{
 "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": "htd-hot-cup-10in",
 "name": "HTD hot cup: 10 in tri-clamp closed-end cup (welded floor)",
 "kind": "hardware",
 "category": "Stirling engines",
 "group": "Tri-clamp engine parts",
 "year": null,
 "question": "How do I make a 10 inch tri-clamp hot end with no gasket in the flame?",
 "tags": [
  "htd",
  "hot end",
  "hot cup",
  "tri-clamp",
  "stirling",
  "closed end"
 ],
 "aliases": [
  "10 inch tri clamp hot end",
  "welded bottom tri clamp spool",
  "tri clamp pot stirling",
  "htd stirling hot plate"
 ],
 "overall_mm": {
  "length": null,
  "width": null,
  "height": null
 },
 "official_cad": false,
 "xem_status": "free-files",
 "les": true,
 "free_files": 1,
 "url": "https://xemstudio.com/objects/htd-hot-cup-10in/",
 "sheet_txt": "https://xemstudio.com/objects/htd-hot-cup-10in/sheet.txt",
 "sheet": {
  "basis": "Fabrication spec: an L14AM7-type 10 in ferrule end on Ø254 × 3.40 tube, closed by a 12.7 plate welded flush with the tube OD; exact geometry",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "The hot face is one piece: the floor is welded to the tube, so the only joint is the clamp at the top, 48 mm of tube wall above the flame (main HTD). That wall is also the engine's biggest heat leak: about 335 W conducted from a 450 °C floor to a 77 °C cap at 16 W/m·K (a lower-conductivity wall leaks proportionally less).",
   "Floor: 12.7 thick. At the 6 bar gauge relief setting, treated as simply supported at the bore (conservative for a welded edge), it sees 70 MPa at the centre and bows 0.25 mm (Roark Table 11.2). The floor must be rated for that at its working temperature; I hold the hot face at or below 450 °C.",
   "The cup's own ferrule face takes the standard 10 in gasket and clamp."
  ],
  "table": {
   "columns": [
    "part",
    "length_mm",
    "floor_mm",
    "chamber_face_to_floor_mm"
   ],
   "rows": [
    [
     "hot-cup-10in-60.4",
     60.4,
     12.7,
     47.7
    ]
   ]
  }
 },
 "sheet_text": "HTD hot cup: 10 in tri-clamp closed-end cup (welded floor) — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/htd-hot-cup-10in/  (CC BY 4.0)\nBasis: Fabrication spec: an L14AM7-type 10 in ferrule end on Ø254 × 3.40 tube, closed by a 12.7 plate welded flush with the tube OD; exact geometry\nCatalog version: 2026-10-20\n\nSizes: see table below\n- The hot face is one piece: the floor is welded to the tube, so the only joint is the clamp at the top, 48 mm of tube wall above the flame (main HTD). That wall is also the engine's biggest heat leak: about 335 W conducted from a 450 °C floor to a 77 °C cap at 16 W/m·K (a lower-conductivity wall leaks proportionally less).\n- Floor: 12.7 thick. At the 6 bar gauge relief setting, treated as simply supported at the bore (conservative for a welded edge), it sees 70 MPa at the centre and bows 0.25 mm (Roark Table 11.2). The floor must be rated for that at its working temperature; I hold the hot face at or below 450 °C.\n- The cup's own ferrule face takes the standard 10 in gasket and clamp.\n\npart  length_mm  floor_mm  chamber_face_to_floor_mm\nhot-cup-10in-60.4  60.4  12.7  47.7\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- Steel & O'Brien: Sanitary products catalog 2024: 16AMP end caps 10 / 12 in (A 0.480, B 10.570 / 12.570 in); L14AM7 ferrules 1.500 in; clamp ratings 13MHHM, 13MHP, 13ASME — PDF — publisher's catalogue; dimensions cited, nothing copied — https://www.steelobrien.com/wp-content/uploads/2024/03/Sanitary-2024-FINAL.pdf\n- Holland Applied Technologies: Sanitary tri-clamp fittings: EG14AM7 ferrules 8 / 10 / 12 in (1.500, bore 9.732 / 11.732 in, tube 10.000 / 12.000 in); EG16A caps (10.570 / 12.570 in) — PDF — publisher's catalogue; dimensions cited, nothing copied — https://hollandapt.com/wp-content/uploads/2022/12/Sanitary-Tri-Clamp-Fittings.pdf\n- McGraw-Hill: Young & Budynas, Roark's Formulas for Stress and Strain, 7th ed.: Table 8.1 (fixed–guided beam), Table 11.2 (circular plates under uniform pressure) — book — formulas are facts [verify license at link] — https://www.accessengineeringlibrary.com/content/book/9780071742474\n- Long Earth Society: Engine builds — web, video — LES site — https://longearthsociety.com/engineering/\n\nFree files (CC BY 4.0, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/htd-hot-cup-10in/index.json\nAPI: https://xemstudio.com/api/geometry?object=htd-hot-cup-10in\n",
 "sources": [
  {
   "publisher": "Steel & O'Brien",
   "title": "Sanitary products catalog 2024: 16AMP end caps 10 / 12 in (A 0.480, B 10.570 / 12.570 in); L14AM7 ferrules 1.500 in; clamp ratings 13MHHM, 13MHP, 13ASME",
   "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
  },
  {
   "publisher": "Holland Applied Technologies",
   "title": "Sanitary tri-clamp fittings: EG14AM7 ferrules 8 / 10 / 12 in (1.500, bore 9.732 / 11.732 in, tube 10.000 / 12.000 in); EG16A caps (10.570 / 12.570 in)",
   "url": "https://hollandapt.com/wp-content/uploads/2022/12/Sanitary-Tri-Clamp-Fittings.pdf",
   "formats": [
    "PDF"
   ],
   "license": "publisher's catalogue; dimensions cited, nothing copied",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "McGraw-Hill",
   "title": "Young & Budynas, Roark's Formulas for Stress and Strain, 7th ed.: Table 8.1 (fixed–guided beam), Table 11.2 (circular plates under uniform pressure)",
   "url": "https://www.accessengineeringlibrary.com/content/book/9780071742474",
   "formats": [
    "book"
   ],
   "license": "formulas are facts",
   "license_verified": false,
   "hosted": false
  },
  {
   "publisher": "Long Earth Society",
   "title": "Engine builds",
   "url": "https://longearthsociety.com/engineering/",
   "formats": [
    "web",
    "video"
   ],
   "license": "LES site",
   "license_verified": true,
   "hosted": false
  }
 ],
 "xem": {
  "status": "free-files",
  "sheet_free": true,
  "mesh_price_usd": null,
  "step_price_usd": null,
  "tolerance_mm": null
 },
 "related": [
  "list-htd-10in",
  "htd-cold-caps-10in",
  "sanitary-clamp-ferrules-10-12in"
 ],
 "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": [
  {
   "feature": "face",
   "exact": "ISO 2852 10 in",
   "mates": "gasket-10in + 10 in clamp",
   "fit": "clamp",
   "files": "all"
  },
  {
   "feature": "bore",
   "exact": "Ø247.19 to the floor",
   "mates": "displacer Ø240 (3.6 radial, no contact)",
   "fit": "designed",
   "files": "all"
  },
  {
   "feature": "floor weld",
   "exact": "Ø254 × 12.7 flush with the tube OD",
   "mates": "tube end (welded, sealed)",
   "fit": "designed",
   "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": "Why a welded floor instead of a cap?",
   "a": "A cap would put a gasket and a clamp in the flame. With the floor welded on, the only joint sits up at the cold cap."
  }
 ],
 "files_license": null,
 "offers": [
  {
   "file": "hot-cup-10in-60.4",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/htd-hot-cup-10in/hot-cup-10in-60.4.step",
   "stl": "https://xemstudio.com/files/hardware/htd-hot-cup-10in/hot-cup-10in-60.4.stl",
   "note": "10 in × 60.4 closed-end cup: ISO 2852 face, Ø254 × 3.40 tube, 12.7 floor welded flush (main HTD: chamber 51.0 face to floor with the cap)"
  }
 ],
 "markdown": "https://xemstudio.com/objects/htd-hot-cup-10in/index.md"
}