{
 "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": "forged-socket-weld-fittings-b16-11",
 "name": "Forged socket-weld fittings (ASME B16.11), Class 3000 and 6000: elbows, tees, couplings — socket bore, depth, centre-to-bottom",
 "kind": "standard",
 "category": "Tri-clamp & pipe",
 "group": "Pipe, tube & threads",
 "year": null,
 "question": "What are the socket dimensions of a Class 3000 socket-weld elbow, tee or coupling (bore, depth, centre-to-bottom)?",
 "tags": [
  "pipe",
  "pipe fitting",
  "forged",
  "socket weld",
  "elbow",
  "tee",
  "coupling",
  "b16.11",
  "class 3000",
  "class 6000",
  "standard"
 ],
 "aliases": [
  "socket weld elbow dimensions",
  "socket weld fitting dimensions",
  "b16.11 socket weld",
  "socket weld elbow center to bottom",
  "class 3000 socket weld elbow",
  "3000 lb socket weld coupling",
  "socket weld tee dimensions",
  "socket weld depth",
  "sw fitting socket bore",
  "socket weld 1/2 inch dimensions",
  "forged steel socket weld 90",
  "socket weld fittings step file",
  "6000 lb socket weld elbow",
  "socket depth b16.11"
 ],
 "overall_mm": {
  "length": null,
  "width": null,
  "height": null
 },
 "official_cad": false,
 "xem_status": "free-files",
 "les": false,
 "free_files": 14,
 "url": "https://xemstudio.com/objects/forged-socket-weld-fittings-b16-11/",
 "sheet_txt": "https://xemstudio.com/objects/forged-socket-weld-fittings-b16-11/sheet.txt",
 "sheet": {
  "basis": "Wermac's ASME B16.11 socket-weld tables (mm: elbow, tee, coupling pages), cross-checked against the maker's inch catalog (Smith-Cooper 52-series); numbers and Xem-drawn envelopes",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "B16.11 socket-weld fittings take plain pipe in a socket: B is the socket bore (inside diameter of the socket), J the socket depth, D the bore of the fitting, C the socket wall, G the body wall and A the distance from the centre of the fitting to the bottom of the socket (centre-to-end = A + J). B, D and C are printed as two values, the first / second as headed in the table here (max / min as Wermac prints them). Wermac prints the letters in a different order on its coupling page; the tables here follow the elbow and tee pages, and the values are identical in all three.",
   "Cross-check: for every elbow, tee and coupling size A + J (converted to inches) lands within 0.04 in of the maker's overall centre-to-end A as Smith-Cooper prints it (the catalog text does not define its letters). Its elbow column B (read as the body width) compares with the drawn B(min) + 2 × C(min) as -0.8 to -0.2 mm for Class 3000 and -3.0 to -1.7 mm for Class 6000 (drawn minus printed). The coupling gap E (Wermac's laying-length column 'E', 9.5 / 13 / 19 mm) is the distance between the two socket bottoms: 2J + E is within 1 mm of Smith-Cooper's coupling length for all nine sizes (NPS 1/2: 29.5 mm vs 1.14 in = 29.0; NPS 4: 57 mm vs 2.25 in = 57.2). The 'check' columns below show the inch comparisons.",
   "Dropped as a misprint: Wermac prints D min = 46.4 for Class 3000 NPS 3 (next to D max 79.5); every other row has D min about 1.5–3 mm under D max, so the value is not used and no NPS 3 file is drawn. Tolerance of A as printed: ±1.5 mm (NPS 1/2 and 3/4), ±2 mm (NPS 1 to 2), ±2.5 mm (NPS 2-1/2 to 4).",
   "Files (Xem-drawn envelopes): a sphere and cylinders of outside diameter B(min) + 2 × C(min) meeting at the fitting centre, out to A + J on each arm; socket bore B(min) for the last J; bore D(min) from the socket bottom to the centre. The second printed value of B, C and D is used (the guaranteed minimum body; NPS 1/2 Class 3000: Ø29.9 drawn, the maker prints 1.20 in = 30.5 mm; the Class 6000 body is drawn smaller than the maker's by the range in the cross-check above). The true outside contour of a forged elbow or tee is not published as numbers, so the body is a cylinder-and-sphere envelope; the socket, the depth, the bore and the centre-to-bottom are the published values. Couplings: tube of that OD, length 2J + E.",
   "Half couplings, caps and reducing inserts are not tabulated here: the sources read give no defined centre dimension for them (Smith-Cooper A / B for socket-weld caps are printed without definitions).",
   "Socket bore vs pipe OD: Schedule 40 pipe OD is 21.34 / 26.67 / 33.40 / 42.16 / 48.26 / 60.33 mm at NPS 1/2 to 2, against socket bores of 21.70–21.95 / 27.05–27.30 / 33.80–34.05 / 42.55–42.80 / 48.65–48.90 / 61.10–61.35, i.e. 0.36–1.0 mm of clearance."
