Adafruit 128×32 I2C OLED 0.91 in (931) — board outline, 4 × Ø2.5 holes, glass and STEMMA QT position — dimension sheet Source: Xem Studio, https://xemstudio.com/objects/adafruit-128x32-i2c-oled-931/ (sheet CC BY 4.0) 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. Catalog version: 2026-10-20 Overall (mm): length 33.02, width 21.59, height 6.0 - 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. 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 Files elsewhere (not hosted by Xem Studio; license as stated by the publisher): - Adafruit: Monochrome 128x32 I2C OLED graphic display (931) — web — Publisher's page; dimensions are facts — https://www.adafruit.com/product/931 - Adafruit (GitHub): Adafruit-128x32-I2C-OLED-Breakout-PCB (Eagle board files) — web — Publisher's page; dimensions are facts — https://github.com/adafruit/Adafruit-128x32-I2C-OLED-Breakout-PCB - Adafruit: Monochrome 0.91in 128x32 I2C OLED – STEMMA QT (4440), panel thickness — web — Publisher's page; dimensions are facts — https://www.adafruit.com/product/4440 - JST: SH connector 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-128x32-i2c-oled-931/index.json API: https://xemstudio.com/api/geometry?object=adafruit-128x32-i2c-oled-931