# Adafruit 128×32 I2C OLED 0.91 in (931) — board outline, 4 × Ø2.5 holes, glass and STEMMA QT position

> What are the Adafruit 128×32 I2C OLED (931) dimensions, hole positions and display window?

- Category: Electronic components › Modules, sensors & displays
- Kind: Modern device
- Basis: Adafruit's Eagle board file for the 128x32 I2C OLED STEMMA QT rev B (GitHub), panel thickness from the Adafruit 4440 page and JST SH height from JST's datasheet.
- Page: https://xemstudio.com/objects/adafruit-128x32-i2c-oled-931/ · JSON: https://xemstudio.com/api/geometry?object=adafruit-128x32-i2c-oled-931 · Plain text: https://xemstudio.com/objects/adafruit-128x32-i2c-oled-931/sheet.txt
- License: dimension sheet CC BY 4.0 (Xem Studio); files CC BY 4.0 or their publisher's license
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## Overall (mm)

| length | width | height |
|---|---|---|
| 33.02 | 21.59 | 6.0 |

**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.

## Notes

- Exact nominal dimensions. Display side up. PCB 33.02 × 21.59 × 1.6 mm, R2.54 corners; datum is the board centre; the PCB sits 2.95–4.55 mm above the base so the connector under it rests on z=0.
- Four plated mounting holes Ø2.5 at (±13.97, ±8.255): a 27.94 × 16.51 mm pattern.
- Display glass 30.00 × 11.325 × 1.45 mm on top of the PCB, centred at (−0.78, +0.04); top of glass 6.0 mm overall.
- STEMMA QT (JST SH 4-pin) under the PCB: 4.25 × 6.10 × 2.95 mm, centred at (−13.80, +0.30), opening facing the −X edge. 6-pin 0.1 in header row along the −Y edge.
- Not modelled: the 1×6 header (ships loose), the flex tail wrapped under the edge and SMD parts. Adafruit 4440 is a different 35 × 20 mm board.

## Mating features (exact size; open press / slide / run / socket by your process clearance, leave designed and clamp as drawn)

| feature | exact | mates with | fit | files |
|---|---|---|---|---|
| mounting holes | 4 × Ø2.5 on 27.94 × 16.51; PCB 33.02 × 21.59 × 1.6 | M2 screws or M2 standoffs | designed | all |
| display glass | 30.00 × 11.325 × 1.45, centred at (−0.78, +0.04) from the board centre | front-panel window opening | designed | all |
| STEMMA QT connector | JST SH 4-pin, 1.0 pitch, 2.95 tall under the PCB, opening to the −X edge | JST SH / Qwiic / STEMMA QT cable | designed | all |

## Sizes

| hole | x mm | y mm | diameter mm |
|---|---|---|---|
| 1 | -13.97 | -8.255 | 2.5 |
| 2 | 13.97 | -8.255 | 2.5 |
| 3 | -13.97 | 8.255 | 2.5 |
| 4 | 13.97 | 8.255 | 2.5 |

## Where the files are

- Adafruit: [Monochrome 128x32 I2C OLED graphic display (931)](https://www.adafruit.com/product/931) — web — Publisher's page; dimensions are facts
- Adafruit (GitHub): [Adafruit-128x32-I2C-OLED-Breakout-PCB (Eagle board files)](https://github.com/adafruit/Adafruit-128x32-I2C-OLED-Breakout-PCB) — web — Publisher's page; dimensions are facts
- Adafruit: [Monochrome 0.91in 128x32 I2C OLED – STEMMA QT (4440), panel thickness](https://www.adafruit.com/product/4440) — web — Publisher's page; dimensions are facts
- JST: [SH connector datasheet](https://www.jst-mfg.com/product/pdf/eng/eSH.pdf) — web — Publisher's page; dimensions are facts

## Free STEP/STL (1 parts, CC BY 4.0, Xem Studio)

Index: https://xemstudio.com/files/hardware/adafruit-128x32-i2c-oled-931/index.json

- adafruit-128x32-i2c-oled-931: [STEP](https://xemstudio.com/files/hardware/adafruit-128x32-i2c-oled-931/adafruit-128x32-i2c-oled-931.step) · [STL](https://xemstudio.com/files/hardware/adafruit-128x32-i2c-oled-931/adafruit-128x32-i2c-oled-931.stl) — Adafruit 128×32 I2C OLED 0.91 in (931) — board outline, 4 × Ø2.5 holes, glass and STEMMA QT position

## Questions

**How big is the Adafruit 128x32 OLED board?**

33.02 × 21.59 mm, 1.6 mm PCB; 6.0 mm overall from the connector underneath to the top of the glass.

**What is the hole pattern?**

Four Ø2.5 mm holes on a 27.94 × 16.51 mm rectangle; use M2 screws.

**How big is the display glass?**

30.00 × 11.325 × 1.45 mm, centred 0.78 mm off the board centre along the long axis.

## Fits with

- [Adafruit displays: OLED, TFT, e-ink, 7-segment and matrix backpacks](https://xemstudio.com/objects/adafruit-displays/)
- [Adafruit 0.96 in 128x64 OLED (STEMMA QT)](https://xemstudio.com/objects/adafruit-0-96-in-128x64-oled-stemma-qt/)
- [Character LCDs (1602, 2004), 128×64 graphic LCD, 0.96 in OLED, 7-segment displays](https://xemstudio.com/objects/lcd-oled-displays/)
- [JST SH connector (1.0 mm pitch): wire, ratings, circuits](https://xemstudio.com/objects/jst-sh-connector/)
- [Adafruit STEMMA QT sensor breakouts (BME280, BNO055/085, VL53, SCD-40, AHT20, SHT40, IMUs, light, magnet, RTC…)](https://xemstudio.com/objects/adafruit-stemma-qt-breakouts/)
- [2.54 mm pin headers, 1×2 to 2×20, vertical and right-angle](https://xemstudio.com/objects/pin-headers-2.54mm/)