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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? · 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.

Also called: adafruit 931, adafruit 128x32 oled, adafruit monochrome 128x32 i2c oled, 0.91 oled ssd1306, 128x32 oled dimensions, adafruit oled stemma qt 931, ug-2832hsweg02

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
33.02 mm
width
21.59 mm
height
6.0 mm

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.

Adafruit 128×32 I2C OLED 0.91 in (931) — board outline, 4 × Ø2.5… size chart

holex mmy mmdiameter mm
1-13.97-8.2552.5
213.97-8.2552.5
3-13.978.2552.5
413.978.2552.5

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.

featureexactmates withfitfiles
mounting holes4 × Ø2.5 on 27.94 × 16.51; PCB 33.02 × 21.59 × 1.6M2 screws or M2 standoffsdesignedall
display glass30.00 × 11.325 × 1.45, centred at (−0.78, +0.04) from the board centrefront-panel window openingdesignedall
STEMMA QT connectorJST SH 4-pin, 1.0 pitch, 2.95 tall under the PCB, opening to the −X edgeJST SH / Qwiic / STEMMA QT cabledesignedall

Where the files are

Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.

AdafruitMonochrome 128x32 I2C OLED graphic display (931)webPublisher's page; dimensions are facts
Adafruit (GitHub)Adafruit-128x32-I2C-OLED-Breakout-PCB (Eagle board files)webPublisher's page; dimensions are facts
AdafruitMonochrome 0.91in 128x32 I2C OLED – STEMMA QT (4440), panel thicknesswebPublisher's page; dimensions are facts
JSTSH connector datasheetwebPublisher'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-128x32-i2c-oled-931Adafruit 128×32 I2C OLED 0.91 in (931) — board outline, 4 × Ø2.5 holes, glass and STEMMA QT positionSTEP · STL
Let your AI pull this. Add 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.
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Plain text: sheet.txt · JSON: /api/geometry?object=adafruit-128x32-i2c-oled-931

Adafruit 128×32 I2C OLED 0.91 in (931) — board outline, 4 × Ø2.5 holes, glass and STEMMA QT position, isometric render of a generated part
Render of adafruit-128x32-i2c-oled-931 from the free STEP; not to scale.

Fits with

Adafruit displays: OLED, TFT, e-ink, 7-segment and matrix backpacks, isometric render of a generated part
Adafruit displays: OLED, TFT, e-ink, 7-segment and matrix backpacks20 sizes★ 20 files
Adafruit 0.96 in 128x64 OLED (STEMMA QT), isometric render of a generated part
Adafruit 0.96 in 128x64 OLED (STEMMA QT)29.21×31.75×6.2 mm★ 1 file
Character LCDs (1602, 2004), 128×64 graphic LCD, 0.96 in OLED, 7-segment displays, isometric render of a generated part
Character LCDs (1602, 2004), 128×64 graphic LCD, 0.96 in OLED, 7-segment displays12 sizes★ 12 files
opening
JST SH connector (1.0 mm pitch): wire, ratings, circuits8 sizes★ sheet
Adafruit STEMMA QT sensor breakouts (BME280, BNO055/085, VL53, SCD-40, AHT20, SHT40, IMUs, light, magnet, RTC…), isometric render of a generated part
Adafruit STEMMA QT sensor breakouts (BME280, BNO055/085, VL53, SCD-40, AHT20, SHT40, IMUs, light, magnet, RTC…)33 sizes★ 33 files
2.54 mm pin headers, 1×2 to 2×20, vertical and right-angle, isometric render of a generated part
2.54 mm pin headers, 1×2 to 2×20, vertical and right-angle30 sizes★ 30 files

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.