{
 "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-displacer",
 "name": "Tri-clamp displacer: Ø33.6, Ø46 and Ø70.9 for 1.5, 2 and 3 in spools",
 "kind": "hardware",
 "category": "Stirling engines",
 "group": "Tri-clamp engine parts",
 "year": null,
 "question": "What size displacer fits a 2 inch tri-clamp spool?",
 "tags": [
  "displacer",
  "tri-clamp",
  "stirling",
  "spool",
  "gamma",
  "beta",
  "long earth society"
 ],
 "aliases": [
  "tri clamp stirling displacer",
  "displacer for 2 inch spool",
  "stirling displacer stl",
  "46 mm displacer",
  "tri clamp displacer dimensions"
 ],
 "overall_mm": {
  "length": null,
  "width": null,
  "height": null
 },
 "official_cad": false,
 "xem_status": "free-files",
 "les": true,
 "free_files": 27,
 "url": "https://xemstudio.com/objects/tri-clamp-displacer/",
 "sheet_txt": "https://xemstudio.com/objects/tri-clamp-displacer/sheet.txt",
 "sheet": {
  "basis": "16 ga ASME BPE tube bores (1.5 in 34.8, 2 in 47.5, 3 in 72.9 mm) minus a designed radial gap of 0.6 / 0.75 / 1.0 mm (Senft, low-temperature-difference air engines)",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "The displacer is a closed cylinder that runs in the spool bore with a designed radial gap: 0.6 mm in the 1.5 in spool (Ø33.6 in Ø34.8), 0.75 mm in the 2 in (Ø46.0 in Ø47.5), 1.0 mm in the 3 in (Ø70.9 in Ø72.9). The gap is part of the design and is drawn as is.",
   "Lengths: 1.5 in 50 / 75 / 100, 2 in 60 / 90 / 120, 3 in 80 / 120 / 160 mm. Each length comes two ways: a hollow shell (1 mm wall, closed rounded end, 1.2 mm internal rings every 25 mm) with its end cap, and a solid body of the same diameter and length with a Ø3 centre hole and two 0.6 mm slots crossing on the axis through the full length, so the file is four quarter-segments around the centre hole.",
   "The shell's end cap has a spigot Ø(D − 2) × 3 that enters the shell, a Ø D × 1.5 flange, and a Ø16 × 6 boss with the Ø3 rod hole and a Ø2.5 radial hole for an M3 grub at 8 mm; the cap stands 10.5 mm overall. One cap file per spool size serves every length.",
   "The Ø3 rod is the displacer rod: it leaves through the displacer head or crank head on the cold end. Every hole that meets another part is in the Mating features table."
  ],
  "table": {
   "columns": [
    "spool_in",
    "bore_mm",
    "displacer_od_mm",
    "length_mm",
    "radial_gap_mm"
   ],
   "rows": [
    [
     "1.5",
     34.8,
     33.6,
     50,
     0.6
    ],
    [
     "1.5",
     34.8,
     33.6,
     75,
     0.6
    ],
    [
     "1.5",
     34.8,
     33.6,
     100,
     0.6
    ],
    [
     "2",
     47.5,
     46,
     60,
     0.75
    ],
    [
     "2",
     47.5,
     46,
     90,
     0.75
    ],
    [
     "2",
     47.5,
     46,
     120,
     0.75
    ],
    [
     "3",
     72.9,
     70.9,
     80,
     1
    ],
    [
     "3",
     72.9,
     70.9,
     120,
     1
    ],
    [
     "3",
     72.9,
     70.9,
     160,
     1
    ]
   ]
  }
 },
 "sheet_text": "Tri-clamp displacer: Ø33.6, Ø46 and Ø70.9 for 1.5, 2 and 3 in spools — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/tri-clamp-displacer/  (CC BY 4.0)\nBasis: 16 ga ASME BPE tube bores (1.5 in 34.8, 2 in 47.5, 3 in 72.9 mm) minus a designed radial gap of 0.6 / 0.75 / 1.0 mm (Senft, low-temperature-difference air engines)\nCatalog version: 2026-10-20\n\nSizes: see table below\n- The displacer is a closed cylinder that runs in the spool bore with a designed radial gap: 0.6 mm in the 1.5 in spool (Ø33.6 in Ø34.8), 0.75 mm in the 2 in (Ø46.0 in Ø47.5), 1.0 mm in the 3 in (Ø70.9 in Ø72.9). The gap is part of the design and is drawn as is.\n- Lengths: 1.5 in 50 / 75 / 100, 2 in 60 / 90 / 120, 3 in 80 / 120 / 160 mm. Each length comes two ways: a hollow shell (1 mm wall, closed rounded end, 1.2 mm internal rings every 25 mm) with its end cap, and a solid body of the same diameter and length with a Ø3 centre hole and two 0.6 mm slots crossing on the axis through the full length, so the file is four quarter-segments around the centre hole.