{
 "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-jar-lid",
 "name": "Mason jar flat lids: regular Ø70.00 and wide-mouth Ø86.00",
 "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",
  "found materials",
  "stirling",
  "long earth society"
 ],
 "aliases": [
  "mason jar lid diameter",
  "regular mouth lid size mm",
  "wide mouth lid diameter",
  "ball jar lid size mm"
 ],
 "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/mason-jar-lid/",
 "sheet_txt": "https://xemstudio.com/objects/mason-jar-lid/sheet.txt",
 "sheet": {
  "basis": "Regular 70 mm (2 3/4 in) and wide-mouth 86 mm (3 3/8 in) flat lids; 0.154 mm tinplate (GPI 450 metal closure spec, 0.00605 in minimum nominal)",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "Flat lids: regular mouth Ø70.00, wide mouth Ø86.00, both 0.154 mm thick. Each file is a plain disc at those sizes.",
   "Not drawn, because no dimension is published for it: the sealing-compound ring and the formed (embossed) profile.",
   "The lid sits on the jar's glass rim inside the band; the regular band's thread root is Ø71.22, so the Ø70.00 lid sits inside it."
  ],
  "table": {
   "columns": [
    "lid",
    "dia_mm",
    "thickness_mm"
   ],
   "rows": [
    [
     "regular mouth",
     70,
     0.154
    ],
    [
     "wide mouth",
     86,
     0.154
    ]
   ]
  }
 },
 "sheet_text": "Mason jar flat lids: regular Ø70.00 and wide-mouth Ø86.00 — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/mason-jar-lid/  (CC BY 4.0)\nBasis: Regular 70 mm (2 3/4 in) and wide-mouth 86 mm (3 3/8 in) flat lids; 0.154 mm tinplate (GPI 450 metal closure spec, 0.00605 in minimum nominal)\nCatalog version: 2026-10-20\n\nSizes: see table below\n- Flat lids: regular mouth Ø70.00, wide mouth Ø86.00, both 0.154 mm thick. Each file is a plain disc at those sizes.\n- Not drawn, because no dimension is published for it: the sealing-compound ring and the formed (embossed) profile.\n- The lid sits on the jar's glass rim inside the band; the regular band's thread root is Ø71.22, so the Ø70.00 lid sits inside it.\n\nlid  dia_mm  thickness_mm\nregular mouth  70.0  0.154\nwide mouth  86.0  0.154\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- Comet Tool Co.: 70-450 continuous-thread closure drawing (part 1340-0109): T 2.804 in at skirt, E 2.700 in at midpoint, 4 TPI (.250 pitch), 1 1/4 turns — PDF — manufacturer drawing [verify license at link] — https://www.comet-tool.com/wp-content/uploads/2021/08/70-450-0109-merged.pdf\n- WebstaurantStore (Ball 30000): Ball regular-mouth lids and bands: top diameter 2 3/4 in, height 9/16 in — web — listing [verify license at link] — https://www.webstaurantstore.com/ball-30000-regular-mouth-replacement-lids-and-bands-pack/52730000.html\n- WebstaurantStore (Ball 40000ZFP): Ball wide-mouth lids and bands: top diameter 3 3/8 in, height 5/8 in — web — listing [verify license at link] — https://www.webstaurantstore.com/ball-40000zfp-wide-mouth-lids-and-bands-for-canning-jars-pack/52740000.html\n- Healthy Canning: Lids for home canning: regular mouth 70 mm (2 3/4 in), wide mouth 86 mm (3 3/8 in) — web — site [verify license at link] — https://www.healthycanning.com/lids-for-home-canning/\n- The Cary Company: 70G-450 metal lid spec 30WG70 (GPI 450 finish; tinplate minimum nominal thickness .00605 in) — PDF — distributor spec [verify license at link] — https://www.thecarycompany.com/media/pdf/specs/30WG70.pdf\n- Long Earth Society: Engine builds (videos and write-ups) — 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/mason-jar-lid/index.json\nAPI: https://xemstudio.com/api/geometry?object=mason-jar-lid\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": "Comet Tool Co.",
   "title": "70-450 continuous-thread closure drawing (part 1340-0109): T 2.804 in at skirt, E 2.700 in at midpoint, 4 TPI (.250 pitch), 1 1/4 turns",
