Measuring Inside Diameter
|Measuring outside "major" diameter|
|AN Dash Size Chart|
AN fittings differ from commercial threads in that they are class 3 instead of class 2 and generally UNJF rather than commercial UNF. Threadform: UNJ -3A or 3B
Note: There is an entire industry supplying so-called "AN" fittings that do not meet aerospace standards. See my article at http://www.mechanicsupport.com/articleStronger.htmanicsupport.com/articleStronger.htm
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Dash and Thread Size Chart
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