\n- The shell's end cap has a spigot Ø(D − 2) × 3 that enters the shell, a Ø D × 1.5 flange, and a Ø16 × 6 boss with the Ø3 rod hole and a Ø2.5 radial hole for an M3 grub at 8 mm; the cap stands 10.5 mm overall. One cap file per spool size serves every length.\n- The Ø3 rod is the displacer rod: it leaves through the displacer head or crank head on the cold end. Every hole that meets another part is in the Mating features table.\n\nspool_in  bore_mm  displacer_od_mm  length_mm  radial_gap_mm\n1.5  34.8  33.6  50  0.6\n1.5  34.8  33.6  75  0.6\n1.5  34.8  33.6  100  0.6\n2  47.5  46.0  60  0.75\n2  47.5  46.0  90  0.75\n2  47.5  46.0  120  0.75\n3  72.9  70.9  80  1.0\n3  72.9  70.9  120  1.0\n3  72.9  70.9  160  1.0\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- Long Earth Society: Tri-clamp Stirling engine builds — web, video — LES site — https://longearthsociety.com/engineering/\n- James R. Senft: An Introduction to Low Temperature Differential Stirling Engines (displacer and gap design) — book — Moriya Press [verify license at link] — https://www.stirlingengine.com/\n- Wikipedia: Stirling engine — web — CC BY-SA 4.0 (text) — https://en.wikipedia.org/wiki/Stirling_engine\n\nFree files (CC BY 4.0, Xem Studio; STEP + STL, 27 parts): https://xemstudio.com/files/hardware/tri-clamp-displacer/index.json\nAPI: https://xemstudio.com/api/geometry?object=tri-clamp-displacer\n",
 "sources": [
  {
   "publisher": "Long Earth Society",
   "title": "Tri-clamp Stirling engine builds",
   "url": "https://longearthsociety.com/engineering/",
   "formats": [
    "web",
    "video"
   ],
   "license": "LES site",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "James R. Senft",
   "title": "An Introduction to Low Temperature Differential Stirling Engines (displacer and gap design)",
   "url": "https://www.stirlingengine.com/",
   "formats": [
    "book"
   ],
   "license": "Moriya Press",
   "license_verified": false,
   "hosted": false
  },
  {
   "publisher": "Wikipedia",
   "title": "Stirling engine",
   "url": "https://en.wikipedia.org/wiki/Stirling_engine",
   "formats": [
    "web"
   ],
   "license": "CC BY-SA 4.0 (text)",
   "license_verified": true,
   "hosted": false
  }
 ],
 "xem": {
  "status": "free-files",
  "sheet_free": true,
  "mesh_price_usd": null,
  "step_price_usd": null,
  "tolerance_mm": null
 },
 "related": [
  "tri-clamp-spool",
  "tri-clamp-displacer-head",
  "tri-clamp-crank-head",
  "tri-clamp-regenerative-displacer",
  "tri-clamp-cups",
  "stirling-crankshafts"
 ],
 "fits": [
  {
   "role": "Parts that fit it",
   "items": [
    {
     "slug": "regenerator-mesh-disc",
     "why": "matrix in the regenerative displacer's slots"
    },
    {
     "slug": "crank-discs-3mm-bore",
     "why": "on the crank head's Ø3 shaft between the 623 towers"
    },
    {
     "slug": "displacer-rods",
     "why": "Ø3 rod in the displacer cap socket and the head's Ø3 bore"
    }
   ]
  },
  {
   "role": "Goes in or on",
   "items": [
    {
     "slug": "tri-clamp-spool",
     "why": "Ø46 displacer in the Ø47.5 bore, 0.75 mm radial gap"
    },
    {
     "slug": "tri-clamp-cups",
     "why": "same 47.5 bore with the hot end closed"
    }
   ]
  },
  {
   "role": "Connects to",
   "items": [
    {
     "slug": "tri-clamp-displacer-head",
     "why": "Ø3 rod from the cap through the head's Ø3 bore"
    },
    {
     "slug": "tri-clamp-crank-head",
     "why": "Ø3 rod through the crank head to a crank"
    }
   ]
  },
  {
   "role": "Alternatives",
   "items": [
    {
     "slug": "tri-clamp-regenerative-displacer",
     "why": "single-spool engine with the regenerator in the gap"
    }
   ]
  },
  {
   "role": "Also needed",
