Arduino Uno R3 — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/arduino-uno-r3/  (CC BY 4.0)
Basis: published board outline
Catalog version: 2026-10-20

Overall (mm): length 68.6, width 53.4
Mounting holes: 4 × Ø3.2 mm, pattern see official outline; holes are not on a rectangular grid, screw M3
- USB-B and DC barrel jack on the same short edge.
- Shield header spacing is the Uno standard (one 0.16 in offset).

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- Arduino (official): UNO R3 documentation, CAD files — STEP, DXF, PDF — see page [verify license at link] — https://docs.arduino.cc/hardware/uno-rev3/

Xem Studio scan: not planned; the official CAD above covers it.
API: https://xemstudio.com/api/geometry?object=arduino-uno-r3