{
 "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": "tri-clamp-sight-glasses",
 "name": "Tri-clamp in-line sight glasses: 1½ to 4 in, 2, 4 and 6 in glass",
 "kind": "hardware",
 "category": "Hardware",
 "group": "Sanitary clamp fittings",
 "year": null,
 "question": "How is a tri-clamp sight glass built?",
 "tags": [
  "sight glass",
  "window",
  "inline sight glass",
  "sanitary",
  "tri-clamp",
  "clamp fitting",
  "brewing",
  "homebrew"
 ],
 "aliases": [
  "tri clamp sight glass",
  "1.5 tri clamp sight glass",
  "inline sight glass sanitary",
  "sight glass spool"
 ],
 "overall_mm": {
  "length": null,
  "width": null,
  "height": null
 },
 "official_cad": false,
 "xem_status": "free-files",
 "les": false,
 "free_files": 20,
 "url": "https://xemstudio.com/objects/tri-clamp-sight-glasses/",
 "sheet_txt": "https://xemstudio.com/objects/tri-clamp-sight-glasses/sheet.txt",
 "sheet": {
  "basis": "Xem Studio design: two clamp-face end pieces hold a glass tube (bore = the line bore) in counterbores on flat gaskets, pulled together by four M5 tie rods",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "A full-bore window in a line or on a vessel outlet: see the wort run off, the level or the colour. Glass tube: bore = the line bore, wall 3 (1½ and 2 in) or 4 (3 and 4 in). Face to face = two end pieces less the seats plus the glass.",
   "Every clamp face is the ISO 2852 profile used across this site: 2.85 mm rim, flat face with the gasket groove (K 1.6 deep, R3 1.2 bottom, 23° walls, P2 0.8 edges) on C2, 20° back cone. Flange C3 / groove C2 / tube OD × wall, mm: ½–¾ in 25.0 / 20.4 (derived) / 12.7–19.05 × 1.65; 1–1½ in 50.5 / 43.5 / 25.4–38.1 × 1.65; 2 in 64.0 / 56.5 / 50.8 × 1.65; 2½ in 77.5 / 70.5 / 63.5 × 1.65; 3 in 91.0 / 83.5 / 76.2 × 1.65; 4 in 119.0 / 110.0 / 101.6 × 2.11; 6 in 166.9 (6.570 in) / 156.5 / 152.4 × 2.77; 8 in 217.7 (8.570 in) / 207.0 / 203.2 × 2.77; 10 in 268.5 / 261.0 / 254.0 × 3.40; 12 in 319.3 / 311.8 / 304.8 × 3.40."
  ],
  "table": {
   "columns": [
    "size_in",
    "glass_in",
    "glass_od_mm",
    "glass_id_mm",
    "face_to_face_mm",
    "tie_rods"
   ],
   "rows": [
    [
     "1.5",
     2,
     40.8,
     34.8,
     98.8,
     "4 × M5 × 111"
    ],
    [
     "1.5",
     4,
     40.8,
     34.8,
     149.6,
     "4 × M5 × 162"
    ],
    [
     "1.5",
     6,
     40.8,
     34.8,
     200.4,
     "4 × M5 × 212"
    ],
    [
     "2",
     2,
     53.5,
     47.5,
     98.8,
     "4 × M5 × 111"
    ],
    [
     "2",
     4,
     53.5,
     47.5,
     149.6,
     "4 × M5 × 162"
    ],
    [
     "2",
     6,
     53.5,
     47.5,
     200.4,
     "4 × M5 × 212"
    ],
    [
     "3",
     2,
     80.9,
     72.9,
     98.8,
     "4 × M5 × 111"
    ],
    [
     "3",
     4,
     80.9,
     72.9,
     149.6,
     "4 × M5 × 162"
    ],
    [
     "3",
     6,
     80.9,
     72.9,
     200.4,
     "4 × M5 × 212"
    ],
    [
     "4",
     2,
     105.4,
     97.4,
     98.8,
     "4 × M5 × 111"
    ],
    [
     "4",
     4,
     105.4,
     97.4,
     149.6,
     "4 × M5 × 162"
    ],
    [
     "4",
     6,
     105.4,
     97.4,
     200.4,
     "4 × M5 × 212"
    ]
   ]
  }
 },
