{
 "version": "2026-10-20",
 "license": "Dimension sheets are written by Xem Studio from the cited sources and are free to use (CC BY 4.0, attribute 'Xem Studio'). Linked files belong to their publishers under the license shown; Xem Studio does not host them. 'license_verified: false' means the license shown is from memory or the publisher's page as last read and should be confirmed at the link before commercial use.",
 "slug": "sanitary-clamp-reducers",
 "name": "Sanitary clamp reducers, concentric and eccentric, ½ to 4 in (tri-clamp style, BPE)",
 "kind": "standard",
 "category": "Hardware",
 "group": "Sanitary clamp fittings",
 "year": null,
 "question": "How long is a 2 × 1½ inch sanitary clamp reducer?",
 "tags": [
  "reducer",
  "concentric reducer",
  "eccentric reducer",
  "31mp",
  "32mp",
  "sanitary",
  "tri-clamp",
  "clamp fitting",
  "stainless fitting",
  "brewing",
  "ferrule"
 ],
 "aliases": [
  "tri clamp reducer dimensions",
  "sanitary reducer 2 x 1.5",
  "eccentric tri clamp reducer",
  "concentric reducer tri clamp",
  "tri clamp reducer stl"
 ],
 "overall_mm": {
  "length": null,
  "width": null,
  "height": null
 },
 "official_cad": false,
 "xem_status": "free-files",
 "les": false,
 "free_files": 26,
 "url": "https://xemstudio.com/objects/sanitary-clamp-reducers/",
 "sheet_txt": "https://xemstudio.com/objects/sanitary-clamp-reducers/sheet.txt",
 "sheet": {
  "basis": "ASME BPE / 3-A clamp-fitting dimensions published identically by two manufacturers; ISO 2852 face profile; drawn by Xem Studio from those numbers",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "Concentric (31-14MP) and eccentric (32-14MP) reducers with clamp faces both ends; 0.5 in of straight tube behind each face, then the cone. Eccentric reducers keep one side flat (drawn on −X): lay it flat side down so a line drains.",
   "Only the size pairs and lengths that both source catalogues list identically are drawn.",
   "Faces: ISO 2852 profile (2.85 mm rim, 1.6 mm gasket recess, 20° back cone) on the BPE flange diameters ½–¾ in 25.0, 1–1½ in 50.5, 2 in 64.0, 2½ in 77.5, 3 in 91.0, 4 in 119.0 mm; tube OD 12.7 / 19.05 / 25.4 / 38.1 / 50.8 / 63.5 / 76.2 / 101.6 mm, wall 1.65 mm (4 in: 2.11). The gasket-groove diameter on ½, ¾ and 4 in is derived (flange − 7.0 / 7.5 mm, the land width of every size ISO 2852 lists); the rest is from the standard."
  ],
  "table": {
   "columns": [
    "size_in",
    "face_to_face_mm",
    "large_tube_od_mm",
    "small_tube_od_mm"
   ],
   "rows": [
    [
     "¾ × ½",
     50.8,
     19.05,
     12.7
    ],
    [
     "1 × ¾",
     50.8,
     25.4,
     19.05
    ],
    [
     "1½ × 1",
     76.2,
     38.1,
     25.4
    ],
    [
     "2 × 1",
     127,
     50.8,
     25.4
    ],
    [
     "2 × 1½",
     76.2,
     50.8,
     38.1
    ],
    [
     "2½ × 1½",
     127,
     63.5,
     38.1
    ],
    [
     "2½ × 2",
     76.2,
     63.5,
     50.8
    ],
    [
     "3 × 1½",
     177.8,
     76.2,
     38.1
    ],
    [
     "3 × 2",
     127,
     76.2,
     50.8
    ],
    [
     "3 × 2½",
     76.2,
     76.2,
     63.5
    ],
    [
     "4 × 2",
     231.8,
     101.6,
     50.8
    ],
    [
     "4 × 2½",
     181,
     101.6,
     63.5
    ],
    [
     "4 × 3",
     130.2,
     101.6,
     76.2
    ]
   ]
  }
 },
 "sheet_text": "Sanitary clamp reducers, concentric and eccentric, ½ to 4 in (tri-clamp style, BPE) — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/sanitary-clamp-reducers/  (CC BY 4.0)\nBasis: ASME BPE / 3-A clamp-fitting dimensions published identically by two manufacturers; ISO 2852 face profile; drawn by Xem Studio from those numbers\nCatalog version: 2026-10-20\n\nSizes: see table below\n- Concentric (31-14MP) and eccentric (32-14MP) reducers with clamp faces both ends; 0.5 in of straight tube behind each face, then the cone. Eccentric reducers keep one side flat (drawn on −X): lay it flat side down so a line drains.\n- Only the size pairs and lengths that both source catalogues list identically are drawn.\n- Faces: ISO 2852 profile (2.85 mm rim, 1.6 mm gasket recess, 20° back cone) on the BPE flange diameters ½–¾ in 25.0, 1–1½ in 50.5, 2 in 64.0, 2½ in 77.5, 3 in 91.0, 4 in 119.0 mm; tube OD 12.7 / 19.05 / 25.4 / 38.1 / 50.8 / 63.5 / 76.2 / 101.6 mm, wall 1.65 mm (4 in: 2.11). The gasket-groove diameter on ½, ¾ and 4 in is derived (flange − 7.0 / 7.5 mm, the land width of every size ISO 2852 lists); the rest is from the standard.