Glossary Term: AC
Meaning: Air Corp
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The AC flare fittings were developed for the aviation industry in the 1930s, and have long since been superceded by AN. AC fittings use a 30° flare angle, and they are most readily recognizable by a very short or non-existent straight section between the top of the thread (on the male fitting) and the major diameter of the flare. Most flare fittings of the other types have a non-threaded section at the base of the flare.