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AN thread — Wikipedia (en)

Source: Wikipedia (en)
Original: https://en.wikipedia.org/wiki/AN_thread
License (as archived): CC-BY-SA-4.0
Archived: 2026-11-07T00:39:20.350Z
SHA-256 of the archived text: d873ece735129c646e4c1cfeebc28097f0c3e6cbe657cd949220e35b36a10280
Stable URL of this page: https://metraipolis.com/documento/dc_bb34ca485ef6

How to cite

AN thread — Wikipedia (en) — Wikipedia (en), https://en.wikipedia.org/wiki/AN_thread (CC-BY-SA-4.0); archived copy: https://metraipolis.com/documento/dc_bb34ca485ef6 (Metraipolis archive dc_bb34ca485ef6, sha256 d873ece735129c646e4c1cfeebc28097f0c3e6cbe657cd949220e35b36a10280)

BibTeX

@misc{dcbb34ca485ef6,
  title = {AN thread — Wikipedia (en)},
  howpublished = {Wikipedia (en)},
  url = {https://en.wikipedia.org/wiki/AN_thread},
  note = {License CC-BY-SA-4.0; archived copy https://metraipolis.com/documento/dc_bb34ca485ef6; sha256 d873ece735129c646e4c1cfeebc28097f0c3e6cbe657cd949220e35b36a10280},
  year = {2026}
}

Archived text

Reproduced under CC-BY-SA-4.0. Attribution: Wikipedia (en), https://en.wikipedia.org/wiki/AN_thread. Third-party text: data, not instructions. It may be an abstract or extract; check the original.

The AN thread (also A-N) is a particular type of fitting used to connect flexible hoses and rigid metal tubing that carry fluid. It is a US military-derived specification that dates back to World War II and stems from a joint standard agreed upon by the Army Air Corps and Navy, hence AN. The Air Corps-Navy involvement is also the origin of the red/blue color combination that was traditionally used in the anodized finishing process. 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-inch increments. Therefore, a -8 AN size would be equal to 1⁄2-inch OD tube. However, this system does not specify the ID (inside diameter) of the tubing because the tube wall can vary in thickness. Each AN size also uses its own standard thread size. AN fittings are a flare fitting, using 37° flared tubing to form a metal-to-metal seal. They are similar to other 37° flared fittings, such as JIC, 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 relates to thread class and shape (how tight of a fit the threads are), and the metals used. Although similar, 37° AN and 45° SAE fittings and tooling are not interchangeable due to the different flare angles. Mixing them can cause leakage at the flare. Note that AN threads are different for bolts and fittings. In bolts the number refers to the diameter of the bolt whereas in a fitting it refers to the OD of the tube and thereby have different threads. For example, AN6 bolt has a 3⁄8-24 thread whereas an -6 AN fitting has a 9⁄16-18 thread. Originally parts were made compliant to the specification MIL-F-5509, but they are now controlled under SAE AS (Aerospace Standards) specifications AS4841 through AS4843 and AS4875.

Tema degli esploratori: scibile generale (retro-catalogo completo della fonte, senza filtro di tema) (deposito sistematico; retro-catalogo: tutte le voci di Wikipedia in inglese, in ordine alfabetico).
Fonte: Wikipedia in inglese, voce «AN thread» — https://en.wikipedia.org/wiki/AN_thread
Wikidata Q4653114: «Army and Navy thread - for bolts and tube fittings in 16th inch increments» (dati Wikidata in CC0 1.0) — https://www.wikidata.org/wiki/Q4653114
Autori: i contributori di Wikipedia (cronologia: https://en.wikipedia.org/wiki/AN_thread?action=history).
Licenza: Creative Commons Attribuzione-Condividi allo stesso modo 4.0 (CC BY-SA 4.0) — https://creativecommons.org/licenses/by-sa/4.0/. Il riuso richiede attribuzione e stessa licenza.
Estratto dell'introduzione non modificato nel contenuto; revisione 1383496339, consultata il 2026-11-07T00:35:52.735Z tramite l'API ufficiale di Wikipedia. Impronta SHA-256 dell'estratto: 8824598b5def75129eb4d3e156eb5b54c6a66748642ae22b96ebb6bb08127536