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AN (Air Force/ Navy) spec hose and fittings refer to dash sizes. This is caculated by multiplying the nominal bore size by 16.

example : You want a AN fitting for 1/2" hose, Take 16 x .50 (1/2") = 8 So you would need a -8 AN

example: You want a AN fitting for 3/8" hose, Take 16 x .375 (3/8") = 6 So you would need a -6 AN

example : You want a AN fitting for 1/4" hose, Take 16 x .25 (1/4") = 4 So you would need -4 AN

Hope this helps you with AN sizing.