{
 "version": "2026-10-20",
 "license": "Dimension sheets: CC BY 4.0. Standard and published-size files: CC BY 4.0. Xem Studio's own designs (files_license = Xem Studio Design License): free to use and sell things from, not to redistribute as files — https://xemstudio.com/license/. Other publishers' files: their own license, linked beside them.",
 "slug": "keg-posts-and-cornelius-kegs",
 "name": "Ball lock and pin lock keg posts and 5 gal Cornelius keg: post threads, wrench sizes, keg height and diameter",
 "kind": "standard",
 "category": "Tri-clamp & pipe",
 "group": "Pipe, tube & threads",
 "year": null,
 "question": "What thread and wrench size is a ball lock keg post, and how big is a corny keg?",
 "tags": [
  "keg",
  "ball lock",
  "pin lock",
  "cornelius",
  "homebrew",
  "kegerator",
  "post",
  "thread",
  "tool"
 ],
 "aliases": [
  "ball lock post dimensions",
  "7/16-20 keg post",
  "keg post thread size",
  "corny keg dimensions",
  "cornelius keg size",
  "ball lock vs pin lock",
  "19/32-18 post",
  "keg post wrench size",
  "5 gallon corny keg height",
  "pin lock post thread"
 ],
 "overall_mm": {
  "length": null,
  "width": null,
  "height": null
 },
 "official_cad": false,
 "xem_status": "not-scanned",
 "les": false,
 "free_files": 0,
 "url": "https://xemstudio.com/objects/keg-posts-and-cornelius-kegs/",
 "sheet_txt": "https://xemstudio.com/objects/keg-posts-and-cornelius-kegs/sheet.txt",
 "sheet": {
  "basis": "Published post-thread reference (HomebrewFinds), Wikipedia (Cornelius keg), retailer listings (Kegoutlet, Homebrewing.org); numbers only",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "The common post thread is NOT 7/16-20. Cornelius and AEB kegs use 19/32-18 on both posts; Firestone and John Wood kegs usually use 9/16-18 (Wikipedia: Cornelius 19/32 in 18 TPI, Firestone/John Wood 9/16 in 18 TPI). 7/16-20 is the 1/4 in SAE flare / AN -4 thread, which is what a flare-nut gas or beer line screws onto; it is not the post.",
   "Two wrench sizes cover nearly all ball lock posts, 11/16 in and 7/8 in (6- or 12-point); pin lock posts take 13/16 in and need a notched socket.",
   "Ball lock and pin lock differ by the poppet and connector, not by the post thread: ball lock gas and liquid posts are the same thread and are told apart by the connector, pin lock by 2 pins (gas) or 3 pins (liquid).",
   "A 5 gal Cornelius-style ball lock keg is 8.5 in (216 mm) diameter and 25 in (635 mm) tall in maker listings; the pin lock is 9 in (229 mm) by 23 in (584 mm). Wikipedia lists 24.75 in for the ball lock and 8.5 in / 9 in diameters. Makers vary by about an inch, so measure your keg before building a kegerator.",
   "Not published by any maker we could read, so left out (no file): post outside diameter and height, poppet size, post o-ring sizes, lid opening. KegLand lists only a 20 mm long 1/4 in BSP tail on its welded post, and retail pages give no AS568 size for post o-rings."
  ],
  "table": {
   "columns": [
    "keg / post",
    "gas post thread (TPI 18)",
    "liquid post thread (TPI 18)",
    "post wrench (hex)"
   ],
   "rows": [
    [
     "Cornelius ball lock (Pepsi style)",
     "19/32-18",
     "19/32-18",
     "11/16 or 7/8 (6- or 12-point)"
    ],
    [
     "Cornelius pin lock (Coca-Cola style)",
     "19/32-18 (2 pin)",
     "19/32-18 (3 pin)",
     "13/16 (notched socket)"
    ],
    [
     "AEB ball lock",
     "19/32-18",
     "19/32-18",
     "same as Cornelius"
    ],
    [
     "Firestone / John Wood ball lock (V, VI, Super Challenger)",
     "9/16-18",
     "9/16-18",
     "-"
    ],
    [
     "Firestone / John Wood pin lock (A, R)",
     "9/16-18 (2 pin)",
     "9/16-18 (3 pin)",
     "-"
    ],
    [
     "Firestone Challenger (racetrack)",
     "11/16-18",
     "3/4-18",
     "-"
    ]
   ]
  }
 },
 "sheet_text": "Ball lock and pin lock keg posts and 5 gal Cornelius keg: post threads, wrench sizes, keg height and diameter — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/keg-posts-and-cornelius-kegs/  (sheet CC BY 4.0)\nBasis: Published post-thread reference (HomebrewFinds), Wikipedia (Cornelius keg), retailer listings (Kegoutlet, Homebrewing.org); numbers only\nCatalog version: 2026-10-20\n\nSizes: see table below\n- The common post thread is NOT 7/16-20. Cornelius and AEB kegs use 19/32-18 on both posts; Firestone and John Wood kegs usually use 9/16-18 (Wikipedia: Cornelius 19/32 in 18 TPI, Firestone/John Wood 9/16 in 18 TPI). 7/16-20 is the 1/4 in SAE flare / AN -4 thread, which is what a flare-nut gas or beer line screws onto; it is not the post.\n- Two wrench sizes cover nearly all ball lock posts, 11/16 in and 7/8 in (6- or 12-point); pin lock posts take 13/16 in and need a notched socket.