# GU10 and GU5.3 (MR16) bi-pin lamp bases: pin spacing

> What is the pin spacing of GU10 and GU5.3 light bulb bases?

- Category: Home & kitchen › Household
- Kind: Standard part
- Basis: Wikipedia Bi-pin lamp base table; numbers only
- Page: https://xemstudio.com/objects/lamp-base-gu10-gu5-3/ · JSON: https://xemstudio.com/api/geometry?object=lamp-base-gu10-gu5-3 · Plain text: https://xemstudio.com/objects/lamp-base-gu10-gu5-3/sheet.txt
- License: dimension sheet CC BY 4.0 (Xem Studio); files CC BY 4.0 or their publisher's license
- 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

- GU5.3 (MR16) pins are 5.33 mm apart, pin diameter 1.45 to 1.6 mm. GU10 pins are 10 mm apart (twist-lock).
- No file: pin length, GU10 pin head size and the base outline are not published on a page available to Xem, and a pair of holes alone would not be a base. The GU10 pin diameter in the source table is ambiguous, so it is left out.

## Sizes

| base | pin spacing | pin diameter |
|---|---|---|
| GU5.3 / G5.3 (MR16) | 5.33 mm | 1.45 to 1.6 mm (G5.3: 1.47 to 1.65 mm) |
| GU10 | 10 mm | not confirmed |

## Where the files are

- Wikipedia: [Bi-pin lamp base](https://en.wikipedia.org/wiki/Bi-pin_lamp_base) — web — CC BY-SA; facts only

## Questions

**How far apart are GU10 pins?**

10 mm.

**How far apart are MR16 GU5.3 pins?**

5.33 mm.

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