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>     Anybody know the difference between CGA 540 fittings (oxygen) and CGA
>     500 fittings (medical gas)?  They seem to be the same size.
>     Andy Cohen

I'm not sure we are talking to same thing - the CGA 500 and 540 I'm
thinking of are entirely different.
The CGA500 nut is male rather than female like the 540, and also .028
smaller. The nipples are different, too - nipples for M nuts have short
nipple cones with integral flats, where the nipples for F nuts have longer
nipples and a hex nut.
Looks don't mean much with CGA fittings - in the above instance, the
difference between M and F threads make it pretty easy to spot, but notice
the tiny difference in thread diameter too.


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