{
 "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": "mason-jars-and-lids",
 "name": "Mason jars: regular (70 mm) and wide-mouth (86 mm), half-pint to half-gallon",
 "kind": "standard",
 "category": "Hardware",
 "group": "Found & household materials",
 "year": null,
 "question": "What is the diameter of a mason jar lid?",
 "tags": [
  "jar",
  "mason jar",
  "lid",
  "glass",
  "chamber",
  "stirling",
  "long earth society",
  "found materials"
 ],
 "aliases": [
  "mason jar lid diameter",
  "wide mouth mason jar size",
  "quart jar dimensions",
  "ball jar lid size mm",
  "mason jar lid 3d print"
 ],
 "overall_mm": {
  "length": null,
  "width": null,
  "height": null
 },
 "official_cad": false,
 "xem_status": "free-files",
 "les": true,
 "free_files": 0,
 "url": "https://xemstudio.com/objects/mason-jars-and-lids/",
 "sheet_txt": "https://xemstudio.com/objects/mason-jars-and-lids/sheet.txt",
 "sheet": {
  "basis": "Ball / Kerr standard: regular mouth 70 mm (2.75 in) lid, wide mouth 86 mm (3.38 in) lid; jar outer dimensions typical, vary ±2 mm by maker",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "Lids: regular mouth Ø70 mm, wide mouth Ø86 mm (the flat disc); bands are 72 and 88 mm OD. Thread on the jar: 70 mm continuous-thread finish, about 15 mm tall; 86 mm about 17 mm.",
   "Jars (regular mouth): half-pint 8 oz Ø65 × 95 mm; pint Ø78 × 130; quart Ø90 × 175. Wide mouth: pint Ø86 × 125; quart Ø90 × 170; half-gallon Ø110 × 240. Glass 2.5–3.5 mm.",
   "A printed disc that replaces the flat lid is Ø70.0 or Ø86.0 × 2 mm and clamps with the stock band: that is the pressure boundary for a jar-bodied engine or a vacuum chamber (a quart jar holds full vacuum with margin). Keep flames off the glass; the jar is the cold side."
  ],
  "table": {
   "columns": [
    "jar",
    "mouth",
    "lid_dia_mm",
    "band_od_mm",
    "jar_od_mm",
    "height_mm"
   ],
   "rows": [
    [
     "half-pint",
     "regular",
     70,
     72,
     65,
     95
    ],
    [
     "pint",
     "regular",
     70,
     72,
     78,
     130
    ],
    [
     "quart",
     "regular",
     70,
     72,
     90,
     175
    ],
    [
     "pint",
     "wide",
     86,
     88,
     86,
     125
    ],
    [
     "quart",
     "wide",
     86,
     88,
     90,
     170
    ],
    [
     "half-gallon",
     "wide",
     86,
     88,
     110,
     240
    ]
   ]
  }
 },
 "sheet_text": "Mason jars: regular (70 mm) and wide-mouth (86 mm), half-pint to half-gallon — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/mason-jars-and-lids/  (CC BY 4.0)\nBasis: Ball / Kerr standard: regular mouth 70 mm (2.75 in) lid, wide mouth 86 mm (3.38 in) lid; jar outer dimensions typical, vary ±2 mm by maker\nCatalog version: 2026-10-20\n\nSizes: see table below\n- Lids: regular mouth Ø70 mm, wide mouth Ø86 mm (the flat disc); bands are 72 and 88 mm OD. Thread on the jar: 70 mm continuous-thread finish, about 15 mm tall; 86 mm about 17 mm.\n- Jars (regular mouth): half-pint 8 oz Ø65 × 95 mm; pint Ø78 × 130; quart Ø90 × 175. Wide mouth: pint Ø86 × 125; quart Ø90 × 170; half-gallon Ø110 × 240. Glass 2.5–3.5 mm.\n- A printed disc that replaces the flat lid is Ø70.0 or Ø86.0 × 2 mm and clamps with the stock band: that is the pressure boundary for a jar-bodied engine or a vacuum chamber (a quart jar holds full vacuum with margin). Keep flames off the glass; the jar is the cold side.\n\njar  mouth  lid_dia_mm  band_od_mm  jar_od_mm  height_mm\nhalf-pint  regular  70  72  65  95\npint  regular  70  72  78  130\nquart  regular  70  72  90  175\npint  wide  86  88  86  125\nquart  wide  86  88  90  170\nhalf-gallon  wide  86  88  110  240\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- Wikipedia: Mason jar — web — CC BY-SA 4.0 (text) — https://en.wikipedia.org/wiki/Mason_jar\n- Ball (Newell Brands): Ball canning jars and lids — web — Ball site [verify license at link] — https://www.ballmasonjars.com/\n- Long Earth Society: Engine builds (videos and write-ups) — web, video — LES site — https://longearthsociety.com/engineering/\n\nXem Studio scan: not needed; this is a published standard. The sheet is the geometry.\nAPI: https://xemstudio.com/api/geometry?object=mason-jars-and-lids\n",
 "sources": [
  {
   "publisher": "Wikipedia",
   "title": "Mason jar",
   "url": "https://en.wikipedia.org/wiki/Mason_jar",
   "formats": [
    "web"
   ],
   "license": "CC BY-SA 4.0 (text)",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Ball (Newell Brands)",
   "title": "Ball canning jars and lids",
   "url": "https://www.ballmasonjars.com/",
   "formats": [
    "web"
   ],
   "license": "Ball site",
   "license_verified": false,
   "hosted": false
  },
  {
   "publisher": "Long Earth Society",
   "title": "Engine builds (videos and write-ups)",
   "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": [
  "rubber-stoppers-and-corks",
  "beverage-cans",
  "steel-food-cans",
  "o-rings-metric"
 ],
 "faq": [
  {
   "q": "What diameter is a regular mouth mason jar lid?",
   "a": "70 mm (2.75 in) flat lid; the band is 72 mm OD. Wide mouth is 86 mm with an 88 mm band."
  },
  {
   "q": "Can I 3D print a mason jar lid?",
   "a": "Print a Ø70 (or Ø86) × 2 mm disc and clamp it with the stock band; add a 1 mm silicone gasket for pressure or vacuum."
  }
 ],
 "files_license": null,
 "offers": [],
 "markdown": "https://xemstudio.com/objects/mason-jars-and-lids/index.md"
}