure will this be operating  @  ?    where was it manufactured ?


If it was 22mm x 1.25   , I would expect the bore to be 20.75,,,,,,,,,,,,,,,, 1.25 mm pitch is VERY close to 20TPI   and 22mm is very close to 7/8  ,,,,,,,,, and 7/8 20 is used in high pressure fittings .


Rob 

polecat:
rob it is a 19" falcon air rifle tube all pressure tested so no worries will check your suggestions
thanks polecat

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