Kailh BOX Spring Linear Switches

This linear mechanical switch suits users who want a smooth, consistent keystroke with a relatively light actuation force. It fits well for typists and gamers who prefer a straightforward, non-tactile feel without added noise reduction. Its waterproof and dustproof design makes it a practical choice for environments where durability is important.

Feel & Sound

The switch offers a smooth linear feel with no tactile bump or click, making each keypress consistent from start to bottom out. It is not silent, so it produces moderate noise typical of linear switches. The bottom-out feel is firm due to the extended stainless steel spring, which may provide a noticeable feedback on keypress completion.

Actuation Characteristics

With a 40g actuation force and a short pre-travel of 1.6mm, the switch responds quickly to keypresses, supporting fast typing or gaming inputs. The total travel distance of 3.3mm is standard, allowing for comfortable key movement without feeling too shallow or deep.

Build Quality

The switch features a polycarbonate top housing and POM bottom housing, materials known for durability and smoothness. The POM stem reduces friction, contributing to the linear feel. A 20mm extended stainless steel spring enhances durability and provides consistent resistance over time. The switch is factory lubed, which reduces initial scratchiness, a common issue in new switches.

Compatibility

It uses a PCB mount with five pins, ensuring stable installation on compatible boards. The transparent light pipe supports enhanced backlighting effects with SMD LEDs. It is not designed for hot-swap compatibility, so soldering is required for installation.

Trade-offs

The switch is not silent, so it may be less suitable for noise-sensitive environments. Although factory lubed, additional lubrication might be needed for users seeking a smoother or quieter experience. The linear design lacks tactile feedback, which some typists prefer for error reduction. Unknown if it exhibits spring ping or stem wobble.