3A Fitting Threads

[cgluyas]

Can anyone help me with the sizes and standards for threads on 3A fittings, particularly a 4" fitting. The thread is not IDF or Bevel, but has a similar form to Acme.

 

[SteveatCSI]

http://www.3-a.org/standards/standards.htm

You can download standard if you don't have them.
We consider the thread "ACME" when we talk in general. The manufacturers of fittings would the exact dimensions.
Often you can get and adapter made and not have to cut the thread yourself.
stevec@csidesigns.com