 "sheet_text": "Tri-clamp in-line sight glasses: 1½ to 4 in, 2, 4 and 6 in glass — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/tri-clamp-sight-glasses/  (CC BY 4.0)\nBasis: Xem Studio design: two clamp-face end pieces hold a glass tube (bore = the line bore) in counterbores on flat gaskets, pulled together by four M5 tie rods\nCatalog version: 2026-10-20\n\nSizes: see table below\n- A full-bore window in a line or on a vessel outlet: see the wort run off, the level or the colour. Glass tube: bore = the line bore, wall 3 (1½ and 2 in) or 4 (3 and 4 in). Face to face = two end pieces less the seats plus the glass.\n- Every clamp face is the ISO 2852 profile used across this site: 2.85 mm rim, flat face with the gasket groove (K 1.6 deep, R3 1.2 bottom, 23° walls, P2 0.8 edges) on C2, 20° back cone. Flange C3 / groove C2 / tube OD × wall, mm: ½–¾ in 25.0 / 20.4 (derived) / 12.7–19.05 × 1.65; 1–1½ in 50.5 / 43.5 / 25.4–38.1 × 1.65; 2 in 64.0 / 56.5 / 50.8 × 1.65; 2½ in 77.5 / 70.5 / 63.5 × 1.65; 3 in 91.0 / 83.5 / 76.2 × 1.65; 4 in 119.0 / 110.0 / 101.6 × 2.11; 6 in 166.9 (6.570 in) / 156.5 / 152.4 × 2.77; 8 in 217.7 (8.570 in) / 207.0 / 203.2 × 2.77; 10 in 268.5 / 261.0 / 254.0 × 3.40; 12 in 319.3 / 311.8 / 304.8 × 3.40.\n\nsize_in  glass_in  glass_od_mm  glass_id_mm  face_to_face_mm  tie_rods\n1.5  2  40.8  34.8  98.8  4 × M5 × 111\n1.5  4  40.8  34.8  149.6  4 × M5 × 162\n1.5  6  40.8  34.8  200.4  4 × M5 × 212\n2  2  53.5  47.5  98.8  4 × M5 × 111\n2  4  53.5  47.5  149.6  4 × M5 × 162\n2  6  53.5  47.5  200.4  4 × M5 × 212\n3  2  80.9  72.9  98.8  4 × M5 × 111\n3  4  80.9  72.9  149.6  4 × M5 × 162\n3  6  80.9  72.9  200.4  4 × M5 × 212\n4  2  105.4  97.4  98.8  4 × M5 × 111\n4  4  105.4  97.4  149.6  4 × M5 × 162\n4  6  105.4  97.4  200.4  4 × M5 × 212\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- GW Kent: Tri-clamp fittings guide: tube OD, flange OD and ID per size to 12 in; solid cap thickness — web — publisher's guide; dimensions cited — https://www.gwkent.com/triclamp-guide\n- Rubber Fab: Tri-Clamp gasket dimensional chart: gasket ID, OD and bead diameter per size (2 in bead 2.22 in / 56.50 mm, 1.5 in 1.71 / 43.50, 3 in 3.29 / 83.50) — PDF — maker chart; dimensions are facts [verify license at link] — https://shop.andersonprocess.com/media/assets/product/documents/rubber-fab-tri-clamp-dimensions.pdf\n\nFree files (CC BY 4.0, Xem Studio; STEP + STL, 20 parts): https://xemstudio.com/files/hardware/tri-clamp-sight-glasses/index.json\nAPI: https://xemstudio.com/api/geometry?object=tri-clamp-sight-glasses\n",
 "sources": [
  {
   "publisher": "GW Kent",
   "title": "Tri-clamp fittings guide: tube OD, flange OD and ID per size to 12 in; solid cap thickness",
   "url": "https://www.gwkent.com/triclamp-guide",
   "formats": [
    "web"
   ],
   "license": "publisher's guide; dimensions cited",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Rubber Fab",
   "title": "Tri-Clamp gasket dimensional chart: gasket ID, OD and bead diameter per size (2 in bead 2.22 in / 56.50 mm, 1.5 in 1.71 / 43.50, 3 in 3.29 / 83.50)",
   "url": "https://shop.andersonprocess.com/media/assets/product/documents/rubber-fab-tri-clamp-dimensions.pdf",
   "formats": [
    "PDF"
   ],
   "license": "maker chart; dimensions are facts",
   "license_verified": false,
   "hosted": false
  }
 ],
 "xem": {
  "status": "free-files",
  "sheet_free": true,
  "mesh_price_usd": null,
  "step_price_usd": null,
  "tolerance_mm": null
 },
 "related": [
  "tri-clamp-ported-end-caps",
  "tri-clamp-hose-barb-adapters"
 ],
 "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 holds the glass?",
   "a": "Each end piece's counterbore with a flat gasket; four M5 rods squeeze the two ends onto the glass."
