Adafruit ADS1115 16-bit ADC breakout (1085, STEMMA QT): 25.4 × 17.78 mm board and mounting holes — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/adafruit-ads1115-1085/  (sheet CC BY 4.0)
Basis: Adafruit's Eagle board file for the ADS1115 STEMMA QT breakout and the JST SH connector datasheet.
Catalog version: 2026-10-20

Overall (mm): length 25.4, width 17.78, height 4.55
- Datum: board centred on X and Y, bottom on z=0, components up.
- Board 25.40 × 17.78 × 1.6 mm with R2.54 corners.
- Four Ø2.5 holes at (±10.16, ±6.35): a 20.32 × 12.70 mm pattern.
- Two side-entry JST SH 4-pin STEMMA QT connectors, each 4.25 × 6.10 × 2.95, centred at (±10.03, 0), openings facing outward; overall height 4.55.
- Not modelled: the two 1×6 headers along the ±Y edges (ship loose) and the ADC chip. The pre-2021 board (27.94 × 17.15, two holes) is a different part.
- Exact nominal mm.

hole  x (mm)  y (mm)  diameter (mm)
1  -10.16  -6.35  2.5
2  10.16  -6.35  2.5
3  -10.16  6.35  2.5
4  10.16  6.35  2.5

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- Adafruit: ADS1115 16-Bit ADC – 4 Channel with Programmable Gain Amplifier — web — Publisher's page; dimensions are facts — https://www.adafruit.com/product/1085
- Adafruit (GitHub): ADS1X15 Breakout Board PCB files — web — Publisher's page; dimensions are facts — https://github.com/adafruit/ADS1X15-Breakout-Board-PCBs
- Adafruit Learn: Adafruit 4-Channel ADC Breakouts — web — Publisher's page; dimensions are facts — https://learn.adafruit.com/adafruit-4-channel-adc-breakouts

Free files (CC BY 4.0, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/adafruit-ads1115-1085/index.json
API: https://xemstudio.com/api/geometry?object=adafruit-ads1115-1085