A keyboard is made up of several parts that work together to register keystrokes, support the keys, and shape the typing experience. Whether you are replacing a worn component, choosing a new mechanical keyboard, or planning a custom build, understanding these parts makes it easier to compare options and avoid compatibility problems.
The Main Parts of a Keyboard
Most keyboards combine electrical, mechanical, and structural components. The exact design varies between membrane, mechanical, and custom keyboards, but the main parts commonly include:
- Keycaps: The removable covers touched by your fingers.
- Switches: The mechanisms that detect key presses in a mechanical keyboard.
- Stabilizers: Supports that keep longer keys moving evenly.
- PCB: The printed circuit board that registers presses and sends signals to the computer.
- Plate: A supporting layer that holds switches in position and adds rigidity.
- Case: The outer shell that protects the internal parts and influences weight and sound.
- Mounting and dampening parts: Gaskets, foam, pads, screws, and related pieces that affect flex, noise, and assembly.
Keycaps
Keycaps determine much of a keyboard’s appearance, but they also influence texture, key travel, and finger position. ABS and PBT are two common plastics. Their surface feel and how they change with heavy use can differ, so material is worth considering when selecting replacement keycaps.
Keycap profile is another important choice. Profiles such as OEM, Cherry, and SA use different shapes and heights. Some sets have sculpted rows, while uniform sets use a similar shape across the keyboard. A replacement set must match the keyboard’s layout and should be compatible with the switch stem, usually the cross-shaped mount found on many mechanical switches.
Mechanical Switches
Mechanical switches sit beneath the keycaps and control the feel and sound of each press. Their internal parts typically include a housing, stem, and spring. The stem moves when a key is pressed, while the spring provides resistance and returns the key toward its original position.
Switches are generally grouped by their behavior:
- Linear switches: Move smoothly without a deliberate bump.
- Tactile switches: Provide a noticeable bump during the press.
- Clicky switches: Combine tactile feedback with an audible click.
The best choice depends on personal preference and surroundings. Quiet operation may be more important in a shared office, while a typist may prefer tactile feedback. Gamers and other users may favor the consistent movement of a linear switch.
A hot-swap PCB allows compatible switches to be removed and replaced without soldering. With a soldered PCB, switches are attached more permanently and require soldering equipment for replacement. Enthusiasts may also modify switches by changing springs, lubricating moving parts, or using switch films, but these tasks require care and suitable tools.
Stabilizers for Larger Keys
Long keys such as the spacebar, Enter, Backspace, and Shift need additional support. Stabilizers connect the keycap across its length so it does not rock excessively or press unevenly. Common designs include plate-mounted and PCB-mounted stabilizers.
Stabilizer compatibility depends on the PCB, plate, keycap set, and keyboard layout. Correct installation and tuning can reduce wobble, unwanted noise, and inconsistent movement. A stabilizer or layout mismatch can prevent a keycap from fitting correctly even when the switches themselves are compatible.
PCBs, Plates, and Cases
The PCB is the keyboard’s electrical foundation. It detects key presses and connects the switches to the computer through the board’s controller and connector. Some PCBs support programmable firmware, allowing users to remap keys or create macros. Layout support is especially important: a 60% PCB, for example, must match a compatible case, plate, stabilizer arrangement, and keycap layout.
The plate sits above or around the PCB and holds the switches in place. Aluminum, brass, stainless steel, and polycarbonate plates can produce different levels of rigidity and contribute to the keyboard’s sound and feel.
The case surrounds the assembly. Plastic, aluminum, and acrylic cases vary in weight, appearance, durability, and acoustic behavior. Mounting styles—including tray mount, top mount, and gasket mount—describe how the plate or PCB is attached to the case. These arrangements can change how much the board flexes and how vibrations travel through the assembly.
Sound Dampening and Other Parts
Foam, silicone pads, gaskets, and switch films can be used to alter a keyboard’s sound. Case foam may reduce hollow resonance, while pads and gaskets can change contact between internal layers. These parts are optional in many designs, but they can be useful when tuning a custom keyboard.
Other practical components include screws, feet, cables, hot-swap sockets, and connectors. Each must match the board’s design. Ordering parts by name alone is not enough; dimensions, mounting method, layout, and electrical compatibility should also be checked.
Maintenance and Upgrades
Basic maintenance can extend a keyboard’s useful life. Remove and clean keycaps carefully, clear debris from the board, and check that switches and sockets are seated properly. Worn stabilizers or switches can be replaced, while a keycap puller, switch puller, and appropriate soldering tools can make repairs easier.
Understanding how the components interact helps you choose a keyboard that suits your work, gaming, or typing habits. It also makes customisation more predictable: keycaps affect contact and appearance, switches control the primary feel, and the PCB, plate, case, mounting system, and dampening materials work together to determine the final result.
