Keg connectos: what are "MFL"/Barb/SAE threading fitting sizes?

Frankly only shops I have visited fail completely in providing an indication about what exactly they are selling when it comes to keg fittings.

I have read this answer to another question, which was asking less generally then this, also about the fittings for keg connectors.

My question is: What are the different standards related to those fittings, what, and more over how can I measure which fitting I have?

Bonus: Is it only my impression that online shops do extremely poorly with regards to providing any, or if so accurate description about the fittings.

Example: I have two fittings I can tell that the outer diameter of the red fitting is about 12.60mm / 0.496inches and of the black one it is about 10.86 mm / 0.427 inches.

Part of an answer could also be which of those fittings sizes/descriptions like MFL, actually exists, or are merely customarily used, but are not actually a "thing".

Topic keg homebrew

Category Mac

1
answered at

Definitions:

SAE J512/4 - 12.7mm is 1/2-20 and 9.5mm is 3/8-24 or 11.1mm is 7/16-20. (10.86mm is not one of the available sizes).

Source:

Note: For sizes 3/16 to 3/8 and 1/2 to 3/4 the flare type fittings depicted in Figures 1A to 3C are identical with the corresponding refrigeration tube fittings specified in SAE J513. Special size combination fittings 3/16 to 3/8 and 1/2 to 3/4 shall be as specified in SAE J513.

See also:

37°45°

It appears that those are 37° MFLs (J514).

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