{
 "version": "2026-10-20",
 "license": "Dimension sheets: CC BY 4.0. Standard and published-size files: CC BY 4.0. Xem Studio's own designs (files_license = Xem Studio Design License): free to use and sell things from, not to redistribute as files — https://xemstudio.com/license/. Other publishers' files: their own license, linked beside them.",
 "slug": "an-jic-37-degree-flare-fittings",
 "name": "AN and JIC 37° flare fittings: dash sizes -3 to -20, thread, tube OD, hose ID, flare diameter",
 "kind": "standard",
 "category": "Tri-clamp & pipe",
 "group": "Pipe, tube & threads",
 "year": null,
 "question": "What thread, tube OD and hose size is an AN -6 or -8 fitting?",
 "tags": [
  "AN",
  "JIC",
  "37 degree flare",
  "hydraulic",
  "fuel line",
  "automotive",
  "thread",
  "fitting",
  "tool"
 ],
 "aliases": [
  "an6 thread size",
  "-8 an fitting",
  "an fitting size chart",
  "an to thread chart",
  "jic 37 degree dimensions",
  "-6 an 9/16-18",
  "an vs npt",
  "an hose id",
  "an tube od",
  "-10 an thread",
  "jic vs sae 45",
  "an wrench size"
 ],
 "overall_mm": {
  "length": null,
  "width": null,
  "height": null
 },
 "official_cad": false,
 "xem_status": "not-scanned",
 "les": false,
 "free_files": 0,
 "url": "https://xemstudio.com/objects/an-jic-37-degree-flare-fittings/",
 "sheet_txt": "https://xemstudio.com/objects/an-jic-37-degree-flare-fittings/sheet.txt",
 "sheet": {
  "basis": "AN thread (Wikipedia), Chase Bays and Hardin Marine AN charts, Ham-Let SAE 37° flare catalogue (SAE J533 flare diameter, hexes); numbers only",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "AN (and JIC) fittings seal on a 37° flare: the dash number is the tube OD in sixteenths of an inch (-6 = 6/16 = 3/8 in), not a thread. -6 is 9/16-18 UNF, -8 is 3/4-16, -10 is 7/8-14, and so on; the same threads as SAE O-ring ports. 37° AN/JIC and 45° SAE flares do not interchange.",
   "Thread major diameters are the nominal diameter of the designation converted at 25.4 mm/in (a thread has a tolerance band). Hose ID is approximate: hose makers differ.",
   "Flare diameter is the SAE J533 single-flare diameter range for the tube OD as printed by Ham-Let (UCT) in its 37° flare catalogue (inch values 0.26–0.28, 0.34–0.36, 0.46–0.49, 0.63–0.66, 1.17–1.20 converted to mm); wrench sizes are that maker's nut and connector hexes, and other makers differ. Charts for the other dashes did not print them.",
   "Left out, no file: hex thickness, thread length and nose length are not printed in the charts we could read (Ham-Let prints thread, hex flats and overall length of its connectors, not the hex position), so no flare envelope is published."
  ],
  "table": {
   "columns": [
    "AN size",
    "thread (UNF/UN)",
    "tube OD",
    "hose ID",
    "flare angle",
    "SAE J533 flare dia A (mm)",
    "wrench hex (in, Ham-Let)"
   ],
   "rows": [
    [
     "-3",
     "3/8-24 (major 9.52 mm)",
     "3/16 (4.76 mm)",
     "1/8 (approx.)",
     "37°",
     "6.61–7.11",
     "-"
    ],
    [
     "-4",
     "7/16-20 (major 11.11 mm)",
     "1/4 (6.35 mm)",
     "3/16 (approx.)",
     "37°",
     "8.64–9.14",
     "9/16 (nut and connector)"
    ],
    [
     "-5",
     "1/2-20 (major 12.70 mm)",
     "5/16 (7.94 mm)",
     "1/4 (approx.)",
     "37°",
     "-",
     "-"
    ],
    [
     "-6",
     "9/16-18 (major 14.29 mm)",
     "3/8 (9.52 mm)",
     "5/16 (approx.)",
     "37°",
     "11.69–12.44",
     "-"
    ],
    [
     "-8",
     "3/4-16 (major 19.05 mm)",
     "1/2 (12.70 mm)",
     "7/16 (approx.)",
     "37°",
     "16.01–16.76",
     "7/8 (nut and connector)"
    ],
    [
     "-10",
     "7/8-14 (major 22.22 mm)",
     "5/8 (15.88 mm)",
     "1/2 (approx.)",
     "37°",
     "-",
     "-"
    ],
    [
     "-12",
     "1-1/16-12 (major 26.99 mm)",
     "3/4 (19.05 mm)",
     "5/8 (approx.)",
     "37°",
     "-",
     "-"
    ],
    [
     "-16",
     "1-5/16-12 (major 33.34 mm)",
     "1 (25.40 mm)",
     "7/8 (approx.)",
     "37°",
     "29.72–30.48",
     "1-1/2 nut / 1-3/8 connector"
    ],
    [
     "-20",
     "1-5/8-12 (major 41.27 mm)",
     "1-1/4 (31.75 mm)",
     "1-1/8 (approx.)",
     "37°",
     "-",
     "-"
    ]
   ]
  }
 },