  ],
  "table": {
   "columns": [
    "class",
    "NPS",
    "socket bore B max / min",
    "socket depth J",
    "bore D max / min",
    "socket wall C max / min",
    "body wall G",
    "A 90° (centre to socket bottom)",
    "A 45°",
    "check: (A90+J) in vs maker A in",
    "check: (A45+J) in vs maker A in",
    "coupling gap E",
    "check: coupling length 2J+E vs maker"
   ],
   "rows": [
    [
     3000,
     "1/2",
     "21.95 / 21.70",
     "10",
     "16.6 / 15",
     "4.65 / 4.10",
     "3.75",
     "15.5",
     "11.5",
     "1.00 vs 1.00",
     "0.85 vs 0.82",
     "9.5",
     "29.5 (1.16 in) vs 1.14 in"
    ],
    [
     3000,
     "3/4",
     "27.30 / 27.05",
     "13",
     "21.7 / 20.2",
     "4.90 / 4.25",
     "3.9",
     "19.5",
     "12.5",
     "1.28 vs 1.25",
     "1.00 vs 1.00",
     "9.5",
     "35.5 (1.40 in) vs 1.38 in"
    ],
    [
     3000,
     "1",
     "34.05 / 33.80",
     "13",
     "27.4 / 25.9",
     "5.70 / 5.00",
     "4.55",
     "22",
     "14",
     "1.38 vs 1.38",
     "1.06 vs 1.06",
     "13",
     "39 (1.54 in) vs 1.50 in"
    ],
    [
     3000,
     "1-1/4",
     "42.80 / 42.55",
     "13",
     "35.8 / 34.3",
     "6.05 / 5.30",
     "4.85",
     "27",
     "17",
     "1.57 vs 1.56",
     "1.18 vs 1.19",
     "13",
     "39 (1.54 in) vs 1.50 in"
    ],
    [
     3000,
     "1-1/2",
     "48.90 / 48.65",
     "13",
     "41.7 / 40.1",
     "6.35 / 5.55",
     "5.1",
     "32",
     "21",
     "1.77 vs 1.75",
     "1.34 vs 1.31",
     "13",
     "39 (1.54 in) vs 1.50 in"
    ],
    [
     3000,
     "2",
     "61.35 / 61.10",
     "16",
     "53.5 / 51.7",
     "6.95 / 6.05",
     "5.55",
     "38",
     "25",
     "2.13 vs 2.12",
     "1.61 vs 1.62",
     "19",
     "51 (2.01 in) vs 2.00 in"
    ],
    [
     3000,
     "2-1/2",
     "74.20 / 73.80",
     "16",
     "64.2 / 61.2",
     "8.75 / 7.65",
     "7.0",
     "41.5",
     "29",
     "2.26 vs 2.24",
     "1.77 vs 1.74",
     "19",
     "51 (2.01 in) vs 2.00 in"
    ],
    [
     3000,
     "3",
     "90.15 / 89.80",
     "16",
     "79.5 / n/a (misprint)",
     "9.50 / 8.30",
     "7.6",
     "57.5",
     "31.5",
     "2.89 vs 2.87",
     "1.87 vs 1.87",
     "19",
     "51 (2.01 in) vs 2.00 in"
    ],
    [
     3000,
     "4",
     "115.80 / 115.45",
     "19",
     "103.8 / 100.7",
     "10.70 / 9.35",
     "8.55",
     "66.5",
     "41.5",
     "3.37 vs 3.37",
     "2.38 vs 2.37",
     "19",
     "57 (2.24 in) vs 2.25 in"
    ],
    [
     6000,
     "1/2",
     "21.95 / 21.70",
     "10",
     "12.5 / 11",
     "5.95 / 5.20",
     "4.8",
     "19.5",
     "12.5",
     "1.16 vs 1.13",
     "0.89 vs 0.88",
     "9.5",
     "—"
    ],
    [
     6000,
     "3/4",
     "27.30 / 27.05",
     "13",
     "16.3 / 14.8",
     "6.95 / 6.05",
     "5.55",
     "22.5",
     "14.5",
     "1.40 vs 1.38",
     "1.08 vs 1.06",
     "9.5",
     "—"
    ],
    [
     6000,
     "1",
     "34.05 / 33.80",
     "13",
     "21.5 / 19.9",
     "7.90 / 6.95",
     "6.35",
     "27",
     "17",
     "1.57 vs 1.56",
     "1.18 vs 1.19",
     "13",
     "—"
    ],
    [
     6000,
     "1-1/4",
     "42.80 / 42.55",
     "13",
     "30.2 / 28.7",
