Metall-Dom-Folientastaturen with Reliable Tactile Feedback

Snap-dome and tactile-dome describe the same family of stainless-steel domes — the difference is whether the design optimizes for audible click or felt click. A snap-dome membrane switch uses a taller four-leg geometry with a snap ratio above 50 % and a travel near 0.40 mm, producing a click loud enough to hear across a workshop floor. A tactile-dome membrane switch can use the same dome material at a lower profile (snap ratio closer to 35–45 %, travel near 0.20 mm) to deliver the same finger confirmation without the audible report — the right choice for clinical, library, or open-office contexts. The contact mechanism and the dome material (AISI 304 stainless steel) are identical; only the geometry and the resulting acoustics differ. For applications where neither matters and silence is the spec, see our non-tactile membrane switches page.

Start with the operator and the environment, not the datasheet. Three questions decide the force. First, what is on the operator’s hand: bare fingertip needs 150–250 gf, thin nitrile glove 200–300 gf, heavy work or winter glove 350–500 gf — the glove adds a damping layer, and a force that feels right bare-handed will not register through a glove at all. Second, how often does the key fire per shift: under 500 presses per day favors a higher force (350 gf+) to prevent accidental actuation, over 5,000 presses per day favors a lower force (150–250 gf) to prevent operator fatigue. Third, what is the safety consequence of a false press: an e-stop on a moving line warrants 400–600 gf so it only fires deliberately, while a volume-up button on a wall panel sits at 150 gf. For gloved-hand input at 2,000 presses per shift with no safety consequence, we typically build the first laminated sample at 280 gf and adjust after your engineer presses it.

Yes. The actuation force is set per dome, not per panel, so we can place a 150 gf dome under a frequently-used Enter key and a 450 gf dome under an adjacent emergency-confirm key in the same laminated keypad. We routinely build dual-force layouts for medical-device panels where the green confirm button must be deliberately pressed and the navigation keys must register at a light touch. The constraint is geometry: each dome footprint requires its own die-cut spacer pocket and its own contact pad pair, so the layout has to be locked at the design stage rather than added in revision. Across a production batch we hold force to ±5 gf per zone — meaning the 150 gf zone stays inside 145–155 gf and the 450 gf zone stays inside 445–455 gf. Send us the per-key force requirement on your CAD file and we will return a sample with the mixed-force layout tested key-by-key.