School me on AN fitting sizes, etc.

[thatK30guy]

I read #3 and #4 AN fittings for brake lines, etc. and wondered "WTF" on the thread sizes of those two.

Does anyone know of a website with info on decoding these numbers? I've already learned NPT and SAE along with some metric sizes but what the heck are the numbers to the AN fittings?

 

[boz42]

See if that helps. http://en.wikipedia.org/wiki/AN_thread . "AN" is its own standard thread size.

 

[DEMON44]

its based on 16ths........


-4...dash four....#4...4/16......1/4

-8...8/16........1/2"

-10...10/16....5/8ths

-20...1 1/4"

-32....2"

sorry to answer the question........#3 is 3/16"......#4 is 1/4"

 

[4X4HIGH]

Ok, lets start with the basics.
"AN" stands for (Army-Navy) AN 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 numbers assigned equate to the O.D. 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 I.D. will be.

Here is a "AN" size versus the thread size used for each fitting size.

AN size Metal tube O.D. Thread size

-2 = 1/8" = 5/16-24 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" = 7/8-14 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