     "7.90 / 6.95",
     "6.35",
     "32",
     "21",
     "1.77 vs 1.75",
     "1.34 vs 1.31",
     "13",
     "—"
    ],
    [
     6000,
     "1-1/2",
     "48.90 / 48.65",
     "13",
     "34.7 / 33.2",
     "8.90 / 7.80",
     "7.15",
     "38",
     "25",
     "2.01 vs 2.00",
     "1.50 vs 1.50",
     "13",
     "—"
    ],
    [
     6000,
     "2",
     "61.35 / 61.10",
     "16",
     "43.6 / 42.1",
     "10.90 / 9.50",
     "8.75",
     "41",
     "29",
     "2.24 vs 2.24",
     "1.77 vs 1.74",
     "19",
     "—"
    ]
   ]
  }
 },
 "sheet_text": "Forged socket-weld fittings (ASME B16.11), Class 3000 and 6000: elbows, tees, couplings — socket bore, depth, centre-to-bottom — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/forged-socket-weld-fittings-b16-11/  (sheet CC BY 4.0)\nBasis: Wermac's ASME B16.11 socket-weld tables (mm: elbow, tee, coupling pages), cross-checked against the maker's inch catalog (Smith-Cooper 52-series); numbers and Xem-drawn envelopes\nCatalog version: 2026-10-20\n\nSizes: see table below\n- B16.11 socket-weld fittings take plain pipe in a socket: B is the socket bore (inside diameter of the socket), J the socket depth, D the bore of the fitting, C the socket wall, G the body wall and A the distance from the centre of the fitting to the bottom of the socket (centre-to-end = A + J). B, D and C are printed as two values, the first / second as headed in the table here (max / min as Wermac prints them). Wermac prints the letters in a different order on its coupling page; the tables here follow the elbow and tee pages, and the values are identical in all three.\n- Cross-check: for every elbow, tee and coupling size A + J (converted to inches) lands within 0.04 in of the maker's overall centre-to-end A as Smith-Cooper prints it (the catalog text does not define its letters). Its elbow column B (read as the body width) compares with the drawn B(min) + 2 × C(min) as -0.8 to -0.2 mm for Class 3000 and -3.0 to -1.7 mm for Class 6000 (drawn minus printed). The coupling gap E (Wermac's laying-length column 'E', 9.5 / 13 / 19 mm) is the distance between the two socket bottoms: 2J + E is within 1 mm of Smith-Cooper's coupling length for all nine sizes (NPS 1/2: 29.5 mm vs 1.14 in = 29.0; NPS 4: 57 mm vs 2.25 in = 57.2). The 'check' columns below show the inch comparisons.\n- Dropped as a misprint: Wermac prints D min = 46.4 for Class 3000 NPS 3 (next to D max 79.5); every other row has D min about 1.5–3 mm under D max, so the value is not used and no NPS 3 file is drawn. Tolerance of A as printed: ±1.5 mm (NPS 1/2 and 3/4), ±2 mm (NPS 1 to 2), ±2.5 mm (NPS 2-1/2 to 4).\n- Files (Xem-drawn envelopes): a sphere and cylinders of outside diameter B(min) + 2 × C(min) meeting at the fitting centre, out to A + J on each arm; socket bore B(min) for the last J; bore D(min) from the socket bottom to the centre. The second printed value of B, C and D is used (the guaranteed minimum body; NPS 1/2 Class 3000: Ø29.9 drawn, the maker prints 1.20 in = 30.5 mm; the Class 6000 body is drawn smaller than the maker's by the range in the cross-check above). The true outside contour of a forged elbow or tee is not published as numbers, so the body is a cylinder-and-sphere envelope; the socket, the depth, the bore and the centre-to-bottom are the published values. Couplings: tube of that OD, length 2J + E.