Apple AirTag dimensions: Ø31.9 × 8.0 mm, 11 g, holder STL — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/apple-airtag/  (CC BY 4.0)
Basis: Apple tech specs (1st and 2nd generation)
Catalog version: 2026-10-20

Overall (mm): length 31.9, width 31.9, height 8.0
- Ø31.9 mm (1.26 in), 8.0 mm (0.31 in) thick; 11 g (1st generation), 11.8 g (2nd generation, same size).
- Holders (free STL): pocket Ø32.2 × 8.2 with a 0.6 mm snap lip; print in PETG or TPU so the lip flexes. Keep metal away from the face for range.

generation  diameter_mm  thickness_mm  weight_g
AirTag (1st gen)  31.9  8.0  11.0
AirTag (2nd gen)  31.9  8.0  11.8

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- Apple Support: AirTag technical specifications — web — Publisher's page; dimensions are facts — https://support.apple.com/en-afri/111847
- Apple Support: AirTag (2nd generation) technical specifications — web — Publisher's page; dimensions are facts — https://support.apple.com/en-gb/126203

Free files (CC BY 4.0, Xem Studio; STEP + STL, 3 parts): https://xemstudio.com/files/hardware/apple-airtag/index.json
API: https://xemstudio.com/api/geometry?object=apple-airtag