{
 "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": "butt-weld-elbows-long-radius",
 "name": "Butt-weld elbows, 90° and 45° long radius (ASME B16.9), NPS ½ to 12",
 "kind": "standard",
 "category": "Tri-clamp & pipe",
 "group": "Pipe, tube & threads",
 "year": null,
 "question": "What is the centre-to-end of a 90° and 45° long-radius butt-weld elbow (ASME B16.9)?",
 "tags": [
  "pipe",
  "pipe fitting",
  "butt weld",
  "elbow",
  "b16.9",
  "standard"
 ],
 "aliases": [
  "butt weld elbow dimensions",
  "long radius elbow center to end",
  "90 degree lr elbow dimensions",
  "45 degree elbow center to end",
  "b16.9 elbow",
  "weld elbow step",
  "weld elbow stl",
  "schedule 40 elbow"
 ],
 "overall_mm": {
  "length": null,
  "width": null,
  "height": null
 },
 "official_cad": false,
 "xem_status": "free-files",
 "les": false,
 "free_files": 6,
 "url": "https://xemstudio.com/objects/butt-weld-elbows-long-radius/",
 "sheet_txt": "https://xemstudio.com/objects/butt-weld-elbows-long-radius/sheet.txt",
 "sheet": {
  "basis": "ASME B16.9 dimensions as published in manufacturer tables (SHIELD, mm; Weldbend, inch); OD and Sch 40 wall per ASME B36.10",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "A long-radius (LR) elbow has a bend radius of 1.5 × NPS from NPS ¾ up (1½ in at NPS ½ and ¾). Centre-to-end is from the intersection of the two pipe axes to the weld end; for a 90° LR elbow it equals the bend radius.",
   "Values are the manufacturers' published B16.9 tables (the standard's own text is paywalled): mm from SHIELD, inch from Weldbend (90° all sizes, 45° to NPS 2).",
   "Files at NPS 1, 2 and 4, Schedule 40 hollow. The 45° elbow's bend radius is not tabulated separately: the files use the 90° LR radius and add a short straight at each end to reach the published 45° centre-to-end (tangent noted per file).",
   "OD and Schedule 40 wall: Weldbend prints OD rounded (1.32, 2.38 in); the files use the exact ASME B36.10 OD (1.315, 2.375, 4.500 in) with the Weldbend Sch 40 wall (.133, .154, .237 in). Fittings are made to match the pipe's OD and wall.",
   "Ends are drawn square. Real fittings are bevelled for welding to ASME B16.25; no public, citable statement of the bevel was found, so it is not drawn."
  ],
  "table": {
   "columns": [
    "NPS",
    "OD, mm",
    "Sch 40 wall",
    "90° LR centre-to-end A, mm",
    "45° LR centre-to-end B, mm"
   ],
   "rows": [
    [
     "1/2",
     "21.3 (0.84 in)",
     "0.109 in (2.77 mm)",
     "38 (1.50 in)",
     "16 (0.62 in)"
    ],
    [
     "3/4",
     "26.7 (1.05 in)",
     "0.113 in (2.87 mm)",
     "38 (1.50 in)",
     "19 (0.75 in)"
    ],
    [
     "1",
     "33.4 (1.32 in)",
     "0.133 in (3.38 mm)",
     "38 (1.50 in)",
     "22 (0.88 in)"
    ],
    [
     "1-1/4",
     "42.2 (1.66 in)",
     "0.140 in (3.56 mm)",
     "48 (1.88 in)",
     "25 (1.00 in)"
    ],
    [
     "1-1/2",
     "48.3 (1.90 in)",
     "0.145 in (3.68 mm)",
     "57 (2.25 in)",
     "29 (1.12 in)"
    ],
    [
     "2",
     "60.3 (2.38 in)",
     "0.154 in (3.91 mm)",
     "76 (3.00 in)",
     "35 (1.38 in)"
    ],
    [
     "2-1/2",
     "73.0 (2.88 in)",
     "0.203 in (5.16 mm)",
     "95 (3.75 in)",
     "44"
    ],
    [
     "3",
     "88.9 (3.50 in)",
     "0.216 in (5.49 mm)",
     "114 (4.50 in)",
     "51"
    ],
    [
     "3-1/2",
     "101.6 (4.00 in)",
     "0.226 in (5.74 mm)",
     "133 (5.25 in)",
     "57"
    ],
    [
     "4",
     "114.3 (4.50 in)",
     "0.237 in (6.02 mm)",
     "152 (6.00 in)",
     "64"
    ],
    [
     "5",
     "141.3 (5.56 in)",
