Alps SKCM / SKCL switch: plate cutout and PCB footprint — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/alps-skcm-skcl-plate-cutout-and-pcb-footprint/  (sheet CC BY 4.0)
Basis: Alps SKCL/SKCM datasheet (mounting-panel hole drawing, panel t1.2, PCB mounting holes); key pitch and pin split from the KiCad SW_Matias_1.00u footprint
Catalog version: 2026-10-20

Overall (mm): length 19.05, width 19.05
- Alps SKCM / SKCL ('complicated' and 'simplified' Alps) switches and their clones (Matias, many vintage boards) clip into a 15.5 × 12.8 mm rectangular plate hole in a 1.2 mm plate, wider than tall, and have two Ø1.5 pins.
- Holes are seen from the switch mounting side, origin on the key centre, x to the right, y up: the pins are 5 mm apart, pin 1 at 4.5 mm and pin 2 at 4.0 mm above the key centre. Alps dimensions the 5 mm spacing; the ±2.5 split about the key centre is confirmed by the KiCad Matias/Alps footprint.
- The plate tile is the 19.05 mm key footprint; the cutout is at true size with square corners as Alps draws it.

parameter  value
plate (panel) cutout  15.5 × 12.8 mm (15.5 across, 12.8 up)
plate thickness  t1.2 mm
pin 1 (x, y)  Ø1.5 at (+2.5, +4.5) mm
pin 2 (x, y)  Ø1.5 at (-2.5, +4.0) mm
key pitch (1u)  19.05 mm

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- Alps Alpine: SKCL/SKCM series push switch datasheet: mounting-panel hole drawing, panel t1.2, PCB mounting holes — web — Maker datasheet (linked, not rehosted) — https://github.com/keyboardio/keyswitch_documentation/blob/master/datasheets/ALPS/SKCL.pdf
- KiCad: kicad-footprints: Button_Switch_Keyboard.pretty (SW_Cherry_MX_1.00u_PCB fixing pegs; SW_Matias_1.00u Alps-type pin positions) — web — CC BY-SA 4.0 with KiCad exception (footprints) — https://github.com/KiCad/kicad-footprints/tree/master/Button_Switch_Keyboard.pretty

Free files (CC BY 4.0, Xem Studio; STEP + STL, 2 parts): https://xemstudio.com/files/hardware/alps-skcm-skcl-plate-cutout-and-pcb-footprint/index.json
API: https://xemstudio.com/api/geometry?object=alps-skcm-skcl-plate-cutout-and-pcb-footprint