{
 "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": "brass-compression-nuts-inch",
 "name": "Brass compression fittings (inch tube): tube OD, nut thread, hex and length, 1/8 to 7/8 in",
 "kind": "standard",
 "category": "Tri-clamp & pipe",
 "group": "Pipe, tube & threads",
 "year": null,
 "question": "What thread and hex size does a brass compression nut have for each tube OD?",
 "tags": [
  "compression",
  "brass",
  "nut",
  "sleeve",
  "ferrule",
  "tube",
  "thread",
  "fitting",
  "copper",
  "standard"
 ],
 "aliases": [
  "compression nut thread size",
  "1/4 compression nut 7/16-24",
  "3/8 compression fitting thread 9/16-24",
  "1/2 compression nut 11/16-20",
  "compression nut hex size",
  "brass compression nut dimensions",
  "compression fitting nut length",
  "5/8 compression nut thread",
  "1/8 compression nut 5/16-24",
  "compression nut stl",
  "compression fitting vs flare thread",
  "3/4 compression nut 1-18",
  "compression nut wrench size"
 ],
 "overall_mm": {
  "length": null,
  "width": null,
  "height": null
 },
 "official_cad": false,
 "xem_status": "free-files",
 "les": false,
 "free_files": 10,
 "url": "https://xemstudio.com/objects/brass-compression-nuts-inch/",
 "sheet_txt": "https://xemstudio.com/objects/brass-compression-nuts-inch/sheet.txt",
 "sheet": {
  "basis": "JB-style brass compression catalogue (Buy Fittings Online pp. 71-72) with SC Fastening and Compressor Source thread cross-checks; McMaster-Carr linked for CAD",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "A compression fitting grips a plain tube with a brass sleeve (ferrule) squeezed by the nut; the nut thread is a straight UN thread cut for the tube OD, and the tube must be a round OD with no flare. Sizes are tube OD in inches (1/8 to 7/8 in). Threads: 1/8 in 5/16-24, 3/16 in 3/8-24, 1/4 in 7/16-24, 5/16 in 1/2-24, 3/8 in 9/16-24, 7/16 in 5/8-24, 1/2 in 11/16-20, 5/8 in 13/16-18, 3/4 in 1-18, 7/8 in 1-1/8-18.",
   "Numbers: the nut table (thread, A, hex) and the sleeve table are from a JB-style brass fittings catalogue (Buy Fittings Online, pages 71-72). The tube-OD-to-thread pairs repeat in SC Fastening's catalogue (its names for the same parts: 1/8 in tube 5/16-24, ... 3/4 in 1-18; for 7/8 in it prints '1-1/18-18', an apparent typo for 1-1/8-18) and Compressor Source's 1/4 in nut (7/16-24). A and hex have one source: the page's own table. The light pattern ('L' parts) is shorter and has a smaller hex for 1/2 in and 5/8 in; both are shown. The same catalogue's separate 'brass nut' table gives 1/4 in A 0.44 hex 0.50, 3/8 in 0.40 / 0.62, 1/2 in 0.48 / 0.75, 5/8 in 0.56 / 0.94, which differ from the ferrule-table nuts for 3/8 and 1/2 and 5/8; a different nut style, not used.",
   "Sleeve columns: the sleeve table has no header; A and B are taken from its diagram and their meaning is unconfirmed (B grows with tube OD, so it is probably the sleeve OD and A the length). No sleeve files are made. Tube insertion depth is not given by the catalogue (it says only that the tube is bottomed on the fitting shoulder), so none is listed.",
   "Do not confuse with flare nuts: 1/4 in flare is 7/16-20, 1/4 in compression is 7/16-24 (see 'sae-45-degree-flare-nuts-and-threads'). McMaster-Carr's compression page (linked) offers inch tube ODs from 1/16 to 1 in and metric 4 to 28 mm; its thread list is not mapped to tube sizes on the page, so it was not used for a cross-check.",
   "Files (10): hex envelopes, one per tube size: hex across flats × length A, a through hole at the tube OD. No internal thread, sleeve seat or chamfer.",
   "Left out: metric compression fittings 6 to 22 mm (a Legris catalogue was read but its column labels could not be matched to dimensions; EN 1254 olive tables were not found), sleeve and body profiles, male / female NPT bodies, working pressures and insertion depth."