     "0.258 in (6.55 mm)",
     "190 (7.50 in)",
     "79"
    ],
    [
     "6",
     "168.3 (6.62 in)",
     "0.280 in (7.11 mm)",
     "229 (9.00 in)",
     "95"
    ],
    [
     "8",
     "219.1 (8.62 in)",
     "0.322 in (8.18 mm)",
     "305 (12.00 in)",
     "127"
    ],
    [
     "10",
     "273.0 (10.75 in)",
     "0.365 in (9.27 mm)",
     "381 (15.00 in)",
     "159"
    ],
    [
     "12",
     "323.8 (12.75 in)",
     "0.406 in (10.31 mm)",
     "457 (18.00 in)",
     "190"
    ]
   ]
  }
 },
 "sheet_text": "Butt-weld elbows, 90° and 45° long radius (ASME B16.9), NPS ½ to 12 — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/butt-weld-elbows-long-radius/  (sheet CC BY 4.0)\nBasis: ASME B16.9 dimensions as published in manufacturer tables (SHIELD, mm; Weldbend, inch); OD and Sch 40 wall per ASME B36.10\nCatalog version: 2026-10-20\n\nSizes: see table below\n- A long-radius (LR) elbow has a bend radius of 1.5 × NPS from NPS ¾ up (1½ in at NPS ½ and ¾). Centre-to-end is from the intersection of the two pipe axes to the weld end; for a 90° LR elbow it equals the bend radius.\n- Values are the manufacturers' published B16.9 tables (the standard's own text is paywalled): mm from SHIELD, inch from Weldbend (90° all sizes, 45° to NPS 2).\n- Files at NPS 1, 2 and 4, Schedule 40 hollow. The 45° elbow's bend radius is not tabulated separately: the files use the 90° LR radius and add a short straight at each end to reach the published 45° centre-to-end (tangent noted per file).\n- OD and Schedule 40 wall: Weldbend prints OD rounded (1.32, 2.38 in); the files use the exact ASME B36.10 OD (1.315, 2.375, 4.500 in) with the Weldbend Sch 40 wall (.133, .154, .237 in). Fittings are made to match the pipe's OD and wall.\n- Ends are drawn square. Real fittings are bevelled for welding to ASME B16.25; no public, citable statement of the bevel was found, so it is not drawn.\n\nNPS  OD, mm  Sch 40 wall  90° LR centre-to-end A, mm  45° LR centre-to-end B, mm\n1/2  21.3 (0.84 in)  0.109 in (2.77 mm)  38 (1.50 in)  16 (0.62 in)\n3/4  26.7 (1.05 in)  0.113 in (2.87 mm)  38 (1.50 in)  19 (0.75 in)\n1  33.4 (1.32 in)  0.133 in (3.38 mm)  38 (1.50 in)  22 (0.88 in)\n1-1/4  42.2 (1.66 in)  0.140 in (3.56 mm)  48 (1.88 in)  25 (1.00 in)\n1-1/2  48.3 (1.90 in)  0.145 in (3.68 mm)  57 (2.25 in)  29 (1.12 in)\n2  60.3 (2.38 in)  0.154 in (3.91 mm)  76 (3.00 in)  35 (1.38 in)\n2-1/2  73.0 (2.88 in)  0.203 in (5.16 mm)  95 (3.75 in)  44\n3  88.9 (3.50 in)  0.216 in (5.49 mm)  114 (4.50 in)  51\n3-1/2  101.6 (4.00 in)  0.226 in (5.74 mm)  133 (5.25 in)  57\n4  114.3 (4.50 in)  0.237 in (6.02 mm)  152 (6.00 in)  64\n5  141.3 (5.56 in)  0.258 in (6.55 mm)  190 (7.50 in)  79\n6  168.3 (6.62 in)  0.280 in (7.11 mm)  229 (9.00 in)  95\n8  219.1 (8.62 in)  0.322 in (8.18 mm)  305 (12.00 in)  127\n10  273.0 (10.75 in)  0.365 in (9.27 mm)  381 (15.00 in)  159\n12  323.8 (12.75 in)  0.406 in (10.31 mm)  457 (18.00 in)  190\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- SHIELD (manufacturer): Butt-welded fittings & flanges, SG-BWFF: ASME B16.9 elbows, tees, reducers (mm) — web — Publisher's page; dimensions are facts — https://www.naffco.com/media-downloads/pdf/buttwelded.pdf\n- Weldbend Corporation: Weld fitting & weld flange catalog, 63rd edition: 90° and 45° long-radius elbows, OD, STD / Sch 40 wall — web — Publisher's page; dimensions are facts — https://acceldx.roccommercecloud.com/assets/86/84/86841a47-ae63-4c4d-9881-ceba74db0969/Weldbend_131010000_Catalog.pdf\n\nFree files (CC BY 4.0, Xem Studio; STEP + STL, 6 parts): https://xemstudio.com/files/hardware/butt-weld-elbows-long-radius/index.json\nAPI: https://xemstudio.com/api/geometry?object=butt-weld-elbows-long-radius\n",