\n\nsize_in  face_to_face_mm  large_tube_od_mm  small_tube_od_mm\n¾ × ½  50.8  19.05  12.7\n1 × ¾  50.8  25.4  19.05\n1½ × 1  76.2  38.1  25.4\n2 × 1  127.0  50.8  25.4\n2 × 1½  76.2  50.8  38.1\n2½ × 1½  127.0  63.5  38.1\n2½ × 2  76.2  63.5  50.8\n3 × 1½  177.8  76.2  38.1\n3 × 2  127.0  76.2  50.8\n3 × 2½  76.2  76.2  63.5\n4 × 2  231.8  101.6  50.8\n4 × 2½  181.0  101.6  63.5\n4 × 3  130.2  101.6  76.2\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- ASME: BPE Bioprocessing Equipment (clamp fitting dimensions, tube OD and wall) — standard — ASME; dimensions are facts [verify license at link] — https://www.asme.org/codes-standards/find-codes-standards/bpe-bioprocessing-equipment\n- ISO (via iTeh sample): ISO 2852 clamp liners: face profile and flange / groove diameters — PDF — standard excerpt; dimensions are facts — https://cdn.standards.iteh.ai/samples/7850/eb49c396488d408c8ced3e2961d76cf3/ISO-2852-1974.pdf\n- Dixon Sanitary: Clamp elbows, ferrules: dimension sheet — PDF — publisher's catalogue; dimensions cited, nothing copied — https://dixonvalve.com/en/media/1397776\n- Steel & O'Brien: Sanitary products catalog 2024 (clamp fittings dimension tables) — PDF — publisher's catalogue; dimensions cited, nothing copied — https://www.steelobrien.com/wp-content/uploads/2024/03/Sanitary-2024-FINAL.pdf\n\nFree files (CC BY 4.0, Xem Studio; STEP + STL, 26 parts): https://xemstudio.com/files/hardware/sanitary-clamp-reducers/index.json\nAPI: https://xemstudio.com/api/geometry?object=sanitary-clamp-reducers\n",
 "sources": [
  {
   "publisher": "ASME",
   "title": "BPE Bioprocessing Equipment (clamp fitting dimensions, tube OD and wall)",
   "url": "https://www.asme.org/codes-standards/find-codes-standards/bpe-bioprocessing-equipment",
   "formats": [
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   "license": "ASME; dimensions are facts",
   "license_verified": false,
   "hosted": false
  },
  {
   "publisher": "ISO (via iTeh sample)",
   "title": "ISO 2852 clamp liners: face profile and flange / groove diameters",
   "url": "https://cdn.standards.iteh.ai/samples/7850/eb49c396488d408c8ced3e2961d76cf3/ISO-2852-1974.pdf",
   "formats": [
    "PDF"
   ],
   "license": "standard excerpt; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Dixon Sanitary",
   "title": "Clamp elbows, ferrules: dimension sheet",
   "url": "https://dixonvalve.com/en/media/1397776",
   "formats": [
    "PDF"
   ],
   "license": "publisher's catalogue; dimensions cited, nothing copied",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Steel & O'Brien",
   "title": "Sanitary products catalog 2024 (clamp fittings dimension tables)",
   "url": "https://www.steelobrien.com/wp-content/uploads/2024/03/Sanitary-2024-FINAL.pdf",
   "formats": [
    "PDF"
   ],
   "license": "publisher's catalogue; dimensions cited, nothing copied",
   "license_verified": true,
   "hosted": false
  }
 ],
 "xem": {
  "status": "free-files",
  "sheet_free": true,
  "mesh_price_usd": null,
  "step_price_usd": null,
  "tolerance_mm": null
 },
 "related": [
  "sanitary-clamp-elbows",
  "sanitary-clamp-tees-crosses",
  "sanitary-clamp-caps-ferrules-spools",
  "tri-clamp-clamps"
 ],
 "fits": [
  {
   "role": "Connects to",
   "items": [
    {
     "slug": "tri-clamp-clamps",
     "why": "clamps for both sizes"
    },
    {
     "slug": "sanitary-clamp-caps-ferrules-spools",
     "why": "gaskets and spools for both sizes"
    }
   ]
  },
  {
   "role": "Alternatives",
   "items": [
    {
     "slug": "sanitary-clamp-tees-crosses",
     "why": "reduce at a branch instead"
    }
   ]
  }
 ],
 "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": [
  {
   "feature": "clamp faces",
   "exact": "ISO 2852 / BPE flange",
   "mates": "clamp + Type B gasket, large and small size",
   "fit": "clamp",
   "files": "all"
  }
 ],
 "fit_classes": {
  "press": "stays put: pin, tube, bearing or magnet held by interference. Typical FDM: hole +0.0 to +0.1 mm on diameter.",
  "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. Typical FDM: +0.2 mm.",
  "run": "turns or slides in use: pin in a link, rod through a guide. Typical FDM: +0.3 mm.",
  "socket": "large sliding fit: syringe barrel, sleeve, bobbin in a bore. Typical FDM: +0.3 mm.",
  "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 long is a 2 × 1½ in sanitary clamp reducer?",
   "a": "3.0 in (76.2 mm) face to face, concentric or eccentric."
  },
  {
   "q": "Concentric or eccentric?",
   "a": "Concentric keeps the centreline; eccentric keeps one side flat so a horizontal line drains or vents without a pocket."
  }
 ],
 "files_license": null,
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