  }
 ],
 "files_license": null,
 "offers": [
  {
   "file": "sight-glass-end-1.5in",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/tri-clamp-sight-glasses/sight-glass-end-1.5in.step",
   "stl": "https://xemstudio.com/files/hardware/tri-clamp-sight-glasses/sight-glass-end-1.5in.stl",
   "note": "1.5 in sight-glass end piece (two per sight glass): clamp face, Ø64.8 body 30.0 long, glass seat Ø40.8 × 6.0, four Ø5.5 tie-rod holes on r 26.4"
  },
  {
   "file": "sight-glass-tube-1.5in-2in",
   "formats": [
    "step",
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   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/tri-clamp-sight-glasses/sight-glass-tube-1.5in-2in.step",
   "stl": "https://xemstudio.com/files/hardware/tri-clamp-sight-glasses/sight-glass-tube-1.5in-2in.stl",
   "note": "1.5 in glass tube Ø40.8 × Ø34.8 × 50.8: sight glass 98.8 face to face with two end pieces"
  },
  {
   "file": "sight-glass-tube-1.5in-4in",
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    "step",
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   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/tri-clamp-sight-glasses/sight-glass-tube-1.5in-4in.step",
   "stl": "https://xemstudio.com/files/hardware/tri-clamp-sight-glasses/sight-glass-tube-1.5in-4in.stl",
   "note": "1.5 in glass tube Ø40.8 × Ø34.8 × 101.6: sight glass 149.6 face to face with two end pieces"
  },
  {
   "file": "sight-glass-tube-1.5in-6in",
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   "stl": "https://xemstudio.com/files/hardware/tri-clamp-sight-glasses/sight-glass-tube-1.5in-6in.stl",
   "note": "1.5 in glass tube Ø40.8 × Ø34.8 × 152.4: sight glass 200.4 face to face with two end pieces"
  },
  {
   "file": "sight-glass-seat-gasket-1.5in",
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   "stl": "https://xemstudio.com/files/hardware/tri-clamp-sight-glasses/sight-glass-seat-gasket-1.5in.stl",
   "note": "1.5 in flat seat gasket Ø40.8 × Ø34.8 × 1.5, one in each end seat"
  },
  {
   "file": "sight-glass-end-2in",
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    "step",
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   "stl": "https://xemstudio.com/files/hardware/tri-clamp-sight-glasses/sight-glass-end-2in.stl",
   "note": "2 in sight-glass end piece (two per sight glass): clamp face, Ø77.5 body 30.0 long, glass seat Ø53.5 × 6.0, four Ø5.5 tie-rod holes on r 32.8"
  },
  {
   "file": "sight-glass-tube-2in-2in",
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    "step",
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   "stl": "https://xemstudio.com/files/hardware/tri-clamp-sight-glasses/sight-glass-tube-2in-2in.stl",
   "note": "2 in glass tube Ø53.5 × Ø47.5 × 50.8: sight glass 98.8 face to face with two end pieces"
  },
  {
   "file": "sight-glass-tube-2in-4in",
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    "step",
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   "stl": "https://xemstudio.com/files/hardware/tri-clamp-sight-glasses/sight-glass-tube-2in-4in.stl",
   "note": "2 in glass tube Ø53.5 × Ø47.5 × 101.6: sight glass 149.6 face to face with two end pieces"
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  {
   "file": "sight-glass-tube-2in-6in",
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    "step",
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   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/tri-clamp-sight-glasses/sight-glass-tube-2in-6in.step",
   "stl": "https://xemstudio.com/files/hardware/tri-clamp-sight-glasses/sight-glass-tube-2in-6in.stl",
   "note": "2 in glass tube Ø53.5 × Ø47.5 × 152.4: sight glass 200.4 face to face with two end pieces"
  },
  {
   "file": "sight-glass-seat-gasket-2in",
   "formats": [
    "step",
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   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/tri-clamp-sight-glasses/sight-glass-seat-gasket-2in.step",
   "stl": "https://xemstudio.com/files/hardware/tri-clamp-sight-glasses/sight-glass-seat-gasket-2in.stl",
   "note": "2 in flat seat gasket Ø53.5 × Ø47.5 × 1.5, one in each end seat"
