General Reference

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AN / NPT

"AN" (Army Navy) Sizes were established by the aerospace industry. The measurements represent the O.D. (outside diameter) of rigid metal tubes. Basically, dash sizes are the numerators of fractions with a denominator of 16.

EXAMPLE:
-6 is equal to 6/16 in. which is equal to 3/8 in.
-8 is equal to 8/16 in. which is equal to 1/2 in.

In the examples above, a -6 AN fitting would work with a pipe that has a 3/8 in. O.D. A -8 AN fitting would be used with 1/2 in. O.D. pipe.

Here's a simple chart, just in case you don't want to do the math.
-02 AN is equal to 1/8 in.
-03 AN is equal to 3/16 in.
-04 AN is equal to 1/4 in.
-05 AN is equal to 5/16 in.
-06 AN is equal to 3/8 in.
-08 AN is equal to 1/2 in.
-10 AN is equal to 5/8 in.
-12 AN is equal to 3/4 in.
-14 AN is equal to 7/8 in.
-16 AN is equal to 1 in.
-20 AN is equal to 1 1/4 in.
-24 AN is equal to 1 1/2 in.
-32 AN is equal to 2 in.

The most commonly used fittings are adapters. These adapters connect an AN fitting to a pipe thread fitting. Most fuel pumps, regulators, and canister type fuel filters, come with pipe thread inlet/outlet ports. In order to use braided line, the ports need to be changed to a AN type of fitting. This is when a "pipe to AN adapter" is needed. The most popular sizes used in fuel systems are the -6 and the -8 AN, although some high performance fuel pumps and regulators require a -10 AN fitting.

AN (Army-Navy) Fitting Thread Size Chart
AN Size=Hose Size==Thread Size
-3......... 3/16......... 3/8-24 SAE
-4......... 1/4........... 7/16-20 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 SAE
-16......... 1............. 1-5/16 SAE
-20....... 1-1/4......... 1-5/8 SAE


NPT (national pipe thread) Fitting Thread Size Chart
Pipe Thread=Threads per Inch=Inside Dia.
1/16........... 5/16-27............. 1/16
1/8............. 27.................... 1/8
1/4............. 18.................... 1/4
3/8............. 18.................... 3/8
1/2............. 14.................... 1/2
3/4............. 14.................... 3/4
1................ 11-1/2............... 1

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