  ],
  "table": {
   "columns": [
    "tube OD, in (mm)",
    "nut thread, UN (major, mm)",
    "nut length A, in (mm)",
    "nut hex, in (mm)",
    "light-pattern nut A / hex, in",
    "sleeve A / B, in (labels unconfirmed)"
   ],
   "rows": [
    [
     "1/8 (3.17)",
     "5/16-24 (major 7.94)",
     "0.38 (9.7)",
     "0.37 (9.4)",
     "—",
     "0.19 / 0.19"
    ],
    [
     "3/16 (4.76)",
     "3/8-24 (major 9.52)",
     "0.41 (10.4)",
     "0.43 (10.9)",
     "—",
     "0.22 / 0.27"
    ],
    [
     "1/4 (6.35)",
     "7/16-24 (major 11.11)",
     "0.44 (11.2)",
     "0.50 (12.7)",
     "0.44 / 0.50",
     "0.25 / 0.34"
    ],
    [
     "5/16 (7.94)",
     "1/2-24 (major 12.70)",
     "0.44 (11.2)",
     "0.56 (14.2)",
     "—",
     "0.25 / 0.41"
    ],
    [
     "3/8 (9.52)",
     "9/16-24 (major 14.29)",
     "0.47 (11.9)",
     "0.62 (15.7)",
     "0.47 / 0.62",
     "0.25 / 0.47"
    ],
    [
     "7/16 (11.11)",
     "5/8-24 (major 15.88)",
     "0.50 (12.7)",
     "0.68 (17.3)",
     "—",
     "0.31 / 0.53"
    ],
    [
     "1/2 (12.70)",
     "11/16-20 (major 17.46)",
     "0.62 (15.7)",
     "0.81 (20.6)",
     "0.56 / 0.75",
     "0.38 / 0.59"
    ],
    [
     "5/8 (15.88)",
     "13/16-18 (major 20.64)",
     "0.62 (15.7)",
     "0.94 (23.9)",
     "0.56 / 0.87",
     "0.38 / 0.71"
    ],
    [
     "3/4 (19.05)",
     "1-18 (major 25.40)",
     "0.68 (17.3)",
     "1.12 (28.4)",
     "—",
     "0.44 / 0.87"
    ],
    [
     "7/8 (22.22)",
     "1-1/8-18 (major 28.57)",
     "0.62 (15.7)",
     "1.25 (31.8)",
     "—",
     "0.41 / 0.99"
    ]
   ]
  }
 },
 "sheet_text": "Brass compression fittings (inch tube): tube OD, nut thread, hex and length, 1/8 to 7/8 in — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/brass-compression-nuts-inch/  (sheet CC BY 4.0)\nBasis: JB-style brass compression catalogue (Buy Fittings Online pp. 71-72) with SC Fastening and Compressor Source thread cross-checks; McMaster-Carr linked for CAD\nCatalog version: 2026-10-20\n\nSizes: see table below\n- A compression fitting grips a plain tube with a brass sleeve (ferrule) squeezed by the nut; the nut thread is a straight UN thread cut for the tube OD, and the tube must be a round OD with no flare. Sizes are tube OD in inches (1/8 to 7/8 in). Threads: 1/8 in 5/16-24, 3/16 in 3/8-24, 1/4 in 7/16-24, 5/16 in 1/2-24, 3/8 in 9/16-24, 7/16 in 5/8-24, 1/2 in 11/16-20, 5/8 in 13/16-18, 3/4 in 1-18, 7/8 in 1-1/8-18.\n- Numbers: the nut table (thread, A, hex) and the sleeve table are from a JB-style brass fittings catalogue (Buy Fittings Online, pages 71-72). The tube-OD-to-thread pairs repeat in SC Fastening's catalogue (its names for the same parts: 1/8 in tube 5/16-24, ... 3/4 in 1-18; for 7/8 in it prints '1-1/18-18', an apparent typo for 1-1/8-18) and Compressor Source's 1/4 in nut (7/16-24). A and hex have one source: the page's own table. The light pattern ('L' parts) is shorter and has a smaller hex for 1/2 in and 5/8 in; both are shown. The same catalogue's separate 'brass nut' table gives 1/4 in A 0.44 hex 0.50, 3/8 in 0.40 / 0.62, 1/2 in 0.48 / 0.75, 5/8 in 0.56 / 0.94, which differ from the ferrule-table nuts for 3/8 and 1/2 and 5/8; a different nut style, not used.\n- Sleeve columns: the sleeve table has no header; A and B are taken from its diagram and their meaning is unconfirmed (B grows with tube OD, so it is probably the sleeve OD and A the length). No sleeve files are made. Tube insertion depth is not given by the catalogue (it says only that the tube is bottomed on the fitting shoulder), so none is listed.\n- Do not confuse with flare nuts: 1/4 in flare is 7/16-20, 1/4 in compression is 7/16-24 (see 'sae-45-degree-flare-nuts-and-threads'). McMaster-Carr's compression page (linked) offers inch tube ODs from 1/16 to 1 in and metric 4 to 28 mm; its thread list is not mapped to tube sizes on the page, so it was not used for a cross-check.