"AN" Thread Sizes

"AN" (Army-Navy) Sizes were established by the Aerospace industry years ago and were designated O.D. of the rigid metal tube that each size fitting is used with. (The chart below will clarify this point.)

The numbers assigned equate to the O.D. (outside diameters) of the tubing in 1/16". Since tubing and hoses are to be found with assorted wall thicknesses we can now understand that the designated size number does not necessarily tell you how large the inside diameter will be. (For example, the inside diameter of an Earl's size 6 hose end is nearly as large as the inside diameter of some other manufacturers' -8 hose ends.)

Each AN size number has its own standard thread size which can be seen in column three of the chart. Again, these are the same thread sizes that have been used in aircraft and industrial applications for many years.

AN SIZE METAL TOBE O.D. THREAD SIZE
2 1/8" 5/8-24 SAE
3 3/16" 3/8-24 SAE
4 1/4" 7/16-20 SAE
5 5/16" 1/2-20 SAE
6 3/8" 9/16-18 SAE
8 1/2" 3/4-16 SAE
10 5/8" 5/8-14 SAE
12 3/4" 1-1/16-12 SAE
16 1" 1-5/16-12 SAE
20 1-1/4" 1-5/8-12 SAE
24 1-1/2" 1-7/8-12 SAE
28 1-3/4" 2-1/4-12 SAE
32 2" 2-1/2-12 SAE


Pressure Test All Hose
 Assemblies Before Installation!

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