Are All Mechanical Keyboard Switches Universal?

If you want to buy new switches for a mechanical keyboard, it can sometimes seem like you can simply put any switch into any keyboard.

After all, many switches look almost identical.

But are all mechanical keyboard switches universal?

No. Many standard MX-style switches are interchangeable, but not all keyboard switches use the same dimensions, mounting, electrical connection or technology.

Quick explanation

Many traditional MX-style mechanical switches are interchangeable if the keyboard supports the same footprint and mounting. But low-profile, optical, Hall Effect and proprietary switches can use completely different connections. Always check the switch type, PCB, 3-pin/5-pin support and hot-swap compatibility.

1. What does “universal” mean for keyboard switches?

Universal usually means that a switch:

• physically fits in the keyboard;
• works electrically;
• is supported by the PCB;
• can be used with the keycaps.

A switch may look the same from the top but still use a different connection underneath.

2. Are MX-style switches universal?

Many MX-style mechanical switches use a very similar standard.

Brands such as Cherry, Gateron, Kailh, TTC, HMX and many other manufacturers produce switches with an MX-like shape.

These switches are often interchangeable when the keyboard supports standard MX-style switches.

3. What does MX-style mean?

MX-style refers to switches that are largely based on the Cherry MX format.

Typical characteristics include:

• a cross-shaped stem for MX-compatible keycaps;
• a similar switch housing;
• two metal electrical contact pins on traditional mechanical versions;
• 3-pin or 5-pin mounting.

4. Does the same stem mean switches are compatible?

No.

A cross-shaped MX stem mainly tells you about keycap compatibility.

It does not automatically mean that the bottom of the switch also works with your PCB.

Two switches can use the same keycaps while still not being electrically or physically interchangeable.

5. Are Cherry MX and Gateron switches interchangeable?

With standard MX-style mechanical versions, usually yes.

If your keyboard supports normal MX-style mechanical switches, many Cherry MX and Gateron switches can use the same basic footprint.

You still need to check whether your PCB supports 3-pin or 5-pin switches.

6. Are Kailh switches compatible with MX keyboards?

Many standard Kailh MX-style switches are.

For example, many Kailh BOX switches use an MX-compatible footprint and MX-style keycap stem.

However, not every Kailh switch system is the same.

Kailh also makes low-profile switches with a different footprint.

7. Are TTC, HMX and other brands compatible?

Many standard mechanical MX-style switches from these brands are compatible with normal MX-style keyboards.

The brand itself therefore does not automatically determine compatibility.

The actual switch technology and footprint matter more.

8. What is the difference between 3-pin and 5-pin?

With traditional MX-style switches, this refers to the mounting on the bottom.

A 3-pin switch has:

• 1 central plastic mounting pin;
• 2 metal electrical pins.

A 5-pin switch adds two additional plastic stabilizing pins.

Read our full explanation: What Are 3-Pin and 5-Pin Keyboard Switches?

9. Does a 3-pin switch fit in a 5-pin keyboard?

Usually yes.

The two additional holes for the stabilizing pins simply remain unused.

10. Does a 5-pin switch fit in a 3-pin keyboard?

Not directly.

The two additional plastic stabilizing pins do not have holes in a 3-pin PCB.

With standard MX-style switches, these pins can usually be carefully clipped off.

Also read: Can You Put 5-Pin Switches in a 3-Pin Keyboard?

11. Are all hot-swap switches universal?

No.

Hot-swap only means that you can replace switches without soldering.

It does not automatically tell you which type of switch the socket supports.

A hot-swap keyboard may, for example, be designed for:

• standard MX-style mechanical switches;
• optical switches;
• Hall Effect switches;
• low-profile switches;
• a proprietary system.

12. Are all MX hot-swap sockets the same?

Not always.

Many regular MX-style hot-swap sockets accept the same two metal switch contacts.

However, the PCB can still have limitations because of:

• 3-pin versus 5-pin mounting;
• plate design;
• LED positioning;
• switch housing dimensions;
• other physical components around the socket.

13. Are optical switches universal with mechanical switches?

No.

Optical switches work differently from traditional mechanical contact switches.

They use light detection instead of the same metal electrical contact method.

That is why you normally cannot simply use a standard mechanical MX switch in an optical keyboard.

14. Can optical switches be swapped with each other?

Not always.

Even within optical systems, different manufacturers can use different housings, stems, light paths or PCB layouts.

Always check which optical switch family the keyboard supports.

15. Are Hall Effect switches universal?

No.

Hall Effect switches use magnets and sensors instead of traditional metal contact points.

The physical shape can sometimes look very similar to a normal MX-style switch, but the operating principle is completely different.

16. Can you put any Hall Effect switch in any HE keyboard?

Not automatically.

Compatibility can depend on:

• the position of the magnet;
• the strength of the magnet;
• the height of the magnet during the keypress;
• the physical footprint;
• the sensor position on the PCB;
• firmware and calibration.

Always check which HE switches are officially or physically supported.

17. Can you use Hall Effect switches in a normal mechanical keyboard?

Normally not.

A traditional mechanical keyboard expects electrical contact points.

A Hall Effect switch uses a magnet that is measured by a sensor on the PCB.

The technologies are therefore not directly interchangeable.

