Adafruit SHT31-D temperature & humidity sensor (#2857, STEMMA QT): 25.4 × 17.78 mm board and 4 mounting holes — dimension sheet Source: Xem Studio, https://xemstudio.com/objects/adafruit-sht31-d-2857/ (sheet CC BY 4.0) Basis: Adafruit's EagleCAD board file for the SHT31-D STEMMA QT breakout, with connector height from the JST SH datasheet. Catalog version: 2026-10-20 Overall (mm): length 25.4, width 17.78, height 4.55 - Board 25.40 × 17.78 with R2.54 corners, centred, board bottom at 0; the header edge is −Y. Board thickness 1.6 is assumed (Adafruit's board file does not state it); everything else is from the board file. - Four mounting holes on a 20.32 × 12.70 rectangle: two plated Ø2.50 at (±10.16, +6.35) and two unplated Ø2.54 at (±10.16, −6.35). - Two STEMMA QT (JST SH 4-pin) connectors on the short edges, openings facing outward; 4.55 overall height. - Not modelled: the loose 1×7 0.1 in header along the −Y edge and the 2.5 × 2.5 SHT31 sensor; leave the sensor open to air. - This is the current STEMMA QT revision; older non-STEMMA SHT31-D boards may differ. - All dimensions are exact nominal millimetres, true size, with no tolerance added. hole x (mm) y (mm) diameter (mm) type 1 -10.16 -6.35 2.54 unplated 2 +10.16 -6.35 2.54 unplated 3 -10.16 +6.35 2.50 plated 4 +10.16 +6.35 2.50 plated Files elsewhere (not hosted by Xem Studio; license as stated by the publisher): - Adafruit: Sensirion SHT31-D Temperature & Humidity Sensor Breakout (#2857) — web — Publisher's page; dimensions are facts — https://www.adafruit.com/product/2857 - Adafruit: Adafruit-SHT31-Sensor-Breakout-PCB repository — web — Publisher's page; dimensions are facts — https://github.com/adafruit/Adafruit-SHT31-Sensor-Breakout-PCB - Adafruit Learning System: Adafruit SHT31-D Temperature & Humidity Sensor Breakout guide — web — Publisher's page; dimensions are facts — https://learn.adafruit.com/adafruit-sht31-d-temperature-and-humidity-sensor-breakout - JST: SH connector series datasheet — web — Publisher's page; dimensions are facts — https://www.jst-mfg.com/product/pdf/eng/eSH.pdf Free files (CC BY 4.0, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/adafruit-sht31-d-2857/index.json API: https://xemstudio.com/api/geometry?object=adafruit-sht31-d-2857