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

What is the pin spacing of GU10 and GU5.3 light bulb bases? · Standard part · basis: Wikipedia Bi-pin lamp base table; numbers only

Also called: gu10 pin spacing, gu5.3 pin spacing, mr16 base dimensions, gu10 socket dimensions

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

sizes: 2 in table

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.

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

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

Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.

Wikipedia

Bi-pin lamp base

web

CC BY-SA; facts only

Xem scan

File coming

No downloadable true-size file yet: the published figures do not fix the whole shape, and Xem never guesses a number. A measured scan is planned; request it and it moves up.

Let your AI pull this. Add https://xemstudio.com/mcp to Claude, ChatGPT, Cursor or any MCP client (free, no account, one minute) and it can look up exact sizes, mating fits and free STEP/STL from every chat.

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Plain text: sheet.txt · JSON: /api/geometry?object=lamp-base-gu10-gu5-3

Schematic, not to scale.