{
 "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": "bicycle-bottle-cage-bosses",
 "name": "Bicycle bottle-cage bosses: M5 × 0.8 on 64 mm",
 "kind": "standard",
 "category": "Everyday mounts",
 "group": "Bicycle",
 "year": null,
 "question": "What is the bottle cage bolt spacing on a bike?",
 "tags": [
  "bicycle",
  "bottle cage",
  "bosses",
  "mount",
  "m5"
 ],
 "aliases": [
  "bottle cage bolt spacing",
  "bottle cage mount spacing",
  "water bottle bosses",
  "bottle cage screw size",
  "64mm bottle cage",
  "bike bottle mount step"
 ],
 "overall_mm": {
  "length": null,
  "width": null,
  "height": null
 },
 "official_cad": false,
 "xem_status": "free-files",
 "les": false,
 "free_files": 1,
 "url": "https://xemstudio.com/objects/bicycle-bottle-cage-bosses/",
 "sheet_txt": "https://xemstudio.com/objects/bicycle-bottle-cage-bosses/sheet.txt",
 "sheet": {
  "basis": "Wikipedia, Bottle cage: two holes 64 mm (2 1/2 in) apart, threaded for M5 × 0.8; a standard cage holds a 73 mm bottle",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "Frames carry pairs of threaded bosses (or rivet nuts) for a bottle cage: M5 × 0.8, 64 mm between centres. The same pair is used for pumps, tool kits, accessory cages and many mounts.",
   "The 64 mm is the published metric figure; 2 1/2 in is 63.5 mm. Slotted cage holes take up the difference; for a part with round holes, check the frame.",
   "Files: the pattern as a DXF (two Ø5 circles, the M5 major diameter, 64.0 apart) and a template strip 80 × 12 × 3 (my size) with Ø5.5 holes, the ISO 273 medium clearance for M5.",
   "A standard cage holds a Ø73 mm bottle."
  ],
  "table": {
   "columns": [
    "feature",
    "mm",
    "from"
   ],
   "rows": [
    [
     "boss spacing",
     "64 (2 1/2 in)",
     "Wikipedia, Bottle cage"
    ],
    [
     "thread",
     "M5 × 0.8",
     "Wikipedia, Bottle cage"
    ],
    [
     "bottle a standard cage holds",
     "Ø73",
     "Wikipedia, Bottle cage"
    ],
    [
     "clearance hole drawn",
     "Ø5.5 (M5 medium, ISO 273)",
     "ISO 273"
    ]
   ]
  }
 },
 "sheet_text": "Bicycle bottle-cage bosses: M5 × 0.8 on 64 mm — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/bicycle-bottle-cage-bosses/  (CC BY 4.0)\nBasis: Wikipedia, Bottle cage: two holes 64 mm (2 1/2 in) apart, threaded for M5 × 0.8; a standard cage holds a 73 mm bottle\nCatalog version: 2026-10-20\n\nSizes: see table below\n- Frames carry pairs of threaded bosses (or rivet nuts) for a bottle cage: M5 × 0.8, 64 mm between centres. The same pair is used for pumps, tool kits, accessory cages and many mounts.\n- The 64 mm is the published metric figure; 2 1/2 in is 63.5 mm. Slotted cage holes take up the difference; for a part with round holes, check the frame.\n- Files: the pattern as a DXF (two Ø5 circles, the M5 major diameter, 64.0 apart) and a template strip 80 × 12 × 3 (my size) with Ø5.5 holes, the ISO 273 medium clearance for M5.\n- A standard cage holds a Ø73 mm bottle.\n\nfeature  mm  from\nboss spacing  64 (2 1/2 in)  Wikipedia, Bottle cage\nthread  M5 × 0.8  Wikipedia, Bottle cage\nbottle a standard cage holds  Ø73  Wikipedia, Bottle cage\nclearance hole drawn  Ø5.5 (M5 medium, ISO 273)  ISO 273\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- Wikipedia: Bottle cage: two M5 × 0.8 holes 64 mm apart; standard cage holds a 73 mm bottle — web — CC BY-SA 4.0 (text) [verify license at link] — https://en.wikipedia.org/wiki/Bottle_cage\n\nFree files (CC BY 4.0, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/bicycle-bottle-cage-bosses/index.json\nAPI: https://xemstudio.com/api/geometry?object=bicycle-bottle-cage-bosses\n",
 "sources": [
  {
   "publisher": "Wikipedia",
   "title": "Bottle cage: two M5 × 0.8 holes 64 mm apart; standard cage holds a 73 mm bottle",
   "url": "https://en.wikipedia.org/wiki/Bottle_cage",
   "formats": [
    "web"
   ],
   "license": "CC BY-SA 4.0 (text)",
   "license_verified": false,
   "hosted": false
  }
 ],
 "xem": {
  "status": "free-files",
  "sheet_free": true,
  "mesh_price_usd": null,
  "step_price_usd": null,
  "tolerance_mm": null
 },
 "related": [
  "bicycle-handlebar-diameters",
  "bicycle-seatpost-diameters",
  "socket-head-cap-screws-metric"
 ],
 "fits": [
  {
   "role": "Connects to",
   "items": [
    {
     "slug": "socket-head-cap-screws-metric",
     "why": "two M5 × 0.8 screws into the bosses"
    }
   ]
  },
  {
   "role": "Alternatives",
   "items": [
    {
     "slug": "handlebar-clamp-rings",
     "why": "a clamp on the bar or post where there are no bosses"
    }
   ]
  }
 ],
 "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": "holes",
   "exact": "Ø5.5 on 64.0",
   "mates": "M5 × 0.8 screws into the frame bosses (ISO 273 medium clearance)",
   "fit": "designed",
   "files": "bottle-boss-"
  }
 ],
 "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 is the bottle cage bolt spacing?",
   "a": "64 mm between centres (2 1/2 in), M5 × 0.8 screws."
  },
  {
   "q": "What size screws hold a bottle cage?",
   "a": "M5 × 0.8, usually 10–12 mm long, into the frame's bosses."
  },
  {
   "q": "What diameter bottle does a cage hold?",
   "a": "73 mm on a standard cage."
  }
 ],
 "files_license": null,
 "offers": [
  {
   "file": "bottle-boss-pattern-64-m5",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/bicycle-bottle-cage-bosses/bottle-boss-pattern-64-m5.step",
   "stl": "https://xemstudio.com/files/hardware/bicycle-bottle-cage-bosses/bottle-boss-pattern-64-m5.stl",
   "note": "Bottle-cage boss pattern: two holes 64.0 apart, Ø5.5 (M5 medium clearance, ISO 273) in an 80 × 12 × 3 round-ended template strip (the strip size is mine); DXF = two Ø5 circles (M5 major) 64.0 apart"
  }
 ],
 "markdown": "https://xemstudio.com/objects/bicycle-bottle-cage-bosses/index.md"
}