\n- Files (10): hex envelopes, one per tube size: hex across flats × length A, a through hole at the tube OD. No internal thread, sleeve seat or chamfer.\n- Left out: metric compression fittings 6 to 22 mm (a Legris catalogue was read but its column labels could not be matched to dimensions; EN 1254 olive tables were not found), sleeve and body profiles, male / female NPT bodies, working pressures and insertion depth.\n\ntube OD, in (mm)  nut thread, UN (major, mm)  nut length A, in (mm)  nut hex, in (mm)  light-pattern nut A / hex, in  sleeve A / B, in (labels unconfirmed)\n1/8 (3.17)  5/16-24 (major 7.94)  0.38 (9.7)  0.37 (9.4)  —  0.19 / 0.19\n3/16 (4.76)  3/8-24 (major 9.52)  0.41 (10.4)  0.43 (10.9)  —  0.22 / 0.27\n1/4 (6.35)  7/16-24 (major 11.11)  0.44 (11.2)  0.50 (12.7)  0.44 / 0.50  0.25 / 0.34\n5/16 (7.94)  1/2-24 (major 12.70)  0.44 (11.2)  0.56 (14.2)  —  0.25 / 0.41\n3/8 (9.52)  9/16-24 (major 14.29)  0.47 (11.9)  0.62 (15.7)  0.47 / 0.62  0.25 / 0.47\n7/16 (11.11)  5/8-24 (major 15.88)  0.50 (12.7)  0.68 (17.3)  —  0.31 / 0.53\n1/2 (12.70)  11/16-20 (major 17.46)  0.62 (15.7)  0.81 (20.6)  0.56 / 0.75  0.38 / 0.59\n5/8 (15.88)  13/16-18 (major 20.64)  0.62 (15.7)  0.94 (23.9)  0.56 / 0.87  0.38 / 0.71\n3/4 (19.05)  1-18 (major 25.40)  0.68 (17.3)  1.12 (28.4)  —  0.44 / 0.87\n7/8 (22.22)  1-1/8-18 (major 28.57)  0.62 (15.7)  1.25 (31.8)  —  0.41 / 0.99\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- Buy Fittings Online (catalogue p. 71-72): Brass compression fittings: nut and sleeve tables, tube OD and thread size — web — Publisher's page; dimensions are facts — https://www.buyfittingsonline.com/content/Compression-Fittings-Brass-Web.pdf\n- SC Fastening (JB-style catalogue): Compression brass nut list: tube OD and thread size by part (cross-check of the thread column) — web — Publisher's page; dimensions are facts — https://catalog.scfastening.com/viewitems/bing-brass-fittings-compression-fittings-1/bing-brass-fittings-compression-fittings-brass-nut?plpver=10\n- Compressor Source: 1/4 in compression nut, 7/16-24 thread (cross-check) — web — Publisher's page; dimensions are facts — https://compressor-source.com/products/1-4-compression-nut-hex-shape-7-16-24-thread-size-solid-brass-fitting-new\n- McMaster-Carr: Brass compression tube fittings (free STEP/IGES per part, for your own design use; no redistribution) — STEP, IGES, PDF — McMaster-Carr site terms: personal design use, no redistribution [verify license at link] — https://www.mcmaster.com/brass-compression-tube-fittings\n\nFree files (CC BY 4.0, Xem Studio; STEP + STL, 10 parts): https://xemstudio.com/files/hardware/brass-compression-nuts-inch/index.json\nAPI: https://xemstudio.com/api/geometry?object=brass-compression-nuts-inch\n",
 "sources": [
  {
   "publisher": "Buy Fittings Online (catalogue p. 71-72)",
   "title": "Brass compression fittings: nut and sleeve tables, tube OD and thread size",
   "url": "https://www.buyfittingsonline.com/content/Compression-Fittings-Brass-Web.pdf",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "SC Fastening (JB-style catalogue)",
   "title": "Compression brass nut list: tube OD and thread size by part (cross-check of the thread column)",
   "url": "https://catalog.scfastening.com/viewitems/bing-brass-fittings-compression-fittings-1/bing-brass-fittings-compression-fittings-brass-nut?plpver=10",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Compressor Source",
   "title": "1/4 in compression nut, 7/16-24 thread (cross-check)",
   "url": "https://compressor-source.com/products/1-4-compression-nut-hex-shape-7-16-24-thread-size-solid-brass-fitting-new",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "McMaster-Carr",
   "title": "Brass compression tube fittings (free STEP/IGES per part, for your own design use; no redistribution)",
