The KSC641J is a tactile Switche made by C&K with 5 pins. -40℃~+85℃ 3.4N 32V 50mA IP67 SPST-NO Surface Mount,Vertical - Tactile Switches.
JLCPCB lists it (part C19535438). 2 open-source boards in 2 repositories on GitHub use it.
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The library has no footprint for this part yet.
Motasim-1/Wifi-quadcopter-pcb
Custom PCB design for a WiFi-controlled quadcopter based on the ESP32 microcontroller. The board was designed in KiCad, assembled using solder paste and a reflow oven, and tