⚡ Quick answer
O-rings are small rubber or silicone rings you slip onto your keycap stems to cushion the bottom-out, which cuts the loud clack of a key hitting the plate. They are the cheapest and fastest way to make a board quieter, usually a few dollars for a full set. The catch is that they only soften the down-stroke, and they shorten your key travel. For most people a thin, medium-hardness ring is the sweet spot. If you want a cleaner result with full travel, silent switches or a foam mod do a better job.
What o-rings actually do
An o-ring sits under the keycap, on the stem. When you press a key, the cap lands on the rubber instead of slamming into the switch housing. That softens both the impact noise and the harsh feel of bottoming out. It changes nothing about the upstroke or the switch’s own click and rattle, so an o-ring quiets one part of the sound, not the whole thing. Think of it as a shock absorber for the last millimetre of the keypress.
Do o-rings actually work?
Yes, for what they are. If your board has a loud, hollow bottom-out, o-rings noticeably take the edge off for very little money. The trade-off is feel. Because the ring stops the key early, travel gets shorter and the bottom-out feels softer, sometimes a little mushy. Some people love that cushioned landing; others find it dead and lifeless. It comes down to taste, and at a few dollars a set it is cheap to find out which camp you are in.
What they will not do is turn a mechanical board into a laptop. Expect the bottom-out to drop from sharp to muted, not to vanish. If someone across the room can still hear you typing after fitting o-rings, that is normal.
Rubber or silicone? Materials that matter
Most o-rings are made from rubber or silicone, and the difference is mostly longevity. Rubber is cheap and works fine, but it can harden and yellow over a year or two. Silicone stays soft longer and does not degrade as fast, so it is the better long-term buy if you can find it. A newer option is foam or PORON dampeners, which some builders prefer because they compress more evenly and add less mush than a hard rubber ring.
Thickness and hardness, explained
Two numbers decide how an o-ring behaves: how thick it is, and how soft it is (its durometer, written as a number followed by A).
| Spec | Softer / thinner | Firmer / thicker |
|---|---|---|
| Thickness | ~0.2mm: barely shortens travel, light dampening | ~0.4mm+: cuts more travel, more dampening |
| Hardness | ~40A: squishier, absorbs more, softer landing | 50 to 70A: crisper, dampens less, keeps feel |
If you are unsure, start thin and medium-hard (around 0.2mm and 50A). It is the setup that quiets a board while changing the feel the least, and it is the one most people end up keeping.
What to look for when buying o-rings
There is no single best set, because the right ring depends on how much quiet you want and how much travel you are willing to give up. Buy by spec, not by brand, and match it to your goal:
- The safe all-rounder: a Cherry MX-compatible set around 0.2mm thickness and 50A hardness. Quiets the board with the least change to feel. Start here.
- Maximum quiet: a thicker (0.4mm), softer (40A) set. You accept shorter, softer travel in exchange for the biggest drop in noise.
- Keep it crisp: a thin, firmer (50 to 70A) set for people who want a little less clack without a soft, mushy bottom-out.
- Just testing: a cheap bulk pack of MX-compatible rings is fine for a first try before you commit to anything nicer.
Whatever you buy, check the listing explicitly says it fits Cherry MX-style stems, and buy enough for a full board plus spares (you will drop a few).
O-rings vs silent switches vs foam
O-rings are one of three common ways to quiet a board, and they are the cheapest rather than the best. Here is how they stack up.
| Method | Cost | Effort | Trade-off |
|---|---|---|---|
| O-rings | A few dollars | 15 to 20 min | Shorter, softer travel |
| Silent switches | Switch price | Swap or solder | Costs more, cleaner feel and full travel |
| Case and stab foam | Cheap | Open the case | Fixes case echo and rattle, not the bottom-out itself |
Serious about a quiet board? Do more than one. O-rings on the keycaps, a dampened switch, and a little foam in the case together beat any single fix. Our best silent switches guide covers the switch side, and the stabilizer guide handles the rattle o-rings cannot reach.
How to install o-rings
- Pull a keycap with a wire keycap puller. Pull straight up so you do not bend switch pins.
- Slip one o-ring over the stem on the underside of the keycap, seating it flat against the base of the cap.
- Press the keycap back on until it clicks into place.
- Repeat for every key. A full board of 87 to 104 keys takes about 15 to 20 minutes.
- Type for a day. If it feels too soft, swap to thinner rings; too loud still, go thicker.
Do o-rings damage keycaps or switches?
No. O-rings are fully reversible and do not harm keycaps or switches. They sit on the stem and press nothing that wears out, so if you dislike the feel you just pull the caps and remove them. The only real risk is bending a switch pin while pulling keycaps, which is a keycap-removal issue, not an o-ring one. Pull straight up and you will be fine.
Frequently asked questions
Do o-rings make a keyboard quieter?
Yes. O-rings soften the bottom-out noise, the sound of a key hitting the plate. They do not quiet the upstroke or the switch’s own click, so they cut one part of the noise rather than all of it. Expect the clack to drop from sharp to muted.
Do o-rings ruin typing feel?
They shorten travel and soften the bottom-out. Some people like the cushioned landing, others find it mushy. Thinner rings (around 0.2mm) reduce the effect, so you can quiet the board without changing the feel much. It is reversible if you dislike it.
What size o-rings fit a mechanical keyboard?
Rings sized for Cherry MX-style stems fit the vast majority of mechanical keyboards. Check the listing says MX-compatible before buying. Most sets include enough rings for a full-size board with spares.
Are o-rings or silent switches better?
Silent switches feel cleaner and keep full travel, but they cost more and mean swapping switches. O-rings are the cheap, reversible option if you just want to take the edge off a loud board without opening it up. Many people use both.
How many o-rings do I need?
One per key. A 60% board needs about 61, a tenkeyless around 87, and a full-size 104. Buy a set with a comfortable margin, since a few always go missing during install.
Are o-rings good for gaming?
They can be. The softer bottom-out reduces finger fatigue in long sessions, and the shorter travel means a slightly faster return for some players. Competitive players who bottom out hard sometimes prefer the cushioned landing, though it is a matter of feel rather than a real speed gain.
The bottom line
O-rings are the cheapest and easiest way to quiet a loud keyboard, and they are worth the few dollars if bottom-out noise bothers you. Start with a thin, medium-hardness, MX-compatible set, type on it for a day, and adjust the thickness from there. If you want a cleaner result without the softer feel, put the money toward silent switches or a foam mod instead, or stack all three for the quietest board you can build.