{
 "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": "ceramic-standoff",
 "name": "Ceramic standoff Ø10 × 20 mm, Ø4.3 hole (M4)",
 "kind": "hardware",
 "category": "Stirling engines",
 "group": "Heat & regenerator",
 "year": null,
 "question": "What size ceramic standoff for M4 screws?",
 "tags": [
  "standoff",
  "ceramic",
  "insulation",
  "hot end",
  "stirling",
  "long earth society"
 ],
 "aliases": [
  "ceramic standoff m4",
  "standoff 10x20 dimensions",
  "high temperature standoff",
  "ceramic spacer 10mm",
  "hot end standoff"
 ],
 "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/ceramic-standoff/",
 "sheet_txt": "https://xemstudio.com/objects/ceramic-standoff/sheet.txt",
 "sheet": {
  "basis": "Standoff Ø10 × 20 with an ISO 273 fine M4 clearance hole (Ø4.3)",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "The file is a Ø10 × 20 mm cylinder with a Ø4.3 through hole, the ISO 273 fine clearance for an M4 screw.",
   "Standoffs of this kind come in Ø6–12 × 10–30 mm.",
   "They space the hot end off a frame so heat does not conduct into it; I use two on the cold-side mounts."
  ],
  "table": {
   "columns": [
    "standoff",
    "od_mm",
    "length_mm",
    "hole_mm",
    "screw"
   ],
   "rows": [
    [
     "ceramic-standoff-10x20",
     10,
     20,
     4.3,
     "M4"
    ]
   ]
  }
 },
 "sheet_text": "Ceramic standoff Ø10 × 20 mm, Ø4.3 hole (M4) — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/ceramic-standoff/  (CC BY 4.0)\nBasis: Standoff Ø10 × 20 with an ISO 273 fine M4 clearance hole (Ø4.3)\nCatalog version: 2026-10-20\n\nSizes: see table below\n- The file is a Ø10 × 20 mm cylinder with a Ø4.3 through hole, the ISO 273 fine clearance for an M4 screw.\n- Standoffs of this kind come in Ø6–12 × 10–30 mm.\n- They space the hot end off a frame so heat does not conduct into it; I use two on the cold-side mounts.\n\nstandoff  od_mm  length_mm  hole_mm  screw\nceramic-standoff-10x20  10  20  4.3  M4\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- Wikipedia: Mesh (scale) — web — CC BY-SA 4.0 (text) — https://en.wikipedia.org/wiki/Mesh_(scale)\n- Wikipedia: Regenerative heat exchanger — web — CC BY-SA 4.0 (text) — https://en.wikipedia.org/wiki/Regenerative_heat_exchanger\n- Wikipedia: Steel wool — web — CC BY-SA 4.0 (text) — https://en.wikipedia.org/wiki/Steel_wool\n- McMaster-Carr: Wire cloth (free STEP per part, for your own design use; no redistribution) — STEP, PDF — McMaster-Carr site terms [verify license at link] — https://www.mcmaster.com/products/wire-cloth/\n- Long Earth Society: Engine and rig 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/ceramic-standoff/index.json\nAPI: https://xemstudio.com/api/geometry?object=ceramic-standoff\n",
 "sources": [
  {
   "publisher": "Wikipedia",
   "title": "Mesh (scale)",
   "url": "https://en.wikipedia.org/wiki/Mesh_(scale)",
   "formats": [
    "web"
   ],
   "license": "CC BY-SA 4.0 (text)",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Wikipedia",
   "title": "Regenerative heat exchanger",
   "url": "https://en.wikipedia.org/wiki/Regenerative_heat_exchanger",
   "formats": [
    "web"
   ],
   "license": "CC BY-SA 4.0 (text)",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Wikipedia",
   "title": "Steel wool",
   "url": "https://en.wikipedia.org/wiki/Steel_wool",
   "formats": [
    "web"
   ],
   "license": "CC BY-SA 4.0 (text)",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "McMaster-Carr",
   "title": "Wire cloth (free STEP per part, for your own design use; no redistribution)",
   "url": "https://www.mcmaster.com/products/wire-cloth/",
   "formats": [
    "STEP",
    "PDF"
   ],
   "license": "McMaster-Carr site terms",
   "license_verified": false,
   "hosted": false
  },
  {
   "publisher": "Long Earth Society",
   "title": "Engine and rig 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": [
  "insulating-firebrick",
  "socket-head-cap-screws-metric",
  "threaded-standoffs-metric",
  "tri-clamp-ferrule"
 ],
 "fits": [
  {
   "role": "Connects to",
   "items": [
    {
     "slug": "socket-head-cap-screws-metric",
     "why": "M4 screw through the Ø4.3 hole"
    }
   ]
  },
  {
   "role": "Alternatives",
   "items": [
    {
     "slug": "threaded-standoffs-metric",
     "why": "metal standoffs where heat is not a concern"
    }
   ]
  },
  {
   "role": "Also needed",
   "items": [
    {
     "slug": "insulating-firebrick",
     "why": "base under the burner"
    }
   ]
  }
 ],
 "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": "standoff hole",
   "exact": "Ø4.3",
   "mates": "M4 screw clearance (ISO 273 fine)",
   "fit": "designed",
   "files": "ceramic-standoff-"
  }
 ],
 "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 hole size for an M4 ceramic standoff?",
   "a": "Ø4.3, the ISO 273 fine clearance; the standoff is Ø10 × 20 mm."
  },
  {
   "q": "What sizes do high-temperature standoffs come in?",
   "a": "Ø6–12 mm by 10–30 mm long; this file is Ø10 × 20."
  }
 ],
 "files_license": null,
 "offers": [
  {
   "file": "ceramic-standoff-10x20",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/regenerator-and-heat-materials/ceramic-standoff-10x20.step",
   "stl": "https://xemstudio.com/files/hardware/regenerator-and-heat-materials/ceramic-standoff-10x20.stl",
   "note": "ceramic / steatite standoff Ø10 × 20, Ø4.3 hole (M4 clearance, ISO 273 fine)"
  }
 ],
 "markdown": "https://xemstudio.com/objects/ceramic-standoff/index.md"
}