   "url": "https://www.mcmaster.com/brass-compression-tube-fittings",
   "formats": [
    "STEP",
    "IGES",
    "PDF"
   ],
   "license": "McMaster-Carr site terms: personal design use, no redistribution",
   "license_verified": false,
   "hosted": false
  }
 ],
 "xem": {
  "status": "free-files",
  "sheet_free": true,
  "mesh_price_usd": null,
  "step_price_usd": null,
  "tolerance_mm": null
 },
 "related": [
  "sae-45-degree-flare-nuts-and-threads",
  "an-jic-37-degree-flare-fittings",
  "copper-pipe-type-l-m",
  "push-to-connect-fitting-sizes",
  "silicone-tube",
  "npt-thread-envelopes"
 ],
 "fits": [],
 "dimensions": "exact (nominal, no tolerance added)",
 "dimension_rule": "All geometry on Xem Studio is exact (nominal, true size) with no tolerance added. 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. Typical accuracy by process and ISO 286 fits: https://xemstudio.com/tolerances/",
 "mating": [],
 "faq": [
  {
   "q": "What thread is a 1/4 in brass compression nut?",
   "a": "7/16-24 UN, 0.50 in hex, 0.44 in long (JB-style catalogue); the 1/4 in flare nut is 7/16-20 instead."
  },
  {
   "q": "What size is a 1/2 in compression nut?",
   "a": "11/16-20 thread, 0.81 in hex and 0.62 in long standard pattern; light pattern 0.75 in hex and 0.56 in long."
  },
  {
   "q": "Is a compression nut the same thread as a flare nut?",
   "a": "No. 1/4 in tube: compression 7/16-24, SAE flare 7/16-20. 3/8 in tube: compression 9/16-24, flare 5/8-18."
  }
 ],
 "files_license": null,
 "offers": [
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   "file": "compression-nut-1-8in-tube-5-16-24",
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   ],
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   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/brass-compression-nuts-inch/compression-nut-1-8in-tube-5-16-24.step",
   "stl": "https://xemstudio.com/files/hardware/brass-compression-nuts-inch/compression-nut-1-8in-tube-5-16-24.stl",
   "note": "Brass compression nut envelope, 1/8 in tube: hex 0.37 in across flats × 0.38 in long, tube bore Ø3.17 mm (= tube OD); thread 5/16-24 is on the part but NOT drawn (internal thread and the sleeve seat are not published); standard pattern (the light-pattern nut is shorter, see page)"
  },
  {
   "file": "compression-nut-3-16in-tube-3-8-24",
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   "license": "CC BY 4.0 (Xem Studio)",
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   "stl": "https://xemstudio.com/files/hardware/brass-compression-nuts-inch/compression-nut-3-16in-tube-3-8-24.stl",
   "note": "Brass compression nut envelope, 3/16 in tube: hex 0.43 in across flats × 0.41 in long, tube bore Ø4.76 mm (= tube OD); thread 3/8-24 is on the part but NOT drawn (internal thread and the sleeve seat are not published); standard pattern (the light-pattern nut is shorter, see page)"
  },
  {
   "file": "compression-nut-1-4in-tube-7-16-24",
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    "step",
    "stl"
   ],
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   "license": "CC BY 4.0 (Xem Studio)",
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   "stl": "https://xemstudio.com/files/hardware/brass-compression-nuts-inch/compression-nut-1-4in-tube-7-16-24.stl",
   "note": "Brass compression nut envelope, 1/4 in tube: hex 0.50 in across flats × 0.44 in long, tube bore Ø6.35 mm (= tube OD); thread 7/16-24 is on the part but NOT drawn (internal thread and the sleeve seat are not published); standard pattern (the light-pattern nut is shorter, see page)"
  },
  {
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   "stl": "https://xemstudio.com/files/hardware/brass-compression-nuts-inch/compression-nut-5-16in-tube-1-2-24.stl",
