# Kailh MX hot-swap socket (CPG151101S11): PCB footprint

> What PCB holes does a Kailh MX hot-swap socket need?

- Category: Computers & desk › Keyboard switches & stabilizers
- Kind: Standard part
- Basis: Kailh CPG151101S11 drawing rev B and specification KH-PS1607-10 (Recommended PCB Layout); MX switch holes from the KiCad Cherry MX footprint
- Page: https://xemstudio.com/objects/kailh-mx-hot-swap-socket-footprint/ · JSON: https://xemstudio.com/api/geometry?object=kailh-mx-hot-swap-socket-footprint · Plain text: https://xemstudio.com/objects/kailh-mx-hot-swap-socket-footprint/sheet.txt
- License: dimension sheet CC BY 4.0 (Xem Studio); files CC BY 4.0 or their publisher's license
- Use in every chat: add https://xemstudio.com/mcp as a connector (https://xemstudio.com/use-with-ai/)

**Exact dimensions.** True size, with no printing tolerance added.

## Notes

- The Kailh MX hot-swap socket (CPG151101S11) is soldered to the underside of the PCB so MX-style switches plug in and out without soldering. Its two contact sleeves sit in Ø3.05 holes on the switch's two contact pins; the switch's centre post and fixing pegs use the ordinary MX holes.
- Coordinates are seen from the keycap side, the same frame as the Cherry MX footprint page: origin on the stem axis, x to the right, y towards the contact pins. Kailh draws the layout from the socket side (the board's underside), which is this pattern mirrored left to right; the hole spacing (6.35 across, 2.54 up) matches the MX pin spacing exactly.
- Positions of the switch holes are from the KiCad Cherry MX footprint; the Ø3.05 socket holes and the socket body sizes are from Kailh's drawing. Kailh gives the solder pads only as reference sizes and does not place them, so the jig has no pads: take pad copper from your PCB tool's socket footprint.
- The file is a drill jig at true size: a ring round every hole joined by bars to the centre hole.

## Sizes

| parameter | value |
|---|---|
| switch centre post (x, y) | Ø4 at (+0.00, +0.00) mm |
| fixing peg (PCB-mount switches) (x, y) | Ø1.7 at (-5.08, +0.00) mm |
| fixing peg (PCB-mount switches) (x, y) | Ø1.7 at (+5.08, +0.00) mm |
| socket hole on contact pin 1 (x, y) | Ø3.05 at (+2.54, +5.08) mm |
| socket hole on contact pin 2 (x, y) | Ø3.05 at (-3.81, +2.54) mm |
| socket holes | Ø3.05 ± 0.05, 6.35 mm apart across and 2.54 mm apart up (the MX pin spacing) |
| PCB | single-sided board, T = 1.6 mm (Kailh's layout basis) |
| socket body length | 14.50 ± 0.15 mm |
| socket body height | 1.85 ± 0.1 mm |
| socket bosses (into the PCB holes) | Ø2.90 ± 0.05, 6.35 ± 0.1 apart |
| socket width at each contact | 5.89 ± 0.1 mm and 4.00 ± 0.1 mm; 10.90 ± 0.1 mm between the outer contact face and the narrow end |
| solder tabs | 2.55 × 2.5 mm pads, given by Kailh as reference sizes only (positions not dimensioned) |

## Where the files are

- Kailh (Kaihua Electronics): [CPG151101S11 MX hot-swap socket: drawing rev B and product specification KH-PS1607-10 (sec. 8 Recommended PCB Layout)](https://github.com/keyboardio/keyswitch_documentation/blob/master/datasheets/Kailh/CPG151101S11.pdf) — 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)](https://github.com/KiCad/kicad-footprints/tree/master/Button_Switch_Keyboard.pretty) — web — CC BY-SA 4.0 with KiCad exception (footprints)

## Free STEP/STL (1 parts, CC BY 4.0, Xem Studio)

Index: https://xemstudio.com/files/hardware/kailh-mx-hot-swap-socket-footprint/index.json

- mx-hot-swap-footprint-1u: [STEP](https://xemstudio.com/files/hardware/kailh-mx-hot-swap-socket-footprint/mx-hot-swap-footprint-1u.step) · [STL](https://xemstudio.com/files/hardware/kailh-mx-hot-swap-socket-footprint/mx-hot-swap-footprint-1u.stl) — MX hot-swap PCB hole pattern as a 1.6 mm drill jig: Ø4.0 centre, 2 × Ø1.7 pegs, 2 × Ø3.05 socket holes on the contact pins, true size

## Questions

**What size holes does a Kailh MX hot-swap socket need?**

Two Ø3.05 mm holes on the MX contact pins, 6.35 mm apart across and 2.54 mm apart up, plus the usual Ø4.0 centre hole (and Ø1.7 pegs for 5-pin switches).

**How big is the socket?**

14.50 mm long and 1.85 mm tall per Kailh's drawing.

## Fits with

- [Cherry MX switch: plate cutout and PCB footprint](https://xemstudio.com/objects/cherry-mx-switch-plate-cutout-and-pcb-footprint/)
- [Cherry MX PCB-mount stabilizer holes (2u, 2.25u, 2.75u, 6.25u)](https://xemstudio.com/objects/cherry-mx-pcb-mount-stabilizers/)
- [Kailh Choc v1 and v2 (PG1350 / PG1353): PCB footprint](https://xemstudio.com/objects/kailh-choc-v1-v2-pcb-footprint/)