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Switch pins are the compatibility question that stops a build before it starts. You’ve found switches you like, and you need to know whether they’ll physically fit the board you own. For standard-height MX mechanical switches, the plastic legs decide physical fit, while the two metal contacts and the board’s switch technology decide whether a keypress can register.
⚡ Quick answer: For MX-style switches on an MX-style board, a 3-pin switch can mount in a compatible 3-pin or 5-pin PCB. A 5-pin switch needs the two extra PCB holes, or you may trim its two small plastic locating pegs. First confirm the board actually accepts standard-height MX mechanical switches; matching holes alone are not enough. This doesn’t apply to low-profile, optical or magnetic (Hall-effect) switches, which use their own sockets.
What the pins actually are
Turn an MX-style switch over and you’ll see two metal pins and one large plastic centre post. The metal pins are the electrical contacts that carry the signal. The plastic post locates the switch in the board. That’s a 3-pin switch, also called plate-mount, because on most boards a metal or plastic plate holds it straight.
A 5-pin switch, also called PCB-mount, adds two small plastic pegs, one on each side of the centre post. They carry no signal. They only steady the switch on the circuit board, which matters on plateless builds. The same switch is often sold in both versions, and the extra pegs do not change the switch’s electrical operation. Mounting support can still affect wobble in a plateless build.
Does this apply to your switches?
Everything on this page is about MX-style switches and MX-style boards. That covers most mechanical keyboards, but not all of them. Check which family your switches and board belong to first.
| Switch family | Examples | Fits an MX-style 3-pin or 5-pin board? |
|---|---|---|
| MX-style | Cherry MX, Gateron, Kailh BOX, Durock, Outemu, Akko and most enthusiast switches | Yes, following the rules on this page |
| Low-profile | Kailh Choc, Gateron low-profile | No. They use their own footprint and sockets |
| Optical | Optical switches from Gateron, Razer and others | No. They need matching optical sockets, which often differ between brands |
| Magnetic / Hall-effect | Switches for rapid-trigger boards | No. They need a magnetic-sensing board; there are no metal contact pins |
| Other designs | Topre, Alps, Cherry ULP | No. Different mechanisms and footprints entirely |
Look for the board manufacturer’s exact switch compatibility statement. “MX-compatible keycaps” only describes the cross-shaped stem on top; it does not establish that an MX mechanical switch fits the board’s PCB or socket.
Physical fit is not electrical compatibility
Pin count describes the underside of an MX-style mechanical switch. The two metal contacts must line up with a compatible mechanical socket or solder pads, and the board must be designed to read that switch. A cross-shaped keycap mount does not prove electrical compatibility. Optical and Hall-effect boards use different sensing methods; some low-profile mechanical switches use different footprints too. A 5-pin switch with its pegs removed still will not work in an incompatible switch family.
Before ordering, find the board’s exact model and revision, check whether your variant is hot-swappable, and read its supported switch families. Keychron’s switch compatibility guide illustrates why closely named boards can take different switches. Cherry’s MX2A Red datasheet separately identifies 3-pin frame mounting and 5-pin PCB locating versions.
Which combinations work (MX-style)
| Your switch | Your PCB or socket | Result |
|---|---|---|
| 3-pin | 3-pin | Fits |
| 3-pin | 5-pin | Fits; the two extra holes stay empty |
| 5-pin | 5-pin | Fits |
| 5-pin | 3-pin | Won’t sit flat until you clip the two plastic pegs |
How to tell what your board takes
- Confirm the exact board version first. A model may be sold as soldered, mechanical hot-swap, optical or magnetic. Find the model number and switch type in its manual. Then disconnect the keyboard and look at an empty switch position: remove one switch only if the manufacturer says it is hot-swappable, or inspect the PCB before a build. Every MX position has a large centre hole and two small holes for the metal pins. If there are also two small holes directly left and right of the centre hole, the board takes 5-pin.
- Check the listing and the socket. A clear board specification will say whether standard-height MX mechanical switches are supported and whether the PCB has the two locating holes. If a listing only says “3-pin”, confirm the socket family before deciding whether to trim a 5-pin switch.
- Test before blaming the switches. If a key stays dead after a swap, our PCB testing guide shows how to check whether the problem is the switch, the socket or the board.
How to clip 5-pin switches down to 3-pin
- Disconnect the keyboard. Confirm the switch is a standard-height MX mechanical model and the board has a plate to support a trimmed switch. Turn the switch over and identify the two small plastic pegs beside the centre post.