   "note": "Brass compression nut envelope, 5/16 in tube: hex 0.56 in across flats × 0.44 in long, tube bore Ø7.94 mm (= tube OD); thread 1/2-24 is on the part but NOT drawn (internal thread and the sleeve seat are not published); standard pattern (the light-pattern nut is shorter, see page)"
  },
  {
   "file": "compression-nut-3-8in-tube-9-16-24",
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    "step",
    "stl"
   ],
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   "license": "CC BY 4.0 (Xem Studio)",
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   "stl": "https://xemstudio.com/files/hardware/brass-compression-nuts-inch/compression-nut-3-8in-tube-9-16-24.stl",
   "note": "Brass compression nut envelope, 3/8 in tube: hex 0.62 in across flats × 0.47 in long, tube bore Ø9.52 mm (= tube OD); thread 9/16-24 is on the part but NOT drawn (internal thread and the sleeve seat are not published); standard pattern (the light-pattern nut is shorter, see page)"
  },
  {
   "file": "compression-nut-7-16in-tube-5-8-24",
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   "stl": "https://xemstudio.com/files/hardware/brass-compression-nuts-inch/compression-nut-7-16in-tube-5-8-24.stl",
   "note": "Brass compression nut envelope, 7/16 in tube: hex 0.68 in across flats × 0.50 in long, tube bore Ø11.11 mm (= tube OD); thread 5/8-24 is on the part but NOT drawn (internal thread and the sleeve seat are not published); standard pattern (the light-pattern nut is shorter, see page)"
  },
  {
   "file": "compression-nut-1-2in-tube-11-16-20",
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   "stl": "https://xemstudio.com/files/hardware/brass-compression-nuts-inch/compression-nut-1-2in-tube-11-16-20.stl",
   "note": "Brass compression nut envelope, 1/2 in tube: hex 0.81 in across flats × 0.62 in long, tube bore Ø12.70 mm (= tube OD); thread 11/16-20 is on the part but NOT drawn (internal thread and the sleeve seat are not published); standard pattern (the light-pattern nut is shorter, see page)"
  },
  {
   "file": "compression-nut-5-8in-tube-13-16-18",
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    "step",
    "stl"
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   "stl": "https://xemstudio.com/files/hardware/brass-compression-nuts-inch/compression-nut-5-8in-tube-13-16-18.stl",
   "note": "Brass compression nut envelope, 5/8 in tube: hex 0.94 in across flats × 0.62 in long, tube bore Ø15.88 mm (= tube OD); thread 13/16-18 is on the part but NOT drawn (internal thread and the sleeve seat are not published); standard pattern (the light-pattern nut is shorter, see page)"
  },
  {
   "file": "compression-nut-3-4in-tube-1-18",
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   "stl": "https://xemstudio.com/files/hardware/brass-compression-nuts-inch/compression-nut-3-4in-tube-1-18.stl",
   "note": "Brass compression nut envelope, 3/4 in tube: hex 1.12 in across flats × 0.68 in long, tube bore Ø19.05 mm (= tube OD); thread 1-18 is on the part but NOT drawn (internal thread and the sleeve seat are not published); standard pattern (the light-pattern nut is shorter, see page)"
  },
  {
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    "step",
    "stl"
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   "license": "CC BY 4.0 (Xem Studio)",
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   "stl": "https://xemstudio.com/files/hardware/brass-compression-nuts-inch/compression-nut-7-8in-tube-1-1-8-18.stl",
   "note": "Brass compression nut envelope, 7/8 in tube: hex 1.25 in across flats × 0.62 in long, tube bore Ø22.22 mm (= tube OD); thread 1-1/8-18 is on the part but NOT drawn (internal thread and the sleeve seat are not published); standard pattern (the light-pattern nut is shorter, see page)"
  }
 ],
 "markdown": "https://xemstudio.com/objects/brass-compression-nuts-inch/index.md"
}