{
 "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-racking-arms",
 "name": "Tri-clamp racking arm: 1½ in clamp body and ½ in arms, 2 to 6 in reach",
 "kind": "hardware",
 "category": "Hardware",
 "group": "Sanitary clamp fittings",
 "year": null,
 "question": "What is a tri-clamp racking arm?",
 "tags": [
  "racking arm",
  "racking",
  "fermenter",
  "sanitary",
  "tri-clamp",
  "clamp fitting",
  "brewing",
  "homebrew"
 ],
 "aliases": [
  "tri clamp racking arm",
  "1.5 racking arm",
  "rotating racking arm stl"
 ],
 "overall_mm": {
  "length": null,
  "width": null,
  "height": null
 },
 "official_cad": false,
 "xem_status": "free-files",
 "les": false,
 "free_files": 4,
 "url": "https://xemstudio.com/objects/tri-clamp-racking-arms/",
 "sheet_txt": "https://xemstudio.com/objects/tri-clamp-racking-arms/sheet.txt",
 "sheet": {
  "basis": "Xem Studio design: a 1½ in clamp body with a sealed bore for ½ in tube (two O-rings), and a bent arm that turns inside the vessel",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "Turn the arm down to draw from the bottom, up to rack clear beer off the yeast. Fits a 1½ in side port on a fermenter.",
   "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": [
    "reach_in",
    "reach_mm",
    "tube_od_mm",
    "o_rings"
   ],
   "rows": [
    [
     2,
     50.8,
     12.7,
     "AS568-012 × 2"
    ],
    [
     4,
     101.6,
     12.7,
     "AS568-012 × 2"
    ],
    [
     6,
     152.4,
     12.7,
     "AS568-012 × 2"
    ]
   ]
  }
 },
 "sheet_text": "Tri-clamp racking arm: 1½ in clamp body and ½ in arms, 2 to 6 in reach — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/tri-clamp-racking-arms/  (CC BY 4.0)\nBasis: Xem Studio design: a 1½ in clamp body with a sealed bore for ½ in tube (two O-rings), and a bent arm that turns inside the vessel\nCatalog version: 2026-10-20\n\nSizes: see table below\n- Turn the arm down to draw from the bottom, up to rack clear beer off the yeast. Fits a 1½ in side port on a fermenter.\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\nreach_in  reach_mm  tube_od_mm  o_rings\n2  50.8  12.7  AS568-012 × 2\n4  101.6  12.7  AS568-012 × 2\n6  152.4  12.7  AS568-012 × 2\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, 4 parts): https://xemstudio.com/files/hardware/tri-clamp-racking-arms/index.json\nAPI: https://xemstudio.com/api/geometry?object=tri-clamp-racking-arms\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-dip-tube-caps",
  "tri-clamp-dished-bottom-vessels",
  "tri-clamp-butterfly-valves"
 ],
 "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 seals the arm?",
   "a": "Two AS568-012 O-rings in the body bore; the arm turns in them."
  }
 ],
 "files_license": null,
 "offers": [
  {
   "file": "racking-arm-body-1.5in",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/tri-clamp-racking-arms/racking-arm-body-1.5in.step",
   "stl": "https://xemstudio.com/files/hardware/tri-clamp-racking-arms/racking-arm-body-1.5in.stl",
   "note": "1½ in clamp body: Ø24 boss 40 long, Ø12.8 bore with two AS568-012 O-ring grooves for ½ in tube"
  },
  {
   "file": "racking-arm-tube-2in",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/tri-clamp-racking-arms/racking-arm-tube-2in.step",
   "stl": "https://xemstudio.com/files/hardware/tri-clamp-racking-arms/racking-arm-tube-2in.stl",
   "note": "½ in (Ø12.7 × 1.6) arm: 60 straight through the body, 90° bend on R25, 2 in reach"
  },
  {
   "file": "racking-arm-tube-4in",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/tri-clamp-racking-arms/racking-arm-tube-4in.step",
   "stl": "https://xemstudio.com/files/hardware/tri-clamp-racking-arms/racking-arm-tube-4in.stl",
   "note": "½ in (Ø12.7 × 1.6) arm: 60 straight through the body, 90° bend on R25, 4 in reach"
  },
  {
   "file": "racking-arm-tube-6in",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/tri-clamp-racking-arms/racking-arm-tube-6in.step",
   "stl": "https://xemstudio.com/files/hardware/tri-clamp-racking-arms/racking-arm-tube-6in.stl",
   "note": "½ in (Ø12.7 × 1.6) arm: 60 straight through the body, 90° bend on R25, 6 in reach"
  }
 ],
 "markdown": "https://xemstudio.com/objects/tri-clamp-racking-arms/index.md"
}