# Pot and pan lid sizes: how cookware is measured, lid knob M5 screw, replacement knob STL

> What size lid fits my pan?

- Category: Everyday objects › Kitchen
- Kind: Standard part
- 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
- Page: https://xemstudio.com/objects/cookware-lids-and-pans/ · JSON: https://xemstudio.com/api/geometry?object=cookware-lids-and-pans · Plain text: https://xemstudio.com/objects/cookware-lids-and-pans/sheet.txt
- License: dimension sheet CC BY 4.0 (Xem Studio); linked files under their publishers' licenses
- Use in every chat: add https://xemstudio.com/mcp as a connector (https://xemstudio.com/use-with-ai/)

**Exact dimensions.** True size, with no printing tolerance added.

## Notes

- 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.

## Sizes

| 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 |

## Where the files are

- Made In Cookware: [Frying pan sizes: how they are measured](https://madeincookware.com/blogs/frying-pan-sizes) — web — Publisher's page; dimensions are facts
- Replacement knob listing (Walmart): [Pot lid knob, M5 × 24 screw, Ø57](https://www.walmart.com/ip/383983328) — web — Publisher's page; dimensions are facts

## Free STEP/STL (2 parts, CC BY 4.0, Xem Studio)

Index: https://xemstudio.com/files/hardware/cookware-lids-and-pans/index.json

- lid-knob-m5-35mm: [STEP](https://xemstudio.com/files/hardware/cookware-lids-and-pans/lid-knob-m5-35mm.step) · [STL](https://xemstudio.com/files/hardware/cookware-lids-and-pans/lid-knob-m5-35mm.stl) — Replacement pot-lid knob Ø35, M5 screw from inside the lid into an M5 nut in the knob's top pocket
- lid-knob-m5-45mm: [STEP](https://xemstudio.com/files/hardware/cookware-lids-and-pans/lid-knob-m5-45mm.step) · [STL](https://xemstudio.com/files/hardware/cookware-lids-and-pans/lid-knob-m5-45mm.stl) — Replacement pot-lid knob Ø45, M5 screw from inside the lid into an M5 nut in the knob's top pocket

## Questions

**How are frying pans measured?**

Across the top rim, wall top to wall top, rounded down to the nominal size.

**What screw holds a pot lid knob?**

Replacement knobs are commonly M5 (M5 × 24 listed).

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