{ "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-spools", "name": "Sanitary clamp spools: 3, 6 and 12 in, ½ to 4 in", "kind": "standard", "category": "Hardware", "group": "Sanitary clamp fittings", "year": null, "question": "How long are tri-clamp spools and what is their bore?", "tags": [ "spool", "tri-clamp", "sanitary", "tube" ], "aliases": [ "tri clamp spool", "sanitary spool dimensions", "tri clamp spool 6 inch", "tri clamp spool stl" ], "overall_mm": { "length": null, "width": null, "height": null }, "official_cad": false, "xem_status": "free-files", "les": false, "free_files": 24, "url": "https://xemstudio.com/objects/sanitary-clamp-spools/", "sheet_txt": "https://xemstudio.com/objects/sanitary-clamp-spools/sheet.txt", "sheet": { "basis": "ASME BPE / 3-A clamp-fitting dimensions published identically by Dixon and Steel & O'Brien; ISO 2852 face profile", "overall_mm": { "length": null, "width": null, "height": null }, "notes": [ "A spool: BPE tube with an ISO 2852 face at each end, 76.2, 152.4 or 304.8 mm (3, 6, 12 in) face to face.", "Bore 9.4 / 15.75 / 22.1 / 34.8 / 47.5 / 60.2 / 72.9 / 97.38 mm for ½ to 4 in (tube OD minus two 1.65 mm walls; 2.11 at 4 in).", "Faces are the ISO 2852 profile (2.85 mm rim, 1.6 mm gasket recess, 20° back cone) on the BPE flange diameters; the groove diameter on ½, ¾ and 4 in is derived (flange − 7.0 / 7.5 mm), the rest is from the standard." ], "table": { "columns": [ "size_in", "tube_od_mm", "bore_mm", "flange_od_mm", "lengths_mm" ], "rows": [ [ "½", 12.7, 9.4, 25, "76.2 / 152.4 / 304.8" ], [ "¾", 19.05, 15.75, 25, "76.2 / 152.4 / 304.8" ], [ "1", 25.4, 22.1, 50.5, "76.2 / 152.4 / 304.8" ], [ "1½", 38.1, 34.8, 50.5, "76.2 / 152.4 / 304.8" ], [ "2", 50.8, 47.5, 64, "76.2 / 152.4 / 304.8" ], [ "2½", 63.5, 60.2, 77.5, "76.2 / 152.4 / 304.8" ], [ "3", 76.2, 72.9, 91, "76.2 / 152.4 / 304.8" ], [ "4", 101.6, 97.38, 119, "76.2 / 152.4 / 304.8" ] ] } }, "sheet_text": "Sanitary clamp spools: 3, 6 and 12 in, ½ to 4 in — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/sanitary-clamp-spools/ (CC BY 4.0)\nBasis: ASME BPE / 3-A clamp-fitting dimensions published identically by Dixon and Steel & O'Brien; ISO 2852 face profile\nCatalog version: 2026-10-20\n\nSizes: see table below\n- A spool: BPE tube with an ISO 2852 face at each end, 76.2, 152.4 or 304.8 mm (3, 6, 12 in) face to face.\n- Bore 9.4 / 15.75 / 22.1 / 34.8 / 47.5 / 60.2 / 72.9 / 97.38 mm for ½ to 4 in (tube OD minus two 1.65 mm walls; 2.11 at 4 in).\n- Faces are the ISO 2852 profile (2.85 mm rim, 1.6 mm gasket recess, 20° back cone) on the BPE flange diameters; the groove diameter on ½, ¾ and 4 in is derived (flange − 7.0 / 7.5 mm), the rest is from the standard.\n\nsize_in tube_od_mm bore_mm flange_od_mm lengths_mm\n½ 12.7 9.4 25.0 76.2 / 152.4 / 304.8\n¾ 19.05 15.75 25.0 76.2 / 152.4 / 304.8\n1 25.4 22.1 50.5 76.2 / 152.4 / 304.8\n1½ 38.1 34.8 50.5 76.2 / 152.4 / 304.8\n2 50.8 47.5 64.0 76.2 / 152.4 / 304.8\n2½ 63.5 60.2 77.5 76.2 / 152.4 / 304.8\n3 76.2 72.9 91.0 76.2 / 152.4 / 304.8\n4 101.6 97.38 119.0 76.2 / 152.4 / 304.8\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, 24 parts): https://xemstudio.com/files/hardware/sanitary-clamp-spools/index.json\nAPI: https://xemstudio.com/api/geometry?object=sanitary-clamp-spools\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": [ "standard" ], "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-ferrules", "sanitary-clamp-end-caps", "sanitary-clamp-gaskets", "tri-clamp-spool", "tri-clamp-clamps" ], "fits": [ { "role": "Connects to", "items": [ { "slug": "sanitary-clamp-tees", "why": "any fitting with the same flange" }, { "slug": "sanitary-clamp-end-caps", "why": "cap either end" } ] }, { "role": "Alternatives", "items": [ { "slug": "tri-clamp-spool", "why": "the original 1½ / 2 in spools" } ] }, { "role": "Also needed", "items": [ { "slug": "sanitary-clamp-gaskets", "why": "gasket per joint" }, { "slug": "tri-clamp-clamps", "why": "clamp per joint" } ] } ], "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", "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": "What is the bore of a 2 inch tri-clamp spool?", "a": "47.5 mm (50.8 OD, 1.65 wall); 34.8 at 1½ in, 72.9 at 3 in." }, { "q": "What lengths are the spools?", "a": "3, 6 and 12 in face to face: 76.2, 152.4 and 304.8 mm." } ], "files_license": null, "offers": [ { "file": "spool-0.5in-3in", "formats": [ "step", "stl" ], "price_usd": 0, "license": "CC BY 4.0 (Xem Studio)", "step": "https://xemstudio.com/files/hardware/sanitary-clamp-caps-ferrules-spools/spool-0.5in-3in.step", "stl": "https://xemstudio.com/files/hardware/sanitary-clamp-caps-ferrules-spools/spool-0.5in-3in.stl", "note": "½ in spool, 3 in face to face" }, { "file": "spool-0.5in-6in", "formats": [ "step", "stl" ], "price_usd": 0, "license": "CC BY 4.0 (Xem Studio)", "step": 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