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SMK SS Series

SS Series is a type of notebook keyboard from SMK. Its market introduction date was the 4th of June 1996 (not 1966 as SMK claimed). Judging by Wayback Machine archives, lifetime at introduction was 5 million cycles, increased to 10 million by 1998.


Total height 7.5 mm
Weight 100 g for an 83-key keyboard
Travel 3 mm
Pitch 19.05 mm
Operating force 50±20 gf
Bounce 5 ms max.
Contact resistance 500 Ω max.
Lifetime 5 million (1996)
10 million (19968)
Type Membrane
Keytop Step type