{
 "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-short-radius",
 "name": "Butt-weld short-radius 90° elbows (ASME B16.9 / B16.28), NPS 1 to 12: centre-to-end = 1 × NPS",
 "kind": "standard",
 "category": "Tri-clamp & pipe",
 "group": "Pipe, tube & threads",
 "year": null,
 "question": "What is the centre-to-end of a short-radius (SR) 90° butt-weld elbow, and how does it differ from long radius?",
 "tags": [
  "pipe",
  "pipe fitting",
  "butt weld",
  "elbow",
  "short radius",
  "b16.9",
  "b16.28",
  "standard"
 ],
 "aliases": [
  "short radius elbow dimensions",
  "sr elbow center to end",
  "90 degree short radius elbow",
  "butt weld short radius elbow",
  "b16.28 elbow",
  "1d elbow dimensions",
  "sr 90 elbow step file",
  "short radius elbow vs long radius",
  "weld elbow 1d radius",
  "short radius elbow cad",
  "2 inch sr elbow dimensions",
  "sch 40 short radius elbow"
 ],
 "overall_mm": {
  "length": null,
  "width": null,
  "height": null
 },
 "official_cad": false,
 "xem_status": "free-files",
 "les": false,
 "free_files": 3,
 "url": "https://xemstudio.com/objects/butt-weld-elbows-short-radius/",
 "sheet_txt": "https://xemstudio.com/objects/butt-weld-elbows-short-radius/sheet.txt",
 "sheet": {
  "basis": "Centre-to-end A (mm) from Wermac's ASME B16.9 short-radius table, cross-checked with Texas Flange's inch table; OD and Schedule 40 wall per ASME B36.10 (Texas Flange)",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "A short-radius (SR) elbow turns on a bend radius of 1 × NPS, so centre-to-end A equals the nominal size in inches (NPS 2 = 2.00 in = 51 mm). A long-radius (LR) elbow turns on 1.5 × NPS (see butt-weld-elbows-long-radius) and a 3D elbow on 3 × NPS (butt-weld-elbows-3d). Short radius starts at NPS 1 in the tables read; there is no NPS 1/2 or 3/4 short-radius row.",
   "Both sources agree: the inch value (Texas Flange) times 25.4 matches Wermac's mm value within rounding for every size (for example NPS 4: 4.00 in = 101.6 mm, printed 102 mm). The mm column is the standard's rounded metric figure; the inch column is the exact bend radius. Texas Flange notes that OD and A are the same for every schedule: only the wall changes.",
   "Wermac prints the manufacturing tolerance on A as ±2 mm for NPS 1/2 to 24 and on OD at the bevel as +1.6 / −0.8 mm for NPS 1/2 to 2-1/2, ±1.6 mm for NPS 3 to 4, +2.4 / −1.6 mm for NPS 5 to 8 and +4 / −3.2 mm for NPS 10 to 18. Wall: not less than 87.5% of the nominal wall.",
   "Files at NPS 1, 2 and 4, Schedule 40, hollow: a torus section of the pipe's OD and wall, bend radius equal to the published centre-to-end (inch value × 25.4), so the end faces sit exactly A from the intersection of the two pipe axes. This is the full shape: a circular bend is defined by A, OD and wall.",
   "OD and Schedule 40 wall: the tables print OD rounded (1.32, 2.38, 4.50 in); the files use the exact ASME B36.10 OD (1.315, 2.375, 4.500 in) with the Sch 40 wall (.133, .154, .237 in) that Texas Flange prints for each size. 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.",
   "Heavier schedules change only the wall: use the OD from the table and a wall from the pipe schedule (Sch 80 NPS 2 is 0.218 in, Sch 80 NPS 4 0.337 in)."
