Editing SMK J-M0404 alternate action

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{{infobox dswitch
| image name          = SMK lock -- recognition.jpg
| manufacturer        = [[SMK]]
| product code        = 
| family              = [[SMK J-M0404 series]]
| switch type         = [[Alternate action]]
| contact mechanism   = [[Metal leaf]]
| switch mount        = [[Plate mount]]
}}

'''SMK J-M0404 alternate action''' or '''SMK lock''' is a vintage mechanical [[lock key|lock switch]] in the [[SMK J-M0404 series]]. The [[keystem]] can be either vertical, or angled.<ref name="DT-Angled" /> The latching mechanism is enclosed in a containing block that slides into place along slots in the shell; a sprung, turned brass follower in this enclosure engages in a track in the slider.

The switch has "SMK" embossed on the bottom, either in the older SMK diamond logo (below), or the newer logo without the diamond.

No [[NEC]] or [[Maxi Switch]] variants have been encountered thus far.

==Keyboards==
*Some [[Apple M0110A]] variants

==Gallery==
The following switches are NOS from Electronic Surplus; no part number is known.

<gallery widths=250 heights=187>
File:SMK lock -- recognition.jpg                     | Top view
File:SMK lock -- lower side view.jpg                 | Lower side view
File:SMK lock -- contact plate detail.jpg            | Contact plate detail
File:SMK J-M0404 lock -- disassembled, top views.jpg | Disassembled, top/front views of components
</gallery>

==References==
<references>
<ref name="DT-Angled">Deskthority — [http://deskthority.net/photos-videos-f8/identify-this-t2266.html Identify this!] Posted 2012-03-24. Retrieved 2015-08-01.</ref>
</references>

[[Category:SMK switches]]
[[Category:Alternate action switches]]
[[Category:Metal contact switches]]
[[Category:List of all keyboard switches]]