{
 "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": "crank-stands-625",
 "name": "Crank stands with a 625 pocket, 40 and 60 mm axis height",
 "kind": "hardware",
 "category": "Stirling engines",
 "group": "Drives & mechanisms",
 "year": null,
 "question": "What holds a 5 mm crankshaft above a base plate on 625 bearings?",
 "tags": [
  "crank stand",
  "625",
  "bearing block",
  "gamma",
  "stirling",
  "long earth society"
 ],
 "aliases": [
  "crank stand 625 bearing",
  "stirling crankshaft support",
  "5mm shaft bearing stand",
  "crank bearing upright"
 ],
 "overall_mm": {
  "length": null,
  "width": null,
  "height": null
 },
 "official_cad": false,
 "xem_status": "free-files",
 "les": true,
 "free_files": 2,
 "url": "https://xemstudio.com/objects/crank-stands-625/",
 "sheet_txt": "https://xemstudio.com/objects/crank-stands-625/sheet.txt",
 "sheet": {
  "basis": "Upright with a Ø16 × 5 pocket at the 625 OD; slotted foot for M3 at 42 mm",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "A 30 wide × 8 thick upright with a rounded top (R15) on a 50 × 24 × 3 foot. Shaft axis 40 or 60 mm above the foot's underside; overall 55 or 75 tall.",
   "A Ø16 × 5 pocket (625 OD) on one face at the axis, and a Ø11.2 clearance hole through so the Ø5 shaft passes without contact.",
   "Two slots 3.4 × 10 in the foot, 42 mm apart, for M3 into the gamma base plate slots. Two stands carry one shaft."
  ],
  "table": {
   "columns": [
    "file",
    "axis height",
    "overall height",
    "pocket",
    "clearance hole",
    "foot"
   ],
   "rows": [
    [
     "crank-stand-625-h40",
     40,
     55,
     "Ø16 × 5",
     "Ø11.2",
     "50 × 24 × 3, slots 3.4 at 42"
    ],
    [
     "crank-stand-625-h60",
     60,
     75,
     "Ø16 × 5",
     "Ø11.2",
     "50 × 24 × 3, slots 3.4 at 42"
    ]
   ]
  }
 },
 "sheet_text": "Crank stands with a 625 pocket, 40 and 60 mm axis height — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/crank-stands-625/  (CC BY 4.0)\nBasis: Upright with a Ø16 × 5 pocket at the 625 OD; slotted foot for M3 at 42 mm\nCatalog version: 2026-10-20\n\nSizes: see table below\n- A 30 wide × 8 thick upright with a rounded top (R15) on a 50 × 24 × 3 foot. Shaft axis 40 or 60 mm above the foot's underside; overall 55 or 75 tall.\n- A Ø16 × 5 pocket (625 OD) on one face at the axis, and a Ø11.2 clearance hole through so the Ø5 shaft passes without contact.\n- Two slots 3.4 × 10 in the foot, 42 mm apart, for M3 into the gamma base plate slots. Two stands carry one shaft.\n\nfile  axis height  overall height  pocket  clearance hole  foot\ncrank-stand-625-h40  40  55  Ø16 × 5  Ø11.2  50 × 24 × 3, slots 3.4 at 42\ncrank-stand-625-h60  60  75  Ø16 × 5  Ø11.2  50 × 24 × 3, slots 3.4 at 42\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\nFree files (CC BY 4.0, Xem Studio; STEP + STL, 2 parts): https://xemstudio.com/files/hardware/crank-stands-625/index.json\nAPI: https://xemstudio.com/api/geometry?object=crank-stands-625\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
  }
 ],
 "xem": {
  "status": "free-files",
  "sheet_free": true,
  "mesh_price_usd": null,
  "step_price_usd": null,
  "tolerance_mm": null
 },
 "related": [
  "stirling-crankshafts",
  "tri-clamp-engine-base-plate",
  "ball-bearings-metric",
  "counterweighted-crank-discs",
  "shaft-spacers"
 ],
 "fits": [
  {
   "role": "Parts that fit it",
   "items": [
    {
     "slug": "counterweighted-crank-discs",
     "why": "on the shaft beside the 625 stand"
    },
    {
     "slug": "nut-pocket-flywheels",
     "why": "on the Ø5 shaft outside the stand"
    }
   ]
  },
  {
   "role": "Goes in or on",
   "items": [
    {
     "slug": "tri-clamp-engine-base-plate",
     "why": "M3 through the foot slots into the plate slots"
    }
   ]
  },
  {
   "role": "Connects to",
   "items": [
    {
     "slug": "ball-bearings-metric",
     "why": "625 in the Ø16 pocket"
    },
    {
     "slug": "stirling-crankshafts",
     "why": "Ø5 shaft through the 625"
    }
   ]
  },
  {
   "role": "Also needed",
   "items": [
    {
     "slug": "shaft-spacers",
     "why": "1 mm gap to the crank disc"
    }
   ]
  }
 ],
 "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": "crank-stand bearing pocket",
   "exact": "Ø16",
   "mates": "625 bearing",
   "fit": "press",
   "files": "crank-stand-"
  },
  {
   "feature": "crank-stand foot slots",
   "exact": "3.4 wide",
   "mates": "M3 screw clearance",
   "fit": "designed",
   "files": "crank-stand-"
  },
  {
   "feature": "crank-stand shaft clearance",
   "exact": "Ø11.2",
   "mates": "Ø5 shaft (no contact)",
   "fit": "designed",
   "files": "crank-stand-"
  }
 ],
 "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 bearing goes in the crank stand?",
   "a": "A 625 (5 × 16 × 5) in the Ø16 × 5 pocket."
  },
  {
   "q": "How high is the crankshaft on the stands?",
   "a": "40 or 60 mm from the bottom of the foot to the shaft axis."
  }
 ],
 "files_license": null,
 "offers": [
  {
   "file": "crank-stand-625-h40",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/stirling-linkage-fittings/crank-stand-625-h40.step",
   "stl": "https://xemstudio.com/files/hardware/stirling-linkage-fittings/crank-stand-625-h40.stl",
   "note": "crank stand, Ø5 shaft axis 40 mm up, Ø16 × 5 pocket for a 625 bearing, Ø11.2 shaft clearance, 50 × 24 × 3 foot with 2 × M3 slots 3.4 × 10 (along the shaft) on 42 mm centres across the shaft; two carry one crankshaft and seat on the gamma base plate's slots"
  },
  {
   "file": "crank-stand-625-h60",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/stirling-linkage-fittings/crank-stand-625-h60.step",
   "stl": "https://xemstudio.com/files/hardware/stirling-linkage-fittings/crank-stand-625-h60.stl",
   "note": "crank stand, Ø5 shaft axis 60 mm up, Ø16 × 5 pocket for a 625 bearing, Ø11.2 shaft clearance, 50 × 24 × 3 foot with 2 × M3 slots 3.4 × 10 (along the shaft) on 42 mm centres across the shaft; two carry one crankshaft and seat on the gamma base plate's slots"
  }
 ],
 "markdown": "https://xemstudio.com/objects/crank-stands-625/index.md"
}