GU10 and GU5.3 (MR16) bi-pin lamp bases: pin spacing — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/lamp-base-gu10-gu5-3/  (sheet CC BY 4.0)
Basis: Wikipedia Bi-pin lamp base table; numbers only
Catalog version: 2026-10-20

Sizes: see table below
- 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.

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

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- Wikipedia: Bi-pin lamp base — web — CC BY-SA; facts only — https://en.wikipedia.org/wiki/Bi-pin_lamp_base

No true-size file yet: the published figures do not fix the whole shape; a measured scan is planned.
API: https://xemstudio.com/api/geometry?object=lamp-base-gu10-gu5-3