{
 "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": "shaft-collars",
 "name": "Set-screw shaft collars Ø3 to Ø12",
 "kind": "hardware",
 "category": "Hardware",
 "group": "Motion",
 "year": null,
 "question": "What are the dimensions of a shaft collar for a 5 mm or 8 mm shaft?",
 "tags": [
  "shaft collar",
  "collar",
  "set screw",
  "shaft",
  "axial location",
  "stirling",
  "long earth society"
 ],
 "aliases": [
  "shaft collar 5mm",
  "shaft collar 8mm dimensions",
  "set screw collar sizes",
  "shaft collar stl"
 ],
 "overall_mm": {
  "length": null,
  "width": null,
  "height": null
 },
 "official_cad": false,
 "xem_status": "free-files",
 "les": true,
 "free_files": 7,
 "url": "https://xemstudio.com/objects/shaft-collars/",
 "sheet_txt": "https://xemstudio.com/objects/shaft-collars/sheet.txt",
 "sheet": {
  "basis": "Metric set-screw collar envelopes; bore = shaft Ø, radial tapped hole at the ISO tap drill",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "A ring with one radial tapped hole at mid-width: bore Ø × OD × width and screw: 3 × 8 × 5 M3; 4 × 9 × 5 M3; 5 × 10 × 6 M3; 6 × 12 × 7 M3; 8 × 16 × 8 M4; 10 × 20 × 10 M4; 12 × 22 × 10 M5.",
   "The bore is the shaft Ø exactly; the screw hole is drawn at the tap drill: Ø2.5 (M3), Ø3.3 (M4), Ø4.2 (M5).",
   "A collar each side of a bearing locates a shaft along its axis; the set screw seats on the shaft's D-flat."
  ],
  "table": {
   "columns": [
    "file",
    "bore",
    "OD",
    "width",
    "screw",
    "tap drill"
   ],
   "rows": [
    [
     "collar-3mm",
     3,
     8,
     5,
     "M3",
     2.5
    ],
    [
     "collar-4mm",
     4,
     9,
     5,
     "M3",
     2.5
    ],
    [
     "collar-5mm",
     5,
     10,
     6,
     "M3",
     2.5
    ],
    [
     "collar-6mm",
     6,
     12,
     7,
     "M3",
     2.5
    ],
    [
     "collar-8mm",
     8,
     16,
     8,
     "M4",
     3.3
    ],
    [
     "collar-10mm",
     10,
     20,
     10,
     "M4",
     3.3
    ],
    [
     "collar-12mm",
     12,
     22,
     10,
     "M5",
     4.2
    ]
   ]
  }
 },
 "sheet_text": "Set-screw shaft collars Ø3 to Ø12 — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/shaft-collars/  (CC BY 4.0)\nBasis: Metric set-screw collar envelopes; bore = shaft Ø, radial tapped hole at the ISO tap drill\nCatalog version: 2026-10-20\n\nSizes: see table below\n- A ring with one radial tapped hole at mid-width: bore Ø × OD × width and screw: 3 × 8 × 5 M3; 4 × 9 × 5 M3; 5 × 10 × 6 M3; 6 × 12 × 7 M3; 8 × 16 × 8 M4; 10 × 20 × 10 M4; 12 × 22 × 10 M5.\n- The bore is the shaft Ø exactly; the screw hole is drawn at the tap drill: Ø2.5 (M3), Ø3.3 (M4), Ø4.2 (M5).\n- A collar each side of a bearing locates a shaft along its axis; the set screw seats on the shaft's D-flat.\n\nfile  bore  OD  width  screw  tap drill\ncollar-3mm  3  8  5  M3  2.5\ncollar-4mm  4  9  5  M3  2.5\ncollar-5mm  5  10  6  M3  2.5\ncollar-6mm  6  12  7  M3  2.5\ncollar-8mm  8  16  8  M4  3.3\ncollar-10mm  10  20  10  M4  3.3\ncollar-12mm  12  22  10  M5  4.2\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- Wikipedia: Circlip — web — CC BY-SA 4.0 (text) — https://en.wikipedia.org/wiki/Circlip\n- Wikipedia: Retaining ring — web — CC BY-SA 4.0 (text) — https://en.wikipedia.org/wiki/Retaining_ring\n- McMaster-Carr: Shaft collars (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/shaft-collars/\n- McMaster-Carr: Retaining rings (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/retaining-rings/\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, 7 parts): https://xemstudio.com/files/hardware/shaft-collars/index.json\nAPI: https://xemstudio.com/api/geometry?object=shaft-collars\n",
 "sources": [
  {
   "publisher": "Wikipedia",
   "title": "Circlip",
   "url": "https://en.wikipedia.org/wiki/Circlip",
   "formats": [
    "web"
   ],
   "license": "CC BY-SA 4.0 (text)",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Wikipedia",
   "title": "Retaining ring",
   "url": "https://en.wikipedia.org/wiki/Retaining_ring",
   "formats": [
    "web"
   ],
   "license": "CC BY-SA 4.0 (text)",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "McMaster-Carr",
   "title": "Shaft collars (free STEP per part, for your own design use; no redistribution)",
   "url": "https://www.mcmaster.com/products/shaft-collars/",
   "formats": [
    "STEP",
    "PDF"
   ],
   "license": "McMaster-Carr site terms",
   "license_verified": false,
   "hosted": false
  },
  {
   "publisher": "McMaster-Carr",
   "title": "Retaining rings (free STEP per part, for your own design use; no redistribution)",
   "url": "https://www.mcmaster.com/products/retaining-rings/",
   "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": [
  "metric-shafts",
  "set-screws-metric",
  "e-clips-din-6799",
  "circlips-din-471",
  "pillow-block-kp08"
 ],
 "fits": [
  {
   "role": "Goes in or on",
   "items": [
    {
     "slug": "metric-shafts",
     "why": "bore = shaft Ø, screw on the D-flat"
    }
   ]
  },
  {
   "role": "Connects to",
   "items": [
    {
     "slug": "pillow-block-kp08",
     "why": "one each side of the 608"
    }
   ]
  },
  {
   "role": "Alternatives",
   "items": [
    {
     "slug": "e-clips-din-6799",
     "why": "clip in a groove"
    }
   ]
  },
  {
   "role": "Also needed",
   "items": [
    {
     "slug": "set-screws-metric",
     "why": "M3 / M4 / M5 set screw"
    }
   ]
  }
 ],
 "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": "collar bore",
   "exact": "Ø3–Ø12 (= shaft Ø)",
   "mates": "shaft of the same Ø",
   "fit": "slide",
   "files": "collar-"
  },
  {
   "feature": "collar set-screw hole",
   "exact": "Ø2.5 / Ø3.3 / Ø4.2",
   "mates": "M3 / M4 / M5 tap drill",
   "fit": "designed",
   "files": "collar-"
  }
 ],
 "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 shaft collar for an 8 mm shaft?",
   "a": "Ø8 bore, 16 OD, 8 wide, M4 set screw (Ø3.3 tap-drill hole)."
  },
  {
   "q": "What size shaft collar for a 5 mm shaft?",
   "a": "Ø5 bore, 10 OD, 6 wide, M3 set screw (Ø2.5 tap-drill hole)."
  }
 ],
 "files_license": null,
 "offers": [
  {
   "file": "collar-3mm",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/shaft-collars-clips-and-shafts/collar-3mm.step",
   "stl": "https://xemstudio.com/files/hardware/shaft-collars-clips-and-shafts/collar-3mm.stl",
   "note": "set-screw shaft collar Ø3 bore, OD 8, 5 wide, M3"
  },
  {
   "file": "collar-4mm",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/shaft-collars-clips-and-shafts/collar-4mm.step",
   "stl": "https://xemstudio.com/files/hardware/shaft-collars-clips-and-shafts/collar-4mm.stl",
   "note": "set-screw shaft collar Ø4 bore, OD 9, 5 wide, M3"
  },
  {
   "file": "collar-5mm",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/shaft-collars-clips-and-shafts/collar-5mm.step",
   "stl": "https://xemstudio.com/files/hardware/shaft-collars-clips-and-shafts/collar-5mm.stl",
   "note": "set-screw shaft collar Ø5 bore, OD 10, 6 wide, M3"
  },
  {
   "file": "collar-6mm",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/shaft-collars-clips-and-shafts/collar-6mm.step",
   "stl": "https://xemstudio.com/files/hardware/shaft-collars-clips-and-shafts/collar-6mm.stl",
   "note": "set-screw shaft collar Ø6 bore, OD 12, 7 wide, M3"
  },
  {
   "file": "collar-8mm",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/shaft-collars-clips-and-shafts/collar-8mm.step",
   "stl": "https://xemstudio.com/files/hardware/shaft-collars-clips-and-shafts/collar-8mm.stl",
   "note": "set-screw shaft collar Ø8 bore, OD 16, 8 wide, M4"
  },
  {
   "file": "collar-10mm",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/shaft-collars-clips-and-shafts/collar-10mm.step",
   "stl": "https://xemstudio.com/files/hardware/shaft-collars-clips-and-shafts/collar-10mm.stl",
   "note": "set-screw shaft collar Ø10 bore, OD 20, 10 wide, M4"
  },
  {
   "file": "collar-12mm",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/shaft-collars-clips-and-shafts/collar-12mm.step",
   "stl": "https://xemstudio.com/files/hardware/shaft-collars-clips-and-shafts/collar-12mm.stl",
   "note": "set-screw shaft collar Ø12 bore, OD 22, 10 wide, M5"
  }
 ],
 "markdown": "https://xemstudio.com/objects/shaft-collars/index.md"
}