  ],
  "table": {
   "columns": [
    "NPS",
    "OD, mm",
    "centre-to-end A, mm (Wermac)",
    "centre-to-end A, in (Texas Flange)",
    "Sch 40 wall"
   ],
   "rows": [
    [
     "1",
     "33.4 (1.32 in)",
     "25",
     "1.00",
     "0.133 in (3.38 mm)"
    ],
    [
     "1-1/4",
     "42.2 (1.66 in)",
     "32",
     "1.25",
     "0.140 in (3.56 mm)"
    ],
    [
     "1-1/2",
     "48.3 (1.90 in)",
     "38",
     "1.50",
     "0.145 in (3.68 mm)"
    ],
    [
     "2",
     "60.3 (2.38 in)",
     "51",
     "2.00",
     "0.154 in (3.91 mm)"
    ],
    [
     "2-1/2",
     "73.0 (2.88 in)",
     "64",
     "2.50",
     "0.203 in (5.16 mm)"
    ],
    [
     "3",
     "88.9 (3.50 in)",
     "76",
     "3.00",
     "0.216 in (5.49 mm)"
    ],
    [
     "3-1/2",
     "101.6 (4.00 in)",
     "89",
     "3.50",
     "0.226 in (5.74 mm)"
    ],
    [
     "4",
     "114.3 (4.50 in)",
     "102",
     "4.00",
     "0.237 in (6.02 mm)"
    ],
    [
     "5",
     "141.3 (5.56 in)",
     "127",
     "5.00",
     "0.258 in (6.55 mm)"
    ],
    [
     "6",
     "168.3 (6.62 in)",
     "152",
     "6.00",
     "0.280 in (7.11 mm)"
    ],
    [
     "8",
     "219.1 (8.62 in)",
     "203",
     "8.00",
     "0.322 in (8.18 mm)"
    ],
    [
     "10",
     "273.0 (10.75 in)",
     "254",
     "10.00",
     "0.365 in (9.27 mm)"
    ],
    [
     "12",
     "323.8 (12.75 in)",
     "305",
     "12.00",
     "0.406 in (10.31 mm)"
    ]
   ]
  }
 },
 "sheet_text": "Butt-weld short-radius 90° elbows (ASME B16.9 / B16.28), NPS 1 to 12: centre-to-end = 1 × NPS — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/butt-weld-elbows-short-radius/  (sheet CC BY 4.0)\nBasis: Centre-to-end A (mm) from Wermac's ASME B16.9 short-radius table, cross-checked with Texas Flange's inch table; OD and Schedule 40 wall per ASME B36.10 (Texas Flange)\nCatalog version: 2026-10-20\n\nSizes: see table below\n- A short-radius (SR) elbow turns on a bend radius of 1 × NPS, so centre-to-end A equals the nominal size in inches (NPS 2 = 2.00 in = 51 mm). A long-radius (LR) elbow turns on 1.5 × NPS (see butt-weld-elbows-long-radius) and a 3D elbow on 3 × NPS (butt-weld-elbows-3d). Short radius starts at NPS 1 in the tables read; there is no NPS 1/2 or 3/4 short-radius row.\n- Both sources agree: the inch value (Texas Flange) times 25.4 matches Wermac's mm value within rounding for every size (for example NPS 4: 4.00 in = 101.6 mm, printed 102 mm). The mm column is the standard's rounded metric figure; the inch column is the exact bend radius. Texas Flange notes that OD and A are the same for every schedule: only the wall changes.\n- Wermac prints the manufacturing tolerance on A as ±2 mm for NPS 1/2 to 24 and on OD at the bevel as +1.6 / −0.8 mm for NPS 1/2 to 2-1/2, ±1.6 mm for NPS 3 to 4, +2.4 / −1.6 mm for NPS 5 to 8 and +4 / −3.2 mm for NPS 10 to 18. Wall: not less than 87.5% of the nominal wall.\n- Files at NPS 1, 2 and 4, Schedule 40, hollow: a torus section of the pipe's OD and wall, bend radius equal to the published centre-to-end (inch value × 25.4), so the end faces sit exactly A from the intersection of the two pipe axes. This is the full shape: a circular bend is defined by A, OD and wall.\n- OD and Schedule 40 wall: the tables print OD rounded (1.32, 2.38, 4.50 in); the files use the exact ASME B36.10 OD (1.315, 2.375, 4.500 in) with the Sch 40 wall (.133, .154, .237 in) that Texas Flange prints for each size. 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- Heavier schedules change only the wall: use the OD from the table and a wall from the pipe schedule (Sch 80 NPS 2 is 0.218 in, Sch 80 NPS 4 0.337 in).\n\nNPS  OD, mm  centre-to-end A, mm (Wermac)  centre-to-end A, in (Texas Flange)  Sch 40 wall\n1  33.4 (1.32 in)  25  1.00  0.133 in (3.38 mm)\n1-1/4  42.2 (1.66 in)  32  1.25  0.140 in (3.56 mm)\n1-1/2  48.3 (1.90 in)  38  1.50  0.145 in (3.68 mm)\n2  60.3 (2.38 in)  51  2.00  0.154 in (3.91 mm)\n2-1/2  73.0 (2.88 in)  64  2.50  0.203 in (5.16 mm)\n3  88.9 (3.50 in)  76  3.00  0.216 in (5.49 mm)\n3-1/2  101.6 (4.00 in)  89  3.50  0.226 in (5.74 mm)\n4  114.3 (4.50 in)  102  4.00  0.237 in (6.02 mm)\n5  141.3 (5.56 in)  127  5.00  0.258 in (6.55 mm)\n6  168.3 (6.62 in)  152  6.00  0.280 in (7.11 mm)\n8  219.1 (8.62 in)  203  8.00  0.322 in (8.18 mm)\n10  273.0 (10.75 in)  254  10.00  0.365 in (9.27 mm)\n12  323.8 (12.75 in)  305  