   "url": "https://www.comet-tool.com/wp-content/uploads/2021/08/70-450-0109-merged.pdf",
   "formats": [
    "PDF"
   ],
   "license": "manufacturer drawing",
   "license_verified": false,
   "hosted": false
  },
  {
   "publisher": "WebstaurantStore (Ball 30000)",
   "title": "Ball regular-mouth lids and bands: top diameter 2 3/4 in, height 9/16 in",
   "url": "https://www.webstaurantstore.com/ball-30000-regular-mouth-replacement-lids-and-bands-pack/52730000.html",
   "formats": [
    "web"
   ],
   "license": "listing",
   "license_verified": false,
   "hosted": false
  },
  {
   "publisher": "WebstaurantStore (Ball 40000ZFP)",
   "title": "Ball wide-mouth lids and bands: top diameter 3 3/8 in, height 5/8 in",
   "url": "https://www.webstaurantstore.com/ball-40000zfp-wide-mouth-lids-and-bands-for-canning-jars-pack/52740000.html",
   "formats": [
    "web"
   ],
   "license": "listing",
   "license_verified": false,
   "hosted": false
  },
  {
   "publisher": "Healthy Canning",
   "title": "Lids for home canning: regular mouth 70 mm (2 3/4 in), wide mouth 86 mm (3 3/8 in)",
   "url": "https://www.healthycanning.com/lids-for-home-canning/",
   "formats": [
    "web"
   ],
   "license": "site",
   "license_verified": false,
   "hosted": false
  },
  {
   "publisher": "The Cary Company",
   "title": "70G-450 metal lid spec 30WG70 (GPI 450 finish; tinplate minimum nominal thickness .00605 in)",
   "url": "https://www.thecarycompany.com/media/pdf/specs/30WG70.pdf",
   "formats": [
    "PDF"
   ],
   "license": "distributor spec",
   "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": [
  "mason-jar-band",
  "mason-jar",
  "rubber-stoppers",
  "o-rings-metric",
  "steel-food-cans"
 ],
 "fits": [
  {
   "role": "Goes in or on",
   "items": [
    {
     "slug": "mason-jar",
     "why": "sits on the jar's rim"
    }
   ]
  },
  {
   "role": "Connects to",
   "items": [
    {
     "slug": "mason-jar-band",
     "why": "the band clamps it to the rim"
    }
   ]
  }
 ],
 "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": "flat lid on jar mouth under the band",
   "exact": "Ø70.00 disc in Ø71.22 band thread root",
   "mates": "glass rim, clamped by the band",
   "fit": "clamp",
   "files": "mason-lid-flat-regular-70"
  },
  {
   "feature": "flat lid on jar mouth under the band",
   "exact": "Ø86.00 disc",
   "mates": "wide-mouth glass rim and band",
   "fit": "clamp",
   "files": "mason-lid-flat-wide-86"
  }
 ],
 "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 diameter is a regular mouth mason jar lid?",
   "a": "70.00 mm (2 3/4 in); a wide-mouth lid is 86.00 mm (3 3/8 in). Both are 0.154 mm tinplate."
  },
  {
   "q": "How thick is a mason jar lid?",
   "a": "0.154 mm (0.00605 in) tinplate, the minimum nominal thickness in the 70-450 metal closure spec."
  }
 ],
 "files_license": null,
 "offers": [
  {
   "file": "mason-lid-flat-regular-70",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/mason-jars-and-lids/mason-lid-flat-regular-70.step",
   "stl": "https://xemstudio.com/files/hardware/mason-jars-and-lids/mason-lid-flat-regular-70.stl",
   "note": "regular-mouth flat lid: Ø70.00 disc (2 3/4 in), 0.154 mm tinplate; sealing-compound ring and formed profile not drawn (no published dimensions)"
  },
  {
   "file": "mason-lid-flat-wide-86",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/mason-jars-and-lids/mason-lid-flat-wide-86.step",
   "stl": "https://xemstudio.com/files/hardware/mason-jars-and-lids/mason-lid-flat-wide-86.stl",
   "note": "wide-mouth flat lid: Ø86.00 disc (3 3/8 in), 0.154 mm tinplate; sealing-compound ring and formed profile not drawn (no published dimensions)"
  }
 ],
 "markdown": "https://xemstudio.com/objects/mason-jar-lid/index.md"
}