An Fittings Adapters is normally used to connect SAE standard of hydraulic tubing and hose assemblies system. AN (Air Force - Navy Aeronautical Standard) and AND (Air Force - Navy Aeronautical Design Standard) are standards used by the U.S. Military in aviation applications. AN fittings are manufactured to meet above standards. These fittings include the 37°flare, flare-less, hose connections, "banjo" type fittings, specialized flange fittings, pipe fittings and other types of connections.
An fittings adapters type is commonly used in Many aircraft/aerospace applications are moving towards aluminum and titanium for optimized weight-to-strength parameters.
Standards of New An Fittings Adapter is as per Procurement Specification AS4841B Fittings, 37° Internal Flare, Fluid Connection: This SAE Aerospace Standard (AS) establishes the requirements for 37° flared tube fittings or machined internal cone fluid connection fittings for use with 37° external cone, spherical nose and seal ring fittings in all types of aerospace fluid systems.
Old version of AN flare fittings conform to MIL-F-5509 specifications, and also AS4841through AS4843 and AS4975. AN fittings remain prevalent today. However, the U.S. Military is canceling many of the true AN/AND standards and replacing them with AS (Aerospace Standards) standards developed, again, by SAE. SAE/ISO 37°Flare: Some fittings conform to MIL-F-18866 as shown on MS51500 through MS51534.
An Size | -2 | -3 | -4 | -5 | -6 | -8 | -10 | -12 | -16 | -20 | -24 | -28 | -32 |
Tube OD | 1/8" | 3/16" | 1/4" | 5/16" | 3/8" | 1/2" | 5/8" | 3/4" | 1" | 1 1/4" | 1 1/2" | 1 3/4" | 2" |
Nominal Hose ID | 1/8" | 3/16" | 1/4" | 5/16" | 3/8" | 1/2" | 5/8" | 3/4" | 1" | 1 1/4" | 1 1/2" | 1 3/4" | 2" |
Actual Hose ID | 1/16" | 1/8" | 3/16" | 1/4" | 5/16" | 7/16" | 1/2" | 5/8" | 7/8" | 1 1/8" | 1 3/8" | 1 5/8" | 1 3/4" |
Thread | 5/16-24 | 3/8-24 | 7/16-20 | 1/2-20 | 9/16-18 | 3/4-16 | 7/8-14 | 1-1/16-12 | 1-5/16-12 | 1-5/8-12 | 1-7/8-12 | 2-1/4-12 | 2-1/2-12 |
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