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Subcategories:
AN Adapter Fittings

AN Adapter Fittings
AN Brake Fittings

AN Brake Fittings
AN Gauge Fittings

AN Gauge Fittings
AN Hose Ends

AN Hose Ends
AN Hose Lines

AN Hose Lines
AN Power Steering Fittings

AN Power Steering Fittings
AN Push Loc Barb Fittings

AN Push Loc Barb Fittings
AN Shut Off Valves

AN Shut Off Valves
AN Stainless Brake Or Clutch Lines

AN Stainless Brake Or Clutch Lines
AN Tee Fittings

AN Tee Fittings
AN Tools

AN Tools
AN Weld On Bungs

AN Weld On Bungs
Banjo Fittings And Bolts

Banjo Fittings And Bolts
Bulk Head Fittings

Bulk Head Fittings
Couplers

Couplers
Filters

Filters
Hose Finishers

Hose Finishers
Plugs And Caps

Plugs And Caps
Reducers

Reducers
Tube Nuts And Sleeves

Tube Nuts And Sleeves
Unions

Unions
The AN thread is a particular type of fitting used to connect flexible hoses and rigid metal tubing that carry fluid. It is a United States military-derived specification stemming from a joint standard agreed upon by the Air Force and Navy, hence the name AN.

AN sizes range from -2 (dash two) to -32 in irregular steps, with each step equating to the OD (outside diameter) of the tubing in 1/16" increments. Therefore, a -8 AN size would be equal to 1/2" OD tube (8 x 1/16 = 1/2). However, this system does not specify the ID (inside diameter) of the tubing because the tube wall can vary in thickness. With a hose you measure the ID not the outside diameter. Each AN size also uses its own standard thread size.

AN fittings are a flare fitting, using 37 degree flared tubing to form a metal-metal seal. They are similar to other 37 degree flared fittings, such as JIC fittings, which is their industrial variant. The two are interchangeable in theory, though this is typically not recommended due to the exacting specifications and demands of the aerospace industry. The differences between them relate to thread class (how tight a fit the threads are) and the metals used.

Note that 37 degree AN and 45 degree SAE fittings and tooling are not interchangeable due to the different flaring angles. Mixing them can cause leakage at the flare.

A typcial reference point for AN:
-10 is usually used for breathers and uses 5/8" ID hose.
-8 is usually used for oil and uses 1/2" ID hose.
-6 is usually used for fuel and uses 3/8" ID hose.
-4 is usually used for vacume lines and uses 1/4" ID hose.
-3 is usually used for brake lines and uses 3/16" ID hose.

AN Size Tube OD / Hose ID SAE Thread Size Pipe Thread Size (NPS)
- 2 1/8" 5/16-24  
- 3 3/16" 3/8-24 1/8-27
- 4 1/4" 7/16-20 1/4-18
- 5 5/16" 1/2-20  
- 6 3/8" 9/16-18 3/8-18
- 8 1/2" 3/4-16 1/2-14
- 10 5/8" 7/8-14  
- 12 3/4" 1-1/16-12 3/4-14
- 16 1" 1-5/16-12  
- 20 1-1/4" 1-5/8-12  
- 24 1-1/2" 1-7/8-12  
- 28 1-3/4" 2-1/4-12  
- 32 2" 2-1/2-12  


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