Ball lock and pin lock keg posts and 5 gal Cornelius keg: post threads, wrench sizes, keg height and diameter — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/keg-posts-and-cornelius-kegs/  (sheet CC BY 4.0)
Basis: Published post-thread reference (HomebrewFinds), Wikipedia (Cornelius keg), retailer listings (Kegoutlet, Homebrewing.org); numbers only
Catalog version: 2026-10-20

Sizes: see table below
- 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.

keg / post  gas post thread (TPI 18)  liquid post thread (TPI 18)  post wrench (hex)
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  -

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- HomebrewFinds: Homebrew keg post thread size reference — web — Publisher's page; dimensions are facts — https://homebrewfinds.com/homebrew-keg-post-thread-size-reference
- 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/
- Wikipedia: Cornelius keg — web — Publisher's page; dimensions are facts — https://en.wikipedia.org/wiki/Cornelius_keg
- 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
- 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
- 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

No true-size file yet: the published figures do not fix the whole shape; a measured scan is planned.
API: https://xemstudio.com/api/geometry?object=keg-posts-and-cornelius-kegs