{
 "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": "bearing-pocket-gauge",
 "name": "Bearing pocket gauge for 623, 625 and 608 (Ø10 / Ø16 / Ø22, +0 / +0.2 / +0.4)",
 "kind": "hardware",
 "category": "Stirling engines",
 "group": "Generators & instruments",
 "year": null,
 "question": "How tight should a 3D printed 608 bearing pocket be?",
 "tags": [
  "calibration",
  "gauge",
  "bearing pocket",
  "tolerance",
  "608",
  "stirling",
  "long earth society"
 ],
 "aliases": [
  "bearing pocket tolerance",
  "608 pocket size 3d print",
  "bearing press fit test",
  "623 pocket gauge",
  "bearing seat calibration"
 ],
 "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/bearing-pocket-gauge/",
 "sheet_txt": "https://xemstudio.com/objects/bearing-pocket-gauge/sheet.txt",
 "sheet": {
  "basis": "Pockets at the bearing OD (623 Ø10, 625 Ø16, 608 Ø22) and +0.2 / +0.4, 6 deep",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "Every file on this site is drawn at exact size with no printing allowance; this gauge steps through sizes around the nominal so you can measure the allowance your process needs for one fit class, then apply it only to the features each object lists under Mating features.",
   "The gauge is a 100 × 36 × 8 mm block with nine pockets 6 mm deep: Ø10.0, 10.2, 10.4 (623), Ø16.0, 16.2, 16.4 (625), Ø22.0, 22.2, 22.4 (608).",
   "Press each bearing in with a thumb: the pocket that holds it, minus the bearing OD, is your bearing-pocket allowance.",
   "The three Ø22 pockets run out through the long edge of the block (they are 0.2–3.2 mm wider than the edge allows), which does not affect reading the bore."
  ],
  "table": {
   "columns": [
    "bearing",
    "od_mm",
    "pockets_mm",
    "depth_mm"
   ],
   "rows": [
    [
     "623",
     10,
     "10.0 / 10.2 / 10.4",
     6
    ],
    [
     "625",
     16,
     "16.0 / 16.2 / 16.4",
     6
    ],
    [
     "608",
     22,
     "22.0 / 22.2 / 22.4",
     6
    ]
   ]
  }
 },
 "sheet_text": "Bearing pocket gauge for 623, 625 and 608 (Ø10 / Ø16 / Ø22, +0 / +0.2 / +0.4) — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/bearing-pocket-gauge/  (CC BY 4.0)\nBasis: Pockets at the bearing OD (623 Ø10, 625 Ø16, 608 Ø22) and +0.2 / +0.4, 6 deep\nCatalog version: 2026-10-20\n\nSizes: see table below\n- Every file on this site is drawn at exact size with no printing allowance; this gauge steps through sizes around the nominal so you can measure the allowance your process needs for one fit class, then apply it only to the features each object lists under Mating features.\n- The gauge is a 100 × 36 × 8 mm block with nine pockets 6 mm deep: Ø10.0, 10.2, 10.4 (623), Ø16.0, 16.2, 16.4 (625), Ø22.0, 22.2, 22.4 (608).\n- Press each bearing in with a thumb: the pocket that holds it, minus the bearing OD, is your bearing-pocket allowance.\n- The three Ø22 pockets run out through the long edge of the block (they are 0.2–3.2 mm wider than the edge allows), which does not affect reading the bore.\n\nbearing  od_mm  pockets_mm  depth_mm\n623  10  10.0 / 10.2 / 10.4  6\n625  16  16.0 / 16.2 / 16.4  6\n608  22  22.0 / 22.2 / 22.4  6\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- Wikipedia: Engineering tolerance — web — CC BY-SA 4.0 (text) — https://en.wikipedia.org/wiki/Engineering_tolerance\n- Prusa: Knowledge base: XY size compensation — web — Prusa KB [verify license at link] — https://help.prusa3d.com/article/xy-size-compensation_125045\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/bearing-pocket-gauge/index.json\nAPI: https://xemstudio.com/api/geometry?object=bearing-pocket-gauge\n",
 "sources": [
  {
   "publisher": "Wikipedia",
   "title": "Engineering tolerance",
   "url": "https://en.wikipedia.org/wiki/Engineering_tolerance",
   "formats": [
    "web"
   ],
   "license": "CC BY-SA 4.0 (text)",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Prusa",
   "title": "Knowledge base: XY size compensation",
   "url": "https://help.prusa3d.com/article/xy-size-compensation_125045",
   "formats": [
    "web"
   ],
   "license": "Prusa KB",
   "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": [
  "608-bearing",
  "ball-bearings-metric",
  "hole-gauges",
  "pin-gauges"
 ],
 "fits": [
  {
   "role": "Connects to",
   "items": [
    {
     "slug": "608-bearing",
     "why": "Ø22 OD into the 22.x pockets"
    },
    {
     "slug": "ball-bearings-metric",
     "why": "623 Ø10 and 625 Ø16 into their pockets"
    }
   ]
  },
  {
   "role": "Also needed",
   "items": [
    {
     "slug": "pin-gauges",
     "why": "the bore side of the same bearings"
    }
   ]
  }
 ],
 "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": "gauge sizes",
   "exact": "stepped around nominal",
   "mates": "the true pin, nut, bearing or extrusion slot being tested",
   "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": "What size pocket for a 608 bearing?",
   "a": "The bearing is Ø22; the pocket is drawn at Ø22.000 and this gauge shows how much your process needs on top."
  },
  {
   "q": "Which bearings does the gauge cover?",
   "a": "623 (Ø10), 625 (Ø16) and 608 (Ø22)."
  }
 ],
 "files_license": null,
 "offers": [
  {
   "file": "bearing-pocket-gauge-623-625-608",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/printer-calibration-coupons/bearing-pocket-gauge-623-625-608.step",
   "stl": "https://xemstudio.com/files/hardware/printer-calibration-coupons/bearing-pocket-gauge-623-625-608.stl",
   "note": "bearing pocket gauge, 100 × 48 × 8 block: Ø10.0/10.2/10.4 (623) and Ø16.0/16.2/16.4 (625) in the top row, Ø22.0/22.2/22.4 (608) in the bottom row, 6 deep, every pocket separate with at least 2.9 mm of wall to its neighbours and the block edges"
  }
 ],
 "markdown": "https://xemstudio.com/objects/bearing-pocket-gauge/index.md"
}