\n- Half couplings, caps and reducing inserts are not tabulated here: the sources read give no defined centre dimension for them (Smith-Cooper A / B for socket-weld caps are printed without definitions).\n- Socket bore vs pipe OD: Schedule 40 pipe OD is 21.34 / 26.67 / 33.40 / 42.16 / 48.26 / 60.33 mm at NPS 1/2 to 2, against socket bores of 21.70–21.95 / 27.05–27.30 / 33.80–34.05 / 42.55–42.80 / 48.65–48.90 / 61.10–61.35, i.e. 0.36–1.0 mm of clearance.\n\nclass  NPS  socket bore B max / min  socket depth J  bore D max / min  socket wall C max / min  body wall G  A 90° (centre to socket bottom)  A 45°  check: (A90+J) in vs maker A in  check: (A45+J) in vs maker A in  coupling gap E  check: coupling length 2J+E vs maker\n3000  1/2  21.95 / 21.70  10  16.6 / 15  4.65 / 4.10  3.75  15.5  11.5  1.00 vs 1.00  0.85 vs 0.82  9.5  29.5 (1.16 in) vs 1.14 in\n3000  3/4  27.30 / 27.05  13  21.7 / 20.2  4.90 / 4.25  3.9  19.5  12.5  1.28 vs 1.25  1.00 vs 1.00  9.5  35.5 (1.40 in) vs 1.38 in\n3000  1  34.05 / 33.80  13  27.4 / 25.9  5.70 / 5.00  4.55  22  14  1.38 vs 1.38  1.06 vs 1.06  13  39 (1.54 in) vs 1.50 in\n3000  1-1/4  42.80 / 42.55  13  35.8 / 34.3  6.05 / 5.30  4.85  27  17  1.57 vs 1.56  1.18 vs 1.19  13  39 (1.54 in) vs 1.50 in\n3000  1-1/2  48.90 / 48.65  13  41.7 / 40.1  6.35 / 5.55  5.1  32  21  1.77 vs 1.75  1.34 vs 1.31  13  39 (1.54 in) vs 1.50 in\n3000  2  61.35 / 61.10  16  53.5 / 51.7  6.95 / 6.05  5.55  38  25  2.13 vs 2.12  1.61 vs 1.62  19  51 (2.01 in) vs 2.00 in\n3000  2-1/2  74.20 / 73.80  16  64.2 / 61.2  8.75 / 7.65  7.0  41.5  29  2.26 vs 2.24  1.77 vs 1.74  19  51 (2.01 in) vs 2.00 in\n3000  3  90.15 / 89.80  16  79.5 / n/a (misprint)  9.50 / 8.30  7.6  57.5  31.5  2.89 vs 2.87  1.87 vs 1.87  19  51 (2.01 in) vs 2.00 in\n3000  4  115.80 / 115.45  19  103.8 / 100.7  10.70 / 9.35  8.55  66.5  41.5  3.37 vs 3.37  2.38 vs 2.37  19  57 (2.24 in) vs 2.25 in\n6000  1/2  21.95 / 21.70  10  12.5 / 11  5.95 / 5.20  4.8  19.5  12.5  1.16 vs 1.13  0.89 vs 0.88  9.5  —\n6000  3/4  27.30 / 27.05  13  16.3 / 14.8  6.95 / 6.05  5.55  22.5  14.5  1.40 vs 1.38  1.08 vs 1.06  9.5  —\n6000  1  34.05 / 33.80  13  21.5 / 19.9  7.90 / 6.95  6.35  27  17  1.57 vs 1.56  1.18 vs 1.19  13  —\n6000  1-1/4  42.80 / 42.55  13  30.2 / 28.7  7.90 / 6.95  6.35  32  21  1.77 vs 1.75  1.34 vs 1.31  13  —\n6000  1-1/2  48.90 / 48.65  13  34.7 / 33.2  8.90 / 7.80  7.15  38  25  2.01 vs 2.00  1.50 vs 1.50  13  —\n6000  2  61.35 / 61.10  16  43.6 / 42.1  10.90 / 9.50  8.75  41  29  2.24 vs 2.24  1.77 vs 1.74  19  —\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- Wermac: ASME B16.11 socket-weld elbows 90 / 45 deg, Class 3000 and 6000 (mm) — web — Publisher's page; dimensions are facts — https://wermac.org/fittings/dim_sw_elbows.html\n- Wermac: ASME B16.11 socket-weld tees and crosses, Class 3000 and 6000 (mm) — web — Publisher's page; dimensions are facts — https://wermac.org/fittings/dim_sw_tee_cross.html\n- Wermac: ASME B16.11 socket-weld couplings, Class 3000 and 6000 (mm) — web — Publisher's page; dimensions are facts — https://wermac.org/fittings/dim_sw_coupling.html\n- Smith-Cooper (maker), via buyfittingsonline.com: Forged carbon steel fittings, Class 3000 / 6000, threaded (42-series) and socket weld (52-series): elbows, tees, couplings, caps; dimensions A and B in inches (letters not defined in the text read) — web — Maker catalog; numbers only — https://www.buyfittingsonline.com/content/pipe-fittings-forged-carbon-steel-specifications-sizing-3000-6000-lb.pdf\n- Bonney Forge (maker): Forged steel fittings CAD (socket weld 3000 and others; 3D models per part) — CAD — Maker's site terms: check before use [verify license at link] — https://cad.bonneyforge.com/printitem/forged-steel-fittings-unions/category-1108/3000-socket-weld-1\n- Bonney Forge (maker): Forged steel fittings catalog F9-2012 (socket weld and threaded elbows, tees, couplings, caps; ASME B16.11); read for its scope only, its tables were not used (the extract disagreed with the other two sources) — web — Maker catalog — https://bonneyforge.com/assets/files/FSFU.pdf\n- ANSI Webstore (standard body storefront): ASME B16.11-2016 Forged Fittings, Socket-Welding and Threaded (the standard itself is paywalled; listing only) — web — Storefront page — https://webstore.ansi.org/standards/asme/asmeb16112016\n\nFree files (CC BY 4.0, Xem Studio; STEP + STL, 14 parts): https://xemstudio.com/files/hardware/forged-socket-weld-fittings-b16-11/index.json\nAPI: https://xemstudio.com/api/geometry?object=forged-socket-weld-fittings-b16-11\n",
 "sources": [
  {
   "publisher": "Wermac",
   "title": "ASME B16.11 socket-weld elbows 90 / 45 deg, Class 3000 and 6000 (mm)",
   "url": "https://wermac.org/fittings/dim_sw_elbows.html",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Wermac",
   "title": "ASME B16.11 socket-weld tees and crosses, Class 3000 and 6000 (mm)",
   "url": "https://wermac.org/fittings/dim_sw_tee_cross.html",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Wermac",
   "title": "ASME B16.11 socket-weld couplings, Class 3000 and 6000 (mm)",
   "url": "https://wermac.org/fittings/dim_sw_coupling.html",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Smith-Cooper (maker), via buyfittingsonline.com",
   "title": "Forged carbon steel fittings, Class 3000 / 6000, threaded (42-series) and socket weld (52-series): elbows, tees, couplings, caps; dimensions A and B in inches (letters not defined in the text read)",
   "url": "https://www.buyfittingsonline.com/content/pipe-fittings-forged-carbon-steel-specifications-sizing-3000-6000-lb.pdf",
   "formats": [
    "web"
   ],
   "license": "Maker catalog; numbers only",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Bonney Forge (maker)",
   "title": "Forged steel fittings CAD (socket weld 3000 and others; 3D models per part)",
   "url": "https://cad.bonneyforge.com/printitem/forged-steel-fittings-unions/category-1108/3000-socket-weld-1",
   "formats": [
    "CAD"
   ],
   "license": "Maker's site terms: check before use",
   "license_verified": false,
   "hosted": false
  },
  {
   "publisher": "Bonney Forge (maker)",
