{
 "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": "probe-clamps",
 "name": "Split probe clamps for Ø3, Ø4.8, Ø6 probes and Ø8 / Ø9.53 dial-indicator stems",
 "kind": "hardware",
 "category": "Stirling engines",
 "group": "Generators & instruments",
 "year": null,
 "question": "What are DS18B20 waterproof probe and K-type thermocouple probe dimensions?",
 "tags": [
  "thermocouple",
  "ds18b20",
  "dial indicator",
  "probe clamp",
  "instrument",
  "stirling",
  "long earth society"
 ],
 "aliases": [
  "ds18b20 probe dimensions",
  "k type thermocouple probe diameter",
  "thermocouple clamp",
  "dial indicator stem diameter",
  "probe holder 3d print"
 ],
 "overall_mm": {
  "length": null,
  "width": null,
  "height": null
 },
 "official_cad": false,
 "xem_status": "free-files",
 "les": true,
 "free_files": 5,
 "url": "https://xemstudio.com/objects/probe-clamps/",
 "sheet_txt": "https://xemstudio.com/objects/probe-clamps/sheet.txt",
 "sheet": {
  "basis": "Common probe sizes: DS18B20 sleeve Ø6 × 50, K-type sheathed Ø3 / Ø4.8 (3/16 in); dial-indicator stems Ø8 (metric) / Ø9.53 (3/8 in); M3 pinch at ISO 273 clearance",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "Each clamp is a 20 mm tall block, (bore + 10) × (bore + 12), with the bore at the probe or stem diameter exactly, a 1.2 mm pinch split from the bore to one edge, and a Ø3.4 (M3 clearance) pinch-screw hole crossing the split 3.5 mm outside the bore.",
   "DS18B20 waterproof probes have a Ø6 × 50 mm sleeve (a 30 mm version exists) and read −55 to 125 °C, so they belong on the cold side.",
   "K-type sheathed probes are Ø3 or Ø4.8 (3/16 in) × 100–150 mm and read to about 1100 °C; bare-bead K-type (0.3–1 mm wire) goes to about 1000 °C.",
   "Dial-indicator stems are Ø8 mm (metric) or Ø9.53 mm (3/8 in); I clamp one on the displacer rod to measure stroke while turning the engine by hand."
  ],
  "table": {
   "columns": [
    "clamp",
    "bore_mm",
    "body_mm",
    "for"
   ],
   "rows": [
    [
     "probe-clamp-k-type-3mm",
     3,
     "13 × 15 × 20",
     "K-type Ø3"
    ],
    [
     "probe-clamp-k-type-4-8mm",
     4.8,
     "14.8 × 16.8 × 20",
     "K-type 3/16 in"
    ],
    [
     "probe-clamp-ds18b20-6mm",
     6,
     "16 × 18 × 20",
     "DS18B20 sleeve"
    ],
    [
     "probe-clamp-dial-indicator-8mm",
     8,
     "18 × 20 × 20",
     "metric indicator stem"
    ],
    [
     "probe-clamp-dial-indicator-3-8in",
     9.53,
     "19.53 × 21.53 × 20",
     "3/8 in indicator stem"
    ]
   ]
  }
 },
 "sheet_text": "Split probe clamps for Ø3, Ø4.8, Ø6 probes and Ø8 / Ø9.53 dial-indicator stems — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/probe-clamps/  (CC BY 4.0)\nBasis: Common probe sizes: DS18B20 sleeve Ø6 × 50, K-type sheathed Ø3 / Ø4.8 (3/16 in); dial-indicator stems Ø8 (metric) / Ø9.53 (3/8 in); M3 pinch at ISO 273 clearance\nCatalog version: 2026-10-20\n\nSizes: see table below\n- Each clamp is a 20 mm tall block, (bore + 10) × (bore + 12), with the bore at the probe or stem diameter exactly, a 1.2 mm pinch split from the bore to one edge, and a Ø3.4 (M3 clearance) pinch-screw hole crossing the split 3.5 mm outside the bore.\n- DS18B20 waterproof probes have a Ø6 × 50 mm sleeve (a 30 mm version exists) and read −55 to 125 °C, so they belong on the cold side.\n- K-type sheathed probes are Ø3 or Ø4.8 (3/16 in) × 100–150 mm and read to about 1100 °C; bare-bead K-type (0.3–1 mm wire) goes to about 1000 °C.\n- Dial-indicator stems are Ø8 mm (metric) or Ø9.53 mm (3/8 in); I clamp one on the displacer rod to measure stroke while turning the engine by hand.\n\nclamp  bore_mm  body_mm  for\nprobe-clamp-k-type-3mm  3  13 × 15 × 20  K-type Ø3\nprobe-clamp-k-type-4-8mm  4.8  14.8 × 16.8 × 20  K-type 3/16 in\nprobe-clamp-ds18b20-6mm  6  16 × 18 × 20  DS18B20 sleeve\nprobe-clamp-dial-indicator-8mm  8  18 × 20 × 20  metric indicator stem\nprobe-clamp-dial-indicator-3-8in  9.53  19.53 × 21.53 × 20  3/8 in indicator stem\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- Wikipedia: Thermocouple — web — CC BY-SA 4.0 (text) — https://en.wikipedia.org/wiki/Thermocouple\n- Wikipedia: Hall effect sensor — web — CC BY-SA 4.0 (text) — https://en.wikipedia.org/wiki/Hall_effect_sensor\n- Wikipedia: Dial indicator — web — CC BY-SA 4.0 (text) — https://en.wikipedia.org/wiki/Dial_indicator\n- Analog Devices: DS18B20 datasheet — PDF — Manufacturer datasheet — https://www.analog.com/en/products/ds18b20.html\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, 5 parts): https://xemstudio.com/files/hardware/probe-clamps/index.json\nAPI: https://xemstudio.com/api/geometry?object=probe-clamps\n",
