Mason jar flat lids: regular Ø70.00 and wide-mouth Ø86.00 — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/mason-jar-lid/  (CC BY 4.0)
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)
Catalog version: 2026-10-20

Sizes: see table below
- 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.

lid  dia_mm  thickness_mm
regular mouth  70.0  0.154
wide mouth  86.0  0.154

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- Wikipedia: Mason jar — web — CC BY-SA 4.0 (text) — https://en.wikipedia.org/wiki/Mason_jar
- Ball (Newell Brands): Ball canning jars and lids — web — Ball site [verify license at link] — https://www.ballmasonjars.com/
- 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
- 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
- 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
- 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/
- 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
- Long Earth Society: Engine builds (videos and write-ups) — web, video — LES site — https://longearthsociety.com/engineering/

Free files (CC BY 4.0, Xem Studio; STEP + STL, 2 parts): https://xemstudio.com/files/hardware/mason-jar-lid/index.json
API: https://xemstudio.com/api/geometry?object=mason-jar-lid