  },
  {
   "file": "sight-glass-end-3in",
   "formats": [
    "step",
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   "stl": "https://xemstudio.com/files/hardware/tri-clamp-sight-glasses/sight-glass-end-3in.stl",
   "note": "3 in sight-glass end piece (two per sight glass): clamp face, Ø104.9 body 30.0 long, glass seat Ø80.9 × 6.0, four Ø5.5 tie-rod holes on r 46.5"
  },
  {
   "file": "sight-glass-tube-3in-2in",
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   "stl": "https://xemstudio.com/files/hardware/tri-clamp-sight-glasses/sight-glass-tube-3in-2in.stl",
   "note": "3 in glass tube Ø80.9 × Ø72.9 × 50.8: sight glass 98.8 face to face with two end pieces"
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  {
   "file": "sight-glass-tube-3in-4in",
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    "step",
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   "license": "CC BY 4.0 (Xem Studio)",
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   "stl": "https://xemstudio.com/files/hardware/tri-clamp-sight-glasses/sight-glass-tube-3in-4in.stl",
   "note": "3 in glass tube Ø80.9 × Ø72.9 × 101.6: sight glass 149.6 face to face with two end pieces"
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   "file": "sight-glass-tube-3in-6in",
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   "stl": "https://xemstudio.com/files/hardware/tri-clamp-sight-glasses/sight-glass-tube-3in-6in.stl",
   "note": "3 in glass tube Ø80.9 × Ø72.9 × 152.4: sight glass 200.4 face to face with two end pieces"
  },
  {
   "file": "sight-glass-seat-gasket-3in",
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    "step",
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   "stl": "https://xemstudio.com/files/hardware/tri-clamp-sight-glasses/sight-glass-seat-gasket-3in.stl",
   "note": "3 in flat seat gasket Ø80.9 × Ø72.9 × 1.5, one in each end seat"
  },
  {
   "file": "sight-glass-end-4in",
   "formats": [
    "step",
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   "license": "CC BY 4.0 (Xem Studio)",
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   "stl": "https://xemstudio.com/files/hardware/tri-clamp-sight-glasses/sight-glass-end-4in.stl",
   "note": "4 in sight-glass end piece (two per sight glass): clamp face, Ø129.4 body 30.0 long, glass seat Ø105.4 × 6.0, four Ø5.5 tie-rod holes on r 58.7"
  },
  {
   "file": "sight-glass-tube-4in-2in",
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   "stl": "https://xemstudio.com/files/hardware/tri-clamp-sight-glasses/sight-glass-tube-4in-2in.stl",
   "note": "4 in glass tube Ø105.4 × Ø97.4 × 50.8: sight glass 98.8 face to face with two end pieces"
  },
  {
   "file": "sight-glass-tube-4in-4in",
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    "step",
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   "license": "CC BY 4.0 (Xem Studio)",
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   "stl": "https://xemstudio.com/files/hardware/tri-clamp-sight-glasses/sight-glass-tube-4in-4in.stl",
   "note": "4 in glass tube Ø105.4 × Ø97.4 × 101.6: sight glass 149.6 face to face with two end pieces"
  },
  {
   "file": "sight-glass-tube-4in-6in",
   "formats": [
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   "license": "CC BY 4.0 (Xem Studio)",
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   "stl": "https://xemstudio.com/files/hardware/tri-clamp-sight-glasses/sight-glass-tube-4in-6in.stl",
   "note": "4 in glass tube Ø105.4 × Ø97.4 × 152.4: sight glass 200.4 face to face with two end pieces"
  },
  {
   "file": "sight-glass-seat-gasket-4in",
   "formats": [
    "step",
    "stl"
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   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/tri-clamp-sight-glasses/sight-glass-seat-gasket-4in.step",
   "stl": "https://xemstudio.com/files/hardware/tri-clamp-sight-glasses/sight-glass-seat-gasket-4in.stl",
   "note": "4 in flat seat gasket Ø105.4 × Ø97.4 × 1.5, one in each end seat"
  }
 ],
 "markdown": "https://xemstudio.com/objects/tri-clamp-sight-glasses/index.md"
}