deskthority

Well, these are interesting.

Cast metal (likely aluminium) keyswitches! They have small microswitches inside of them, along with rubber gaskets (probably ultra extreme environments).
Going from the pins, likely hotswap as well.

IMG_20171219_204256606_HDR
IMG_20171219_204309591_HDR
IMG_20171219_204430458

I have about a numpads worth of the switches with date codes (1981 to 1985):

• 8120
• 8126
• 8126
• 8126
• 8126
• 8126
• 8126
• 8127
• 8448
• 8501

The other interesting thing, is how different the switches feel with a little bit of WD40




Album: https://www.flickr.com/gp/triplehaata/a8a2p5

Wait WHAT?! XD

I'm guessing that these are going to be KS Series, since the part number format looks like that used with what we're calling SW Series. (Interestingly, with SD Series, the initial 1 became 1001, and the "1001SD" is left off the switches as it won't fit.)

Interesting indeed

Here's a 1KS1-T on ebay, with 100$ shipping to me (Free to our American friends).
https://www.ebay.com/itm/MICROSWITCH-1K ... 2592034581

So how do theses subjectively feel? Heavy I guess, smooth like SW? How pronounced is that tactility?

Also, do normal Honeywell key caps fit?

I can imagine one of these being used on a mass spec from the 1970's. Pretty amazing.

HaaTa wrote: The other interesting thing, is how different the switches feel with a little bit of WD40

Please use PTFE lube next time! 0.o

Slom wrote: Here's a 1KS1-T on ebay, with 100$ shipping to me

Some Micro Switch switches bought singly had a little leaflet inside the box — nothing visible in those photos, but it might be there. Sadly the leaflet I saw for an SW switch didn't actually call it "SW Series", but rather it read "Instruction Sheet SOLID STATE SWITCH MODULE REPLACEMENT":

http://www.ebay.ca/itm/LOT-OF-2-Honeywe ... 2254500100

Sadly, mine arrived loose, in a box labelled "Gourmet Small Batch French Fries", lol. So I don't have any further docs.

HaaTa wrote: Sadly, mine arrived loose, in a box labelled "Gourmet Small Batch French Fries", lol. So I don't have any further docs.

... Lol
I love gourmet French fries, those with some of the potato skin not peeled...