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Adafruit SHT31-D temperature & humidity sensor (#2857, STEMMA QT): 25.4 × 17.78 mm board and 4 mounting holes
What are the Adafruit SHT31-D (product 2857) breakout dimensions and mounting-hole positions? · Modern device · basis: Adafruit's EagleCAD board file for the SHT31-D STEMMA QT breakout, with connector height from the JST SH datasheet.
Also called: Adafruit SHT31-D, Adafruit 2857, SHT31 breakout, SHT31-D Temperature & Humidity Sensor Breakout, Sensirion SHT31-D breakout, SHT31-D STEMMA QT
Exact dimensions. Every file is drawn at true size with no tolerance added. The holes and pins that meet another part are listed below under Mating features, with the fit each joint needs; open those by your process's clearance before making the part. Mating features
- length
- 25.4 mm
- width
- 17.78 mm
- height
- 4.55 mm
Notes
- 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.
Adafruit SHT31-D temperature & humidity sensor (#2857, STEMMA QT)… size chart
| 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 |
Mating features
Drawn at the exact size. Open press, slide, run and socket features by your process's clearance (tolerances by process); leave designed gaps and clamp fits as drawn.
| feature | exact | mates with | fit | files |
|---|---|---|---|---|
| Mounting holes | 2 × Ø2.50 + 2 × Ø2.54 on 20.32 × 12.70 | M2.5 or #2-56 screws and standoffs | designed | all |
| STEMMA QT connectors | 2 × JST SH 4-pin, 4.25 × 6.10, top 4.55, openings on both short edges | JST SH 4-pin cable plug; leave cable clearance past each short edge | designed | all |
Where the files are
Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.
| Adafruit | Sensirion SHT31-D Temperature & Humidity Sensor Breakout (#2857) | web | Publisher's page; dimensions are facts |
| Adafruit | Adafruit-SHT31-Sensor-Breakout-PCB repository | web | Publisher's page; dimensions are facts |
| Adafruit Learning System | Adafruit SHT31-D Temperature & Humidity Sensor Breakout guide | web | Publisher's page; dimensions are facts |
| JST | SH connector series datasheet | web | Publisher's page; dimensions are facts |
Free files
★ Free files 1 parts. Generated by Xem Studio from the standard; threads are plain cylinders at major diameter. CC BY 4.0. index.json
| adafruit-sht31-d-2857 | Adafruit SHT31-D temperature & humidity sensor (#2857, STEMMA QT): 25.4 × 17.78 mm board and 4 mounting holes | STEP · STL |
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.Plain text: sheet.txt · JSON: /api/geometry?object=adafruit-sht31-d-2857
Fits with
Questions
How big is the Adafruit SHT31-D breakout?
25.40 × 17.78 mm, 1.6 mm board (assumed), 4.55 mm tall over the STEMMA QT connectors.
Are all four mounting holes the same size?
No: two plated Ø2.50 holes on one long side and two unplated Ø2.54 on the other, all on a 20.32 × 12.70 mm rectangle.