 "sources": [
  {
   "publisher": "SHIELD (manufacturer)",
   "title": "Butt-welded fittings & flanges, SG-BWFF: ASME B16.9 elbows, tees, reducers (mm)",
   "url": "https://www.naffco.com/media-downloads/pdf/buttwelded.pdf",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Weldbend Corporation",
   "title": "Weld fitting & weld flange catalog, 63rd edition: 90° and 45° long-radius elbows, OD, STD / Sch 40 wall",
   "url": "https://acceldx.roccommercecloud.com/assets/86/84/86841a47-ae63-4c4d-9881-ceba74db0969/Weldbend_131010000_Catalog.pdf",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  }
 ],
 "xem": {
  "status": "free-files",
  "sheet_free": true,
  "mesh_price_usd": null,
  "step_price_usd": null,
  "tolerance_mm": null
 },
 "related": [
  "butt-weld-equal-tees",
  "butt-weld-reducers",
  "schedule-40-pipe",
  "sanitary-clamp-elbows"
 ],
 "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 is the centre-to-end of a 2 in 90° LR weld elbow?",
   "a": "3 in (76 mm); 45° LR: 35 mm (1.38 in)."
  },
  {
   "q": "What is the centre-to-end of a 4 in 90° LR weld elbow?",
   "a": "6 in (152 mm); 45° LR: 64 mm."
  }
 ],
 "files_license": null,
 "offers": [
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   "file": "bw-elbow-90-lr-nps1-sch40",
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   "license": "CC BY 4.0 (Xem Studio)",
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   "stl": "https://xemstudio.com/files/hardware/butt-weld-elbows-long-radius/bw-elbow-90-lr-nps1-sch40.stl",
   "note": "NPS 1 90° long-radius elbow, Sch 40: OD 33.40, ID 26.64, centre-to-end 1.50 in (38.1 mm); square ends"
  },
  {
   "file": "bw-elbow-45-lr-nps1-sch40",
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   "stl": "https://xemstudio.com/files/hardware/butt-weld-elbows-long-radius/bw-elbow-45-lr-nps1-sch40.stl",
   "note": "NPS 1 45° long-radius elbow, Sch 40: OD 33.40, ID 26.64, centre-to-end 22 mm; bend radius 38.1 mm with 6.22 mm straight at each end; square ends"
  },
  {
   "file": "bw-elbow-90-lr-nps2-sch40",
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   "stl": "https://xemstudio.com/files/hardware/butt-weld-elbows-long-radius/bw-elbow-90-lr-nps2-sch40.stl",
   "note": "NPS 2 90° long-radius elbow, Sch 40: OD 60.32, ID 52.50, centre-to-end 3.00 in (76.2 mm); square ends"
  },
  {
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   "stl": "https://xemstudio.com/files/hardware/butt-weld-elbows-long-radius/bw-elbow-45-lr-nps2-sch40.stl",
   "note": "NPS 2 45° long-radius elbow, Sch 40: OD 60.32, ID 52.50, centre-to-end 35 mm; bend radius 76.2 mm with 3.44 mm straight at each end; square ends"
  },
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   "file": "bw-elbow-90-lr-nps4-sch40",
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   "stl": "https://xemstudio.com/files/hardware/butt-weld-elbows-long-radius/bw-elbow-90-lr-nps4-sch40.stl",
   "note": "NPS 4 90° long-radius elbow, Sch 40: OD 114.30, ID 102.26, centre-to-end 6.00 in (152.4 mm); square ends"
  },
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   "stl": "https://xemstudio.com/files/hardware/butt-weld-elbows-long-radius/bw-elbow-45-lr-nps4-sch40.stl",
   "note": "NPS 4 45° long-radius elbow, Sch 40: OD 114.30, ID 102.26, centre-to-end 64 mm; bend radius 152.4 mm with 0.87 mm straight at each end; square ends"
  }
 ],
 "markdown": "https://xemstudio.com/objects/butt-weld-elbows-long-radius/index.md"
}