 "sheet_text": "AN and JIC 37° flare fittings: dash sizes -3 to -20, thread, tube OD, hose ID, flare diameter — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/an-jic-37-degree-flare-fittings/  (sheet CC BY 4.0)\nBasis: AN thread (Wikipedia), Chase Bays and Hardin Marine AN charts, Ham-Let SAE 37° flare catalogue (SAE J533 flare diameter, hexes); numbers only\nCatalog version: 2026-10-20\n\nSizes: see table below\n- AN (and JIC) fittings seal on a 37° flare: the dash number is the tube OD in sixteenths of an inch (-6 = 6/16 = 3/8 in), not a thread. -6 is 9/16-18 UNF, -8 is 3/4-16, -10 is 7/8-14, and so on; the same threads as SAE O-ring ports. 37° AN/JIC and 45° SAE flares do not interchange.\n- Thread major diameters are the nominal diameter of the designation converted at 25.4 mm/in (a thread has a tolerance band). Hose ID is approximate: hose makers differ.\n- Flare diameter is the SAE J533 single-flare diameter range for the tube OD as printed by Ham-Let (UCT) in its 37° flare catalogue (inch values 0.26–0.28, 0.34–0.36, 0.46–0.49, 0.63–0.66, 1.17–1.20 converted to mm); wrench sizes are that maker's nut and connector hexes, and other makers differ. Charts for the other dashes did not print them.\n- Left out, no file: hex thickness, thread length and nose length are not printed in the charts we could read (Ham-Let prints thread, hex flats and overall length of its connectors, not the hex position), so no flare envelope is published.\n\nAN size  thread (UNF/UN)  tube OD  hose ID  flare angle  SAE J533 flare dia A (mm)  wrench hex (in, Ham-Let)\n-3  3/8-24 (major 9.52 mm)  3/16 (4.76 mm)  1/8 (approx.)  37°  6.61–7.11  -\n-4  7/16-20 (major 11.11 mm)  1/4 (6.35 mm)  3/16 (approx.)  37°  8.64–9.14  9/16 (nut and connector)\n-5  1/2-20 (major 12.70 mm)  5/16 (7.94 mm)  1/4 (approx.)  37°  -  -\n-6  9/16-18 (major 14.29 mm)  3/8 (9.52 mm)  5/16 (approx.)  37°  11.69–12.44  -\n-8  3/4-16 (major 19.05 mm)  1/2 (12.70 mm)  7/16 (approx.)  37°  16.01–16.76  7/8 (nut and connector)\n-10  7/8-14 (major 22.22 mm)  5/8 (15.88 mm)  1/2 (approx.)  37°  -  -\n-12  1-1/16-12 (major 26.99 mm)  3/4 (19.05 mm)  5/8 (approx.)  37°  -  -\n-16  1-5/16-12 (major 33.34 mm)  1 (25.40 mm)  7/8 (approx.)  37°  29.72–30.48  1-1/2 nut / 1-3/8 connector\n-20  1-5/8-12 (major 41.27 mm)  1-1/4 (31.75 mm)  1-1/8 (approx.)  37°  -  -\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- Wikipedia: AN thread (sizes, 37° flare) — web — Publisher's page; dimensions are facts — https://en.wikipedia.org/wiki/AN_thread\n- Chase Bays: AN plumbing info and thread chart — web — Publisher's page; dimensions are facts — https://www.chasebays.com/pages/an-plumbing-info-and-thread-chart\n- Hardin Marine: AN fitting size guide — web — Publisher's page; dimensions are facts — https://www.hardin-marine.com/t-an-fittings-guide.aspx\n- Ham-Let (UCT): SAE 37° flare 3-piece tube assembly catalogue, Jan 2025 (J533 flare dia, nut and connector hexes) — web — Publisher's page; dimensions are facts — https://s29.q4cdn.com/619069826/files/doc_downloads/2025/Jan/SAE37-FLARE-2025.pdf\n\nNo true-size file yet: the published figures do not fix the whole shape; a measured scan is planned.\nAPI: https://xemstudio.com/api/geometry?object=an-jic-37-degree-flare-fittings\n",
 "sources": [
  {
   "publisher": "Wikipedia",
   "title": "AN thread (sizes, 37° flare)",
   "url": "https://en.wikipedia.org/wiki/AN_thread",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Chase Bays",
   "title": "AN plumbing info and thread chart",
   "url": "https://www.chasebays.com/pages/an-plumbing-info-and-thread-chart",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Hardin Marine",
   "title": "AN fitting size guide",
   "url": "https://www.hardin-marine.com/t-an-fittings-guide.aspx",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Ham-Let (UCT)",
   "title": "SAE 37° flare 3-piece tube assembly catalogue, Jan 2025 (J533 flare dia, nut and connector hexes)",
   "url": "https://s29.q4cdn.com/619069826/files/doc_downloads/2025/Jan/SAE37-FLARE-2025.pdf",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  }
 ],
 "xem": {
  "status": "not-scanned",
  "sheet_free": true,
  "mesh_price_usd": null,
  "step_price_usd": null,
  "tolerance_mm": null
 },
 "related": [
  "npt-thread-envelopes",
  "bsp-thread-envelopes",
  "push-fit-fittings",
  "hose-barbs"
 ],
 "fits": [],
 "dimensions": "exact (nominal, no printing tolerance)",
 "dimension_rule": "All geometry on Xem Studio is exact (nominal, true size) with no printing tolerance. Where a part meets another part, the object lists its mating features (feature, exact size, what it mates with, fit class: press, slide, run, socket, clamp or designed). Apply your process's allowance to those features only; 'designed' gaps are part of the design and stay as drawn.",
 "mating": [],
 "faq": [
  {
   "q": "What thread is -6 AN?",
   "a": "9/16-18 UNF (14.29 mm major), for 3/8 in tube; hose ID about 5/16 in."
  },
  {
   "q": "Are AN and JIC the same?",
   "a": "Both use a 37° flare and the same threads; JIC is the SAE J514 hydraulic version of AN. 45° SAE flares are different and do not interchange."
  }
 ],
 "files_license": null,
 "offers": [],
 "markdown": "https://xemstudio.com/objects/an-jic-37-degree-flare-fittings/index.md"
}