Keycap wall thickness affects the feel and sound of a mechanical keyboard, but it is only one part of the result. The switch, plate, case, mounting style, stabilisers and foam all interact with the keycap.
What does a 1.7 mm keycap wall mean?
“1.7 mm” refers to the approximate thickness of the keycap wall used in the product specification. Compared with a thinner keycap, a well-made 1.7 mm PBT cap can feel more substantial under the fingers, with less loose cavity resonance and a more stable, controlled sound character.
It is not a promise that every keyboard will sound identical. The same keycap can sound different on two boards because the switch and the keyboard structure are part of the acoustic system.
Why the keyboard still matters
When you press a key, the switch produces the initial sound, the keycap adds its own resonance, and the plate and case shape what you hear next. A thicker wall can change that contribution, but it cannot override a loud switch, a hollow case, loose stabilisers or a different mounting structure.
What a thickness figure can—and cannot—tell you
- It can indicate: the intended material mass and a potentially more solid feel than a very thin cap.
- It cannot prove: a specific pitch, volume or “thock” on every keyboard.
- It does not replace: checking material, profile, legend method and the exact physical key coverage.
What to check before ordering
- Confirm MX-style cross stems.
- Compare the exact coverage image with your Enter, left Shift, bottom row and spacebar.
- Confirm ANSI or ISO compatibility.
- Check the listed material and wall-thickness specification for the exact set.
- Consider the switch and keyboard construction together with the keycap—not as separate sound promises.
For physical fit, use the keyboard and keycap compatibility checklist and review Before Ordering.
Quick answer
A 1.7 mm PBT keycap wall can contribute to a more substantial feel, less loose resonance and a more stable sound character. The final sound still comes from the keycap, switch and keyboard working together.