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Alps SKCM / SKCL switch: plate cutout and PCB footprint
What size is the Alps switch plate cutout and where are its PCB holes? · Standard part · 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
Also called: alps plate cutout, alps switch cutout 15.5 x 12.8, skcm cutout, skcl footprint, alps pcb holes, matias plate cutout, alps switch dimensions, alps plate thickness
Exact dimensions. True size, with no printing tolerance added.
- length
- 19.05 mm
- width
- 19.05 mm
Notes
- 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.
Alps SKCM / SKCL switch: plate cutout and PCB footprint size chart
| 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 |
Where the files are
Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.
| Alps Alpine | SKCL/SKCM series push switch datasheet: mounting-panel hole drawing, panel t1.2, PCB mounting holes | web | Maker datasheet (linked, not rehosted) |
| 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) |
Free files
★ Free files 2 parts. Generated by Xem Studio from the standard; threads are plain cylinders at major diameter. CC BY 4.0. index.json
| alps-plate-1u | 1u plate square 19.05 × 19.05 × 1.2 mm with the 15.5 × 12.8 mm Alps switch cutout, true size | STEP · STL |
| alps-pcb-footprint | Alps SKCM/SKCL PCB holes as a 1.6 mm drill jig: 2 × Ø1.5, 5 mm apart, 4.5 and 4.0 mm above the key centre, true size | STEP · STL |
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.Plain text: sheet.txt · JSON: /api/geometry?object=alps-skcm-skcl-plate-cutout-and-pcb-footprint
Fits with
Questions
What size hole does an Alps switch need?
15.5 × 12.8 mm in a 1.2 mm plate (Alps SKCL/SKCM datasheet).
Where are the Alps switch pins?
Two Ø1.5 holes 5 mm apart: (+2.5, +4.5) and (−2.5, +4.0) mm from the key centre, seen from the mounting side.