\n- Ball lock and pin lock differ by the poppet and connector, not by the post thread: ball lock gas and liquid posts are the same thread and are told apart by the connector, pin lock by 2 pins (gas) or 3 pins (liquid).\n- A 5 gal Cornelius-style ball lock keg is 8.5 in (216 mm) diameter and 25 in (635 mm) tall in maker listings; the pin lock is 9 in (229 mm) by 23 in (584 mm). Wikipedia lists 24.75 in for the ball lock and 8.5 in / 9 in diameters. Makers vary by about an inch, so measure your keg before building a kegerator.\n- Not published by any maker we could read, so left out (no file): post outside diameter and height, poppet size, post o-ring sizes, lid opening. KegLand lists only a 20 mm long 1/4 in BSP tail on its welded post, and retail pages give no AS568 size for post o-rings.\n\nkeg / post  gas post thread (TPI 18)  liquid post thread (TPI 18)  post wrench (hex)\nCornelius ball lock (Pepsi style)  19/32-18  19/32-18  11/16 or 7/8 (6- or 12-point)\nCornelius pin lock (Coca-Cola style)  19/32-18 (2 pin)  19/32-18 (3 pin)  13/16 (notched socket)\nAEB ball lock  19/32-18  19/32-18  same as Cornelius\nFirestone / John Wood ball lock (V, VI, Super Challenger)  9/16-18  9/16-18  -\nFirestone / John Wood pin lock (A, R)  9/16-18 (2 pin)  9/16-18 (3 pin)  -\nFirestone Challenger (racetrack)  11/16-18  3/4-18  -\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- HomebrewFinds: Homebrew keg post thread size reference — web — Publisher's page; dimensions are facts — https://homebrewfinds.com/homebrew-keg-post-thread-size-reference\n- HomebrewFinds: Homebrew keg post sizes, ball lock and pin lock — web — Publisher's page; dimensions are facts — https://www.homebrewfinds.com/homebrew-keg-post-sizes-ball-lock-pin-locks/\n- Wikipedia: Cornelius keg — web — Publisher's page; dimensions are facts — https://en.wikipedia.org/wiki/Cornelius_keg\n- Kegoutlet: Cornelius kegs (ball lock 25 x 8.5 in, pin lock 23 x 9 in) — web — Publisher's page; dimensions are facts — https://www.kegoutlet.com/cornelius-kegs.html\n- Homebrewing.org (AIH): New 5 gallon corny keg, ball lock — web — Publisher's page; dimensions are facts — https://homebrewing.org/products/aih-new-5-gallon-corny-keg-ball-lock\n- KegLand: Ball lock post with 1/4 in bulkhead (20 mm thread) — web — Publisher's page; dimensions are facts — https://www.kegland.com.au/ball-lock-post-with-1-4-inch-bulkhead-assembly-gas.html\n\nNo true-size file yet: the published figures do not fix the whole shape; a measured scan is planned.\nAPI: https://xemstudio.com/api/geometry?object=keg-posts-and-cornelius-kegs\n",
 "sources": [
  {
   "publisher": "HomebrewFinds",
   "title": "Homebrew keg post thread size reference",
   "url": "https://homebrewfinds.com/homebrew-keg-post-thread-size-reference",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "HomebrewFinds",
   "title": "Homebrew keg post sizes, ball lock and pin lock",
   "url": "https://www.homebrewfinds.com/homebrew-keg-post-sizes-ball-lock-pin-locks/",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Wikipedia",
   "title": "Cornelius keg",
   "url": "https://en.wikipedia.org/wiki/Cornelius_keg",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Kegoutlet",
   "title": "Cornelius kegs (ball lock 25 x 8.5 in, pin lock 23 x 9 in)",
   "url": "https://www.kegoutlet.com/cornelius-kegs.html",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Homebrewing.org (AIH)",
   "title": "New 5 gallon corny keg, ball lock",
   "url": "https://homebrewing.org/products/aih-new-5-gallon-corny-keg-ball-lock",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "KegLand",
   "title": "Ball lock post with 1/4 in bulkhead (20 mm thread)",
   "url": "https://www.kegland.com.au/ball-lock-post-with-1-4-inch-bulkhead-assembly-gas.html",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  }
 ],
 "xem": {
  "status": "not-scanned",
  "sheet_free": true,
  "mesh_price_usd": null,
  "step_price_usd": null,
  "tolerance_mm": null
 },
 "related": [
  "push-fit-fittings",
  "as568-o-rings",
  "tri-clamp-hose-barb-adapters",
  "hose-barbs"
 ],
 "fits": [],
 "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": [],
 "faq": [
  {
   "q": "What size is a ball lock keg post thread?",
   "a": "19/32 in, 18 TPI on Cornelius and AEB kegs; 9/16 in, 18 TPI on most Firestone and John Wood kegs. It is not 7/16-20."
  },
  {
   "q": "How tall is a 5 gal ball lock keg?",
   "a": "About 25 in (635 mm) tall and 8.5 in (216 mm) in diameter in maker listings; Wikipedia gives 24.75 in."
  }
 ],
 "files_license": null,
 "offers": [],
 "markdown": "https://xemstudio.com/objects/keg-posts-and-cornelius-kegs/index.md"
}