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2022-02-18 19:00:29 Edit this switch on GitHub

Kailh Box Heavy Dark Yellow

Manufacturer: Kailh
Brand: NovelKeys
Coloured (opaque)
Coloured (opaque)


A force-graph is a good way to help imagine how a switch might feel to the press. Many reputable manufacturers publish such graphs, either in their documentation or in their patents.
Not sure what you’re looking at? Check out Haata’s fantastic guide on reading force curve graphs.

Force graph for Kailh Box Heavy Dark Yellow
Overview video of Box Heavy Switches
Sound test in wood case, stock switches
Sound test in KBD Acrylic Tofu, lubed with 205g0
Switch Type icon
Linear switches have a smooth and linear feeling from top to bottom when pressed.

Mount type

Switch Mount icon


Kailh Box spring (smaller than MX)


Switch Volume icon
Standard switch with no dampers, can be further silenced with lubrication or O-rings.

This switch is clacky, the sound level is along the lines of most average budget linears (i.e. Gateron Yellows) but without as much of the scratch.

Lubrication info

Factory lubed icon
Factory lubed? Slight factory lube

Stock spring comes with slight factory lube at the bottom of the spring and a slight bit on the legs. However, there’s still a bit of spring ping and a slight bit of scratchiness. Both of these qualities can be solved with Krytox 205g0 and/or GPL 105. Otherwise, it’s a fairly smooth stock switch.

Looking for switch lubrication advice? Here's a great start

Switch film

Switch Film icon
Switch films do not fit these switches.
Why use switch film? Here's a good explanation and a great demonstration.

More info on films and Thicc films by Jinra.

Stem construction

Stem icon
The stem on this switch is of the box variety. Popularised by Kailh. It’s known for being more resistant to dust and moisture over long-term use.

Want to try this switch out for yourself?

Buy a single Kailh Box Heavy Dark Yellow sample switch
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Where to buy

These prices are subject to change at any time and should be used only as a rough guide (plus, quite often switches are not sold individually and can sometimes include discounts for larger quantities).

This information is not automatically updated.

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