18. Are low-profile switches universal?

No.

Low-profile switches are shorter than standard MX-style switches and often use a different footprint.

They can also differ in:

• stem;
• mounting;
• electrical pins;
• overall height;
• keycap compatibility.

19. Can you use low-profile switches in a normal MX keyboard?

In most cases, no.

The PCB, plate and switch height are designed for a different format.

Even if parts of the switch look similar, that does not mean they physically or electrically fit.

20. Are all low-profile switches interchangeable?

No.

Different low-profile families can use different footprints.

You therefore need to check specifically which switch family your keyboard supports.

21. What are proprietary switches?

Proprietary switches are switches designed for a specific brand, keyboard or ecosystem.

They can differ in:

• housing;
• pin layout;
• stem;
• electrical operation;
• mounting;
• firmware support.

These switches are often less widely interchangeable.

22. Are soldered keyboards more compatible than hot-swap keyboards?

Not necessarily.

A soldered PCB can still be designed for a specific switch footprint.

The main advantage is that there is no hot-swap socket adding extra physical limitations.

But you still need to check whether the switch fits electrically and mechanically.

23. Does north-facing or south-facing LED positioning matter?

Sometimes.

The electrical switch compatibility may be the same, but LED position can affect:

• space around the housing;
• RGB light transmission;
• compatibility with certain keycap profiles.

This does not mean north-facing and south-facing keyboards require completely different switches, but it can affect practical compatibility.

24. Are switches with transparent housings more universal?

No.

A transparent housing mainly tells you about light transmission and appearance.

It says nothing about the electrical or mechanical footprint.

25. Are SMD-compatible switches different?

SMD-compatible usually refers to space or transparency for LEDs mounted on the PCB.

Many modern MX-style switches are SMD-compatible.

However, this is still different from whether the switch physically and electrically fits the keyboard.

26. Are keycaps universal between all switches?

No.

Many standard MX-style switches use a cross-shaped stem and support the same type of keycaps.

Other switch families can use a different stem.

With keycaps, you also need to consider:

• keyboard layout;
• keycap sizes;
• stabilizer layout;
• keycap profile;
• low-profile versus standard height.

27. Can switches physically fit but still not work?

Yes.

Physical fit is only one part of compatibility.

A switch may, for example:

• fit through the plate;
• have the same stem;
• have roughly the same housing dimensions;

but still use a different electrical or magnetic technology.

28. Can switches work electrically but not fit properly physically?

That can also happen.

A PCB may support the same electrical contact points while:

• the additional 5-pin support pins have no holes;
• the plate opening is not suitable;
• a housing touches another component;
• the LED layout limits available space.

29. How do you check switch compatibility?

At minimum, check:

1. Is it a mechanical, optical or Hall Effect switch?
2. Does the keyboard use the same technology?
3. Is the footprint MX-style or another format?
4. Does the PCB support 3-pin or 5-pin?
5. Does the switch fit through the plate?
6. Is the keyboard hot-swap or soldered?
7. Does the manufacturer list specific compatible switch families?

30. What is the safest choice for a normal MX hot-swap keyboard?

If your keyboard explicitly supports standard MX-style mechanical switches, you usually have the widest selection.

You can then often choose from many:

• linear switches;
• tactile switches;
• clicky switches.

You should still check 3-pin/5-pin support.

31. What if the product page only says “MX-compatible”?

Check what is meant by that.

MX-compatible can sometimes refer to:

• the keycap stem;
• the complete switch footprint;
• only certain physical dimensions.

Do not rely on that single term if PCB compatibility is unclear.

32. Which switch types are usually not interchangeable?

Switch type	Universal with standard mechanical MX?
Standard MX-style mechanical	Often yes, depending on 3/5-pin
Low-profile	Usually not
Optical	No
Hall Effect	No
Proprietary	Often not

33. What if you buy the wrong switches?

Do not force them into the keyboard.

First check why they do not fit.

Possible causes include:

• 5-pin switch on a 3-pin PCB;
• wrong switch technology;
• low-profile versus standard MX;
• wrong proprietary footprint;
• bent electrical pins;
• plate incompatibility.

34. Are linear, tactile and clicky switches interchangeable?

If they all use the same standard MX-style footprint, usually yes.

The internal switch type does not automatically change the connection.

In many normal MX-style keyboards, you can therefore mix linear, tactile and clicky switches as long as the footprint is compatible.

35. Common mistakes

• Thinking every switch with an MX stem automatically fits every MX keyboard.
• Treating optical switches like normal mechanical switches.
• Trying to put Hall Effect switches into a traditional mechanical PCB.
• Confusing low-profile and standard-height switches.
• Not checking 3-pin and 5-pin support.
• Assuming hot-swap automatically means every switch fits.

Conclusion

No, not all mechanical keyboard switches are universal.

Many standard MX-style mechanical switches are compatible with each other and can be swapped between different keyboards and brands.

But compatibility depends on more than just the appearance of the switch.

Always check switch technology, footprint, 3-pin/5-pin support, PCB, plate and hot-swap system.

Low-profile, optical, Hall Effect and proprietary switches in particular should be treated as separate systems.

If your keyboard supports standard MX-style mechanical switches, you usually have the widest choice of brands and switch types.