12.00  0.406 in (10.31 mm)\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- Wermac: ASME B16.9 90 deg short-radius elbow dimensions and tolerances (mm) — web — Publisher's page; dimensions are facts — https://www.wermac.org/fittings/dim_elbows_b.html\n- Texas Flange (manufacturer / distributor): Butt-weld 90 deg short-radius elbows (ASME B16.28): OD and centre-to-end by NPS, all schedules — web — Publisher's page; dimensions are facts — https://texasflange.com/butt-weld-fittings/elbow-short-radius/\n- McMaster-Carr: Metal pipe fittings (butt-weld elbows, tees, reducers, caps) (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/products/metal-pipe-fittings/\n\nFree files (CC BY 4.0, Xem Studio; STEP + STL, 3 parts): https://xemstudio.com/files/hardware/butt-weld-elbows-short-radius/index.json\nAPI: https://xemstudio.com/api/geometry?object=butt-weld-elbows-short-radius\n",
 "sources": [
  {
   "publisher": "Wermac",
   "title": "ASME B16.9 90 deg short-radius elbow dimensions and tolerances (mm)",
   "url": "https://www.wermac.org/fittings/dim_elbows_b.html",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Texas Flange (manufacturer / distributor)",
   "title": "Butt-weld 90 deg short-radius elbows (ASME B16.28): OD and centre-to-end by NPS, all schedules",
   "url": "https://texasflange.com/butt-weld-fittings/elbow-short-radius/",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "McMaster-Carr",
   "title": "Metal pipe fittings (butt-weld elbows, tees, reducers, caps) (free STEP/IGES per part, for your own design use; no redistribution)",
   "url": "https://www.mcmaster.com/products/metal-pipe-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": [
  "butt-weld-elbows-long-radius",
  "butt-weld-elbows-3d",
  "butt-weld-return-bends-180",
  "butt-weld-equal-tees",
  "butt-weld-reducers",
  "schedule-40-pipe",
  "asme-b16-5-class-150-flanges"
 ],
 "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": "weld ends",
   "exact": "OD = pipe OD (Ø33.40 / Ø60.33 / Ø114.30 at NPS 1 / 2 / 4), wall = Sch 40 (3.38 / 3.91 / 6.02)",
   "mates": "Schedule 40 pipe of the same NPS, butt-welded (schedule-40-pipe)",
   "fit": "designed",
   "files": "bw-elbow-90-sr"
  },
  {
   "feature": "centre-to-end A",
   "exact": "25.4 / 50.8 / 101.6 (= 1 × NPS in)",
   "mates": "pipe run set-back: face-to-axis distance of the next fitting or flange",
   "fit": "designed",
   "files": "bw-elbow-90-sr"
  }
 ],
 "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": "What is the centre-to-end of a 2 inch short-radius elbow?",
   "a": "51 mm (2.00 in): short-radius centre-to-end equals the nominal pipe size in inches."
  },
  {
   "q": "What is the difference between a short-radius and a long-radius elbow?",
   "a": "Bend radius: 1 × NPS for short radius (A = 2.00 in at NPS 2), 1.5 × NPS for long radius (A = 3.00 in at NPS 2)."
  },
  {
   "q": "Is the short-radius elbow the same for Schedule 40 and 80?",
   "a": "Yes: OD and centre-to-end are the same, only the wall thickness differs (Texas Flange prints one table for all schedules)."
  }
 ],
 "files_license": null,
 "offers": [
  {
   "file": "bw-elbow-90-sr-nps1-sch40",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/butt-weld-elbows-short-radius/bw-elbow-90-sr-nps1-sch40.step",
   "stl": "https://xemstudio.com/files/hardware/butt-weld-elbows-short-radius/bw-elbow-90-sr-nps1-sch40.stl",
   "note": "NPS 1 Sch 40 short-radius 90° elbow: OD 33.40 × 3.38 wall, bend radius = centre-to-end 25.4 mm; ends square"
  },
  {
   "file": "bw-elbow-90-sr-nps2-sch40",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/butt-weld-elbows-short-radius/bw-elbow-90-sr-nps2-sch40.step",
   "stl": "https://xemstudio.com/files/hardware/butt-weld-elbows-short-radius/bw-elbow-90-sr-nps2-sch40.stl",
   "note": "NPS 2 Sch 40 short-radius 90° elbow: OD 60.32 × 3.91 wall, bend radius = centre-to-end 50.8 mm; ends square"
  },
  {
   "file": "bw-elbow-90-sr-nps4-sch40",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/butt-weld-elbows-short-radius/bw-elbow-90-sr-nps4-sch40.step",
   "stl": "https://xemstudio.com/files/hardware/butt-weld-elbows-short-radius/bw-elbow-90-sr-nps4-sch40.stl",
   "note": "NPS 4 Sch 40 short-radius 90° elbow: OD 114.30 × 6.02 wall, bend radius = centre-to-end 101.6 mm; ends square"
  }
 ],
 "markdown": "https://xemstudio.com/objects/butt-weld-elbows-short-radius/index.md"
}