Editing SMK J-M0404 series (section)

==Description==
The base is branded "SMK", typically with the old SMK logo; there is no top branding. The switch was still in use in 1989, based on the PCB date of an [[Apple M0110A]] (Macintosh Plus) keyboard;<ref name="KBT-M0110A" /> in this example, the newer SMK logo is present.

The contact system is fairly simple. A metal "crossbar" is held in place by a groove in the upper shell, and a vertical leaf spring rests against it. When the slider is inserted, a ramp at the bottom holds the leaf spring away from the crossbar. As the slider is depressed, the leaf spring moves back against the crossbar and closes the circuit. The contacts are gold-plated. The contact system is essentially the same as that used by [[Omron B3G series]].

"Operation Force" is cited as both "90 grams ± 20%" ''and'' "90 ± 30 g" in the same brochure, even though 20% of 90 is 18.

The series covers both momentary and alternate action switches. All switches found to date are [[SPST]]. There is technically no reason why the design should not support DPST, although the shell is specifically designed to hold only one pair of contacts. Straight stem sliders are however symmetrical and could operate two pairs of contacts simultaneously.