Pot and pan lid sizes: how cookware is measured, lid knob M5 screw, replacement knob STL — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/cookware-lids-and-pans/  (CC BY 4.0)
Basis: Cookware maker's sizing guide (rim measurement, reference sizes); lid knob thread as listed by a replacement-knob seller; knob is a Xem Studio design
Catalog version: 2026-10-20

Sizes: see table below
- Pans and pots are sized by the top rim, wall top to wall top, rounded down: a '12 in' pan measures between 12 and 13 in. Measure your rim before buying a lid; the cooking surface is much smaller.
- Lids sit on or just inside the rim: a lid holder or rack slot for a nominal 28 cm lid wants about 290–300 mm of clearance.
- Lid knobs: replacement knobs are commonly sold with an M5 screw (M5 × 24 listed) that goes up through the lid. The printed knobs here take that screw into an M5 nut in a top pocket; use a heat-resistant filament (PETG is marginal near a hot lid, ASA/PC better) or keep them for cold-storage lids.

nominal  rim_in  rim_mm  cooking_surface_in
6 in  6.84  173.7  4.72
8 in  8.5  215.9  5.0
10 in  10.5  266.7  7.5
12 in  12.5  317.5  9.5
14 in  14.0  355.6  12.5

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- Made In Cookware: Frying pan sizes: how they are measured — web — Publisher's page; dimensions are facts — https://madeincookware.com/blogs/frying-pan-sizes
- Replacement knob listing (Walmart): Pot lid knob, M5 × 24 screw, Ø57 — web — Publisher's page; dimensions are facts — https://www.walmart.com/ip/383983328

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