- Hold the switch over a tray, away from the metal contacts. Use flush cutters to remove one plastic peg at a time, close to the housing. Cut only the two locating pegs.
- Inspect the base for stubs, then align the two metal contacts with the correct socket holes. Support the PCB while pressing straight down; never force a switch. Reconnect the keyboard and test this one key before trimming the rest.
⚠️ Clipping limits. Never cut the two metal pins or the centre post: the switch won’t work, or won’t locate, without them. Leave any LED legs or light-pipe parts alone. Clipping can’t be undone and may affect a return, so clip one switch, test it in the board, then do the rest. On a plateless 5-pin board, clipped switches lose their extra support, so fit unclipped switches there if you can.
Do 5-pin switches feel more stable?
On a board with a plate, not noticeably. The plate already holds every switch firmly, so the two extra pegs have almost nothing left to do, and most people can’t feel or hear a difference. On a plateless board, the pegs earn their place. Without a plate, a switch is held only by its pins and centre post, and the pegs stop it twisting or tilting when you press near the edge of a key. That’s why 5-pin switches are the safer choice for plateless builds, and why clipped switches are best kept for boards with a plate.
Pin count doesn’t change how the switch itself sounds or feels. If keys rattle or wobble, the usual causes are loose keycaps, the stabilizers on longer keys, or a worn hot-swap socket, not missing pegs. Our stabilizer guide covers the most common of those.
Hot-swap boards
Hot-swap sockets grip the two metal pins, so the same rules apply: MX-style 3-pin switches fit any MX-style hot-swap board. Many hot-swap PCBs also have the extra holes for 5-pin switches, but budget boards sometimes skip them. Check the listing.
- Straighten pins first. Bent metal pins are the most common cause of a dead key after a swap. Check each switch and straighten any bent pin with tweezers.
- Support the socket. Press switches in straight, and on boards without a plate support the PCB from underneath so the socket isn’t pushed off the board.
- Check older budget boards. Some older budget hot-swap boards used sockets designed for a specific switch brand’s pins, and other switches can fit tightly or not at all. The product page or manual will say which switches are supported.
3-pin or 5-pin: which should you buy?
If your board takes both, 5-pin is the slightly better choice: the extra pegs help keep switches straight, especially on plateless builds. If you’re unsure what your board takes, or you want one set to move between boards, buy 3-pin, or buy 5-pin and clip when needed.
Either way, choose the switch for its feel first and the pin count second. Our best linear switches roundup covers typing and everyday use, and best linear switches for gaming covers weight and speed switches.
Frequently asked questions
Can I use 3-pin switches on a 5-pin board?
Yes, for MX-style switches and boards. The two metal pins and the centre post line up with the same holes, and the two extra holes for the plastic pegs simply stay empty. The switch works exactly the same.
Can I use 5-pin switches on a 3-pin board?
Usually, if both switch and board use the standard-height MX mechanical footprint. After checking the board, trim only the two small plastic pegs with flush cutters so the housing can sit flat. Don’t cut the metal pins or the centre post.
Does clipping the pegs damage the switch?
The plastic pegs carry no signal, so a cleanly clipped switch can operate like a 3-pin version in a compatible MX mechanical board. The change is permanent, and a plateless build may lose useful alignment support. The risks are cutting the wrong part, which can ruin the switch, and leaving a stub that stops it sitting flat.
Are 3-pin switches worse than 5-pin?
No. Feel, sound, actuation force and durability are the same. Makers often sell one switch in both versions. The pegs on 5-pin switches only help keep the switch straight on boards without a plate.
Can I mix 3-pin and 5-pin switches in one board?
Yes, on a board that accepts 5-pin. There’s no electrical difference, so mixing them is normal, for example when you replace a few switches from a different set.
Do 3-pin and 5-pin rules apply to low-profile or optical switches?
No. The rules on this page are for MX-style switches only. Low-profile switches such as Kailh Choc, optical switches and magnetic Hall-effect switches use different footprints or sockets, so check that the board specifically supports them.
Are 5-pin switches better for gaming?
No. Pin count doesn’t affect actuation, speed or how reliably a keypress registers, because the two plastic pegs carry no signal. For gaming, choose a switch for its weight and travel. 5-pin only helps on plateless boards, where it keeps switches straight.