 "sources": [
  {
   "publisher": "Wikipedia",
   "title": "Thermocouple",
   "url": "https://en.wikipedia.org/wiki/Thermocouple",
   "formats": [
    "web"
   ],
   "license": "CC BY-SA 4.0 (text)",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Wikipedia",
   "title": "Hall effect sensor",
   "url": "https://en.wikipedia.org/wiki/Hall_effect_sensor",
   "formats": [
    "web"
   ],
   "license": "CC BY-SA 4.0 (text)",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Wikipedia",
   "title": "Dial indicator",
   "url": "https://en.wikipedia.org/wiki/Dial_indicator",
   "formats": [
    "web"
   ],
   "license": "CC BY-SA 4.0 (text)",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Analog Devices",
   "title": "DS18B20 datasheet",
   "url": "https://www.analog.com/en/products/ds18b20.html",
   "formats": [
    "PDF"
   ],
   "license": "Manufacturer datasheet",
   "license_verified": true,
   "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": [
  "hall-sensor-mount",
  "encoder-disc",
  "tri-clamp-ferrule",
  "thermoelectric-tec1",
  "socket-head-cap-screws-metric"
 ],
 "fits": [
  {
   "role": "Goes in or on",
   "items": [
    {
     "slug": "tri-clamp-ferrule",
     "why": "K-type at the hot end, DS18B20 on the cold spool"
    }
   ]
  },
  {
   "role": "Connects to",
   "items": [
    {
     "slug": "socket-head-cap-screws-metric",
     "why": "M3 pinch screw through the Ø3.4 hole"
    }
   ]
  },
  {
   "role": "Also needed",
   "items": [
    {
     "slug": "hall-sensor-mount",
     "why": "RPM alongside temperature"
    }
   ]
  }
 ],
 "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": "probe bore",
   "exact": "Ø6 / Ø3 / Ø4.8 / Ø8 / Ø9.53",
   "mates": "probe sheath or indicator stem",
   "fit": "clamp",
   "files": "probe-clamp-"
  },
  {
   "feature": "pinch split",
   "exact": "1.2",
   "mates": "closes on the probe",
   "fit": "clamp",
   "files": "probe-clamp-"
  },
  {
   "feature": "pinch screw hole",
   "exact": "Ø3.4",
   "mates": "M3 screw clearance",
   "fit": "designed",
   "files": "probe-clamp-"
  }
 ],
 "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 are the dimensions of a DS18B20 waterproof probe?",
   "a": "A Ø6 mm sleeve, 50 mm long (30 mm versions exist); it reads to 125 °C."
  },
  {
   "q": "What diameter are K-type thermocouple probes?",
   "a": "Sheathed probes are Ø3 or Ø4.8 mm (3/16 in), 100–150 mm long."
  },
  {
   "q": "What diameter is a dial indicator stem?",
   "a": "8 mm on metric indicators, 9.53 mm (3/8 in) on US ones."
  }
 ],
 "files_license": null,
 "offers": [
  {
   "file": "probe-clamp-ds18b20-6mm",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/instrument-mounts/probe-clamp-ds18b20-6mm.step",
   "stl": "https://xemstudio.com/files/hardware/instrument-mounts/probe-clamp-ds18b20-6mm.stl",
   "note": "split clamp for a Ø6 probe/stem (ds18b20 6mm): Ø6 bore, 1.2 mm split, M3 pinch (Ø3.4)"
  },
  {
   "file": "probe-clamp-k-type-3mm",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/instrument-mounts/probe-clamp-k-type-3mm.step",
   "stl": "https://xemstudio.com/files/hardware/instrument-mounts/probe-clamp-k-type-3mm.stl",
   "note": "split clamp for a Ø3 probe/stem (k type 3mm): Ø3 bore, 1.2 mm split, M3 pinch (Ø3.4)"
  },
  {
   "file": "probe-clamp-k-type-4-8mm",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/instrument-mounts/probe-clamp-k-type-4-8mm.step",
   "stl": "https://xemstudio.com/files/hardware/instrument-mounts/probe-clamp-k-type-4-8mm.stl",
   "note": "split clamp for a Ø4.8 probe/stem (k type 4 8mm): Ø4.8 bore, 1.2 mm split, M3 pinch (Ø3.4)"
  },
  {
   "file": "probe-clamp-dial-indicator-8mm",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/instrument-mounts/probe-clamp-dial-indicator-8mm.step",
   "stl": "https://xemstudio.com/files/hardware/instrument-mounts/probe-clamp-dial-indicator-8mm.stl",
   "note": "split clamp for a Ø8 probe/stem (dial indicator 8mm): Ø8 bore, 1.2 mm split, M3 pinch (Ø3.4)"
  },
  {
   "file": "probe-clamp-dial-indicator-3-8in",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/instrument-mounts/probe-clamp-dial-indicator-3-8in.step",
   "stl": "https://xemstudio.com/files/hardware/instrument-mounts/probe-clamp-dial-indicator-3-8in.stl",
   "note": "split clamp for a Ø9.53 probe/stem (dial indicator 3 8in): Ø9.53 bore, 1.2 mm split, M3 pinch (Ø3.4)"
  }
 ],
 "markdown": "https://xemstudio.com/objects/probe-clamps/index.md"
}