AN Thread Size and AN Fitting Size Chart

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

Web App version of this chart. Bookmark the link below in your mobile device:

http://www.mechanicsupport.com/apps/Threads/index.html

Dash and Thread Size Chart
Click on the Right button for next chart. Handy reference for sizing fittings and fasteners.