http://www.anplumbing.com/page/1
common examples:
AN-3.....3/16" tube size or .1875" .1875" X 25.4=4.7625 MM
AN-4......4/16"(1/4") tube size .250" X 25.4= 6.35 MM
AN-6.......6/16"(3/8")tube size .375"...........9.525 MM
AN-8.......8/16" (1/2") .500"............12.7 MM
AN-10.....10/16"(5/8") .625".........15.875MM
Never knew that the AN number represents the multiple of 16th of an inch.
Nice vid on putting together your own fittings:
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