   "items": [
    {
     "slug": "stirling-crankshafts",
     "why": "Ø3 displacer rod"
    }
   ]
  }
 ],
 "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": "displacer OD in the spool bore",
   "exact": "bore − 2 × 0.6 / 0.75 / 1.0",
   "mates": "tri-clamp-spool bore",
   "fit": "designed",
   "files": "displacer-"
  },
  {
   "feature": "cap spigot in the shell",
   "exact": "shell bore",
   "mates": "displacer shell",
   "fit": "slide",
   "files": "displacer-cap-"
  },
  {
   "feature": "cap rod hole",
   "exact": "Ø3",
   "mates": "Ø3 displacer rod (M3 grub)",
   "fit": "slide",
   "files": "displacer-cap-"
  },
  {
   "feature": "cap grub hole",
   "exact": "Ø2.5",
   "mates": "M3 tap drill",
   "fit": "designed",
   "files": "displacer-cap-"
  },
  {
   "feature": "displacer-body rod bore",
   "exact": "Ø3",
   "mates": "Ø3 displacer rod",
   "fit": "slide",
   "files": "displacer-body-"
  }
 ],
 "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 diameter displacer fits a 2 inch tri-clamp spool?",
   "a": "Ø46.0 mm in the Ø47.5 bore, a 0.75 mm radial gap, in 60, 90 or 120 mm lengths."
  },
  {
   "q": "How much gap is there between the displacer and the spool?",
   "a": "0.6 mm radial in the 1.5 in spool, 0.75 mm in the 2 in, 1.0 mm in the 3 in: a designed gap, drawn at that size."
  },
  {
   "q": "How does the rod attach to the displacer?",
   "a": "Through the end cap: a Ø3 hole in a Ø16 × 6 boss, held by an M3 grub in a Ø2.5 radial hole 8 mm up the cap."
  },
  {
   "q": "Is there a solid version?",
   "a": "Yes: each length also comes as one solid body of the same diameter and length (Ø × L), with a Ø3 centre hole and two 0.6 mm cross slots."
  }
 ],
 "files_license": null,
 "offers": [
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   "stl": "https://xemstudio.com/files/hardware/tri-clamp-displacers-and-heads/displacer-shell-1.5in-50.stl",
   "note": "1.5 in shell displacer Ø33.6 × 50 for the Ø34.8 bore (0.6 mm radial gap), 1 mm wall, internal rings every 25 mm, closed rounded end"
  },
  {
   "file": "displacer-cap-1.5in",
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   "note": "1.5 in displacer end cap with Ø3 rod boss and M3 grub (Ø2.5 tapped) at 8 mm; one per displacer"
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  {
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   "note": "1.5 in displacer end cap with Ø3 rod boss and M3 grub (Ø2.5 tapped) at 8 mm; one per displacer"
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   "note": "1.5 in shell displacer Ø33.6 × 100 for the Ø34.8 bore (0.6 mm radial gap), 1 mm wall, internal rings every 25 mm, closed rounded end"
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   "note": "1.5 in displacer end cap with Ø3 rod boss and M3 grub (Ø2.5 tapped) at 8 mm; one per displacer"
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   "note": "2 in shell displacer Ø46 × 60 for the Ø47.5 bore (0.75 mm radial gap), 1 mm wall, internal rings every 25 mm, closed rounded end"
  },
  {
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   "note": "2 in shell displacer Ø46 × 90 for the Ø47.5 bore (0.75 mm radial gap), 1 mm wall, internal rings every 25 mm, closed rounded end"
  },
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   "note": "2 in displacer end cap with Ø3 rod boss and M3 grub (Ø2.5 tapped) at 8 mm; one per displacer"
  },
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  },
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   "file": "displacer-shell-2in-120",
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   "stl": "https://xemstudio.com/files/hardware/tri-clamp-displacers-and-heads/displacer-shell-2in-120.stl",
   "note": "2 in shell displacer Ø46 × 120 for the Ø47.5 bore (0.75 mm radial gap), 1 mm wall, internal rings every 25 mm, closed rounded end"
  },