   "title": "Forged steel fittings catalog F9-2012 (socket weld and threaded elbows, tees, couplings, caps; ASME B16.11); read for its scope only, its tables were not used (the extract disagreed with the other two sources)",
   "url": "https://bonneyforge.com/assets/files/FSFU.pdf",
   "formats": [
    "web"
   ],
   "license": "Maker catalog",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "ANSI Webstore (standard body storefront)",
   "title": "ASME B16.11-2016 Forged Fittings, Socket-Welding and Threaded (the standard itself is paywalled; listing only)",
   "url": "https://webstore.ansi.org/standards/asme/asmeb16112016",
   "formats": [
    "web"
   ],
   "license": "Storefront page",
   "license_verified": true,
   "hosted": false
  }
 ],
 "xem": {
  "status": "free-files",
  "sheet_free": true,
  "mesh_price_usd": null,
  "step_price_usd": null,
  "tolerance_mm": null
 },
 "related": [
  "forged-threaded-fittings-b16-11",
  "schedule-40-pipe",
  "butt-weld-elbows-long-radius",
  "butt-weld-equal-tees",
  "malleable-iron-fittings-class-150",
  "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": [
  {
   "feature": "socket bore B (min printed)",
   "exact": "Ø21.70 (1/2), Ø33.80 (1), Ø61.10 (2) mm; depth J 10 / 13 / 16",
   "mates": "Schedule 40 pipe OD Ø21.34 / Ø33.40 / Ø60.33 (schedule-40-pipe), pipe seated to the socket bottom",
   "fit": "socket",
   "files": "sw-"
  },
  {
   "feature": "flow bore D (min printed)",
   "exact": "Class 3000: Ø15.0 / Ø25.9 / Ø51.7; Class 6000: Ø11.0 / Ø19.9",
   "mates": "pipe ID (Sch 40: 15.8 / 26.6 / 52.5): the fitting bore is smaller than the pipe bore by design",
   "fit": "designed",
   "files": "sw-"
  }
 ],
 "fit_classes": {
  "press": "stays put: pin, tube, bearing or magnet held by interference. ISO 286 equivalent: H7/p6 (locational interference) or tighter.",
  "slide": "assembles by hand and is held by a grub, pinch or clamp: shaft in a hub, rod in a socket, spigot in a bore. ISO 286 equivalent: H7/g6 or H7/h6.",
  "run": "turns or slides in use: pin in a link, rod through a guide. ISO 286 equivalent: H8/f7 (close running).",
  "socket": "large sliding fit: syringe barrel, sleeve, bobbin in a bore. ISO 286 equivalent: H9/d9 (free running) or looser.",
  "clamp": "split part that closes on the mating part with screws: make it at size.",
  "designed": "a gap that is part of the design (piston fit option, displacer gap, air gap): do not change."
 },
 "faq": [
  {
   "q": "How deep is the socket on a 1/2 inch socket-weld fitting?",
   "a": "10 mm (3/8 in) for 1/2 inch; 13 mm for 3/4 to 1-1/2 inch; 16 mm for 2 to 3 inch; 19 mm for 4 inch (ASME B16.11 table, Wermac)."
  },
  {
   "q": "What is the socket bore of a 1 inch socket-weld fitting?",
   "a": "33.80 to 34.05 mm, to take 33.40 mm Schedule 40 pipe."
  },
  {
   "q": "What is the centre-to-bottom of a 1/2 inch Class 3000 socket-weld elbow?",
   "a": "15.5 mm for the 90° and 11.5 mm for the 45° (add the 10 mm socket depth for centre-to-end)."
  }
 ],
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   "note": "NPS 1/2 Class 6000 socket-weld full coupling envelope: sockets Ø21.70 × 10 deep, 9.5 between socket bottoms, bore Ø11.0, OD Ø32.10, length 29.5"
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