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   "note": "2 in displacer end cap with Ø3 rod boss and M3 grub (Ø2.5 tapped) at 8 mm; one per displacer"
  },
  {
   "file": "displacer-body-2in-120",
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   "stl": "https://xemstudio.com/files/hardware/tri-clamp-displacers-and-heads/displacer-body-2in-120.stl",
   "note": "2 in solid displacer body Ø46 × 120 with a Ø3 rod bore on the axis"
  },
  {
   "file": "displacer-shell-3in-80",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/tri-clamp-displacers-and-heads/displacer-shell-3in-80.step",
   "stl": "https://xemstudio.com/files/hardware/tri-clamp-displacers-and-heads/displacer-shell-3in-80.stl",
   "note": "3 in shell displacer Ø70.9 × 80 for the Ø72.9 bore (1.0 mm radial gap), 1 mm wall, internal rings every 25 mm, closed rounded end"
  },
  {
   "file": "displacer-cap-3in",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/tri-clamp-displacers-and-heads/displacer-cap-3in.step",
   "stl": "https://xemstudio.com/files/hardware/tri-clamp-displacers-and-heads/displacer-cap-3in.stl",
   "note": "3 in displacer end cap with Ø3 rod boss and M3 grub (Ø2.5 tapped) at 8 mm; one per displacer"
  },
  {
   "file": "displacer-body-3in-80",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/tri-clamp-displacers-and-heads/displacer-body-3in-80.step",
   "stl": "https://xemstudio.com/files/hardware/tri-clamp-displacers-and-heads/displacer-body-3in-80.stl",
   "note": "3 in solid displacer body Ø70.9 × 80 with a Ø3 rod bore on the axis"
  },
  {
   "file": "displacer-shell-3in-120",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/tri-clamp-displacers-and-heads/displacer-shell-3in-120.step",
   "stl": "https://xemstudio.com/files/hardware/tri-clamp-displacers-and-heads/displacer-shell-3in-120.stl",
   "note": "3 in shell displacer Ø70.9 × 120 for the Ø72.9 bore (1.0 mm radial gap), 1 mm wall, internal rings every 25 mm, closed rounded end"
  },
  {
   "file": "displacer-cap-3in",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/tri-clamp-displacers-and-heads/displacer-cap-3in.step",
   "stl": "https://xemstudio.com/files/hardware/tri-clamp-displacers-and-heads/displacer-cap-3in.stl",
   "note": "3 in displacer end cap with Ø3 rod boss and M3 grub (Ø2.5 tapped) at 8 mm; one per displacer"
  },
  {
   "file": "displacer-body-3in-120",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/tri-clamp-displacers-and-heads/displacer-body-3in-120.step",
   "stl": "https://xemstudio.com/files/hardware/tri-clamp-displacers-and-heads/displacer-body-3in-120.stl",
   "note": "3 in solid displacer body Ø70.9 × 120 with a Ø3 rod bore on the axis"
  },
  {
   "file": "displacer-shell-3in-160",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/tri-clamp-displacers-and-heads/displacer-shell-3in-160.step",
   "stl": "https://xemstudio.com/files/hardware/tri-clamp-displacers-and-heads/displacer-shell-3in-160.stl",
   "note": "3 in shell displacer Ø70.9 × 160 for the Ø72.9 bore (1.0 mm radial gap), 1 mm wall, internal rings every 25 mm, closed rounded end"
  },
  {
   "file": "displacer-cap-3in",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/tri-clamp-displacers-and-heads/displacer-cap-3in.step",
   "stl": "https://xemstudio.com/files/hardware/tri-clamp-displacers-and-heads/displacer-cap-3in.stl",
   "note": "3 in displacer end cap with Ø3 rod boss and M3 grub (Ø2.5 tapped) at 8 mm; one per displacer"
  },
  {
   "file": "displacer-body-3in-160",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/tri-clamp-displacers-and-heads/displacer-body-3in-160.step",
   "stl": "https://xemstudio.com/files/hardware/tri-clamp-displacers-and-heads/displacer-body-3in-160.stl",
   "note": "3 in solid displacer body Ø70.9 × 160 with a Ø3 rod bore on the axis"
  }
 ],
 "markdown": "https://xemstudio.com/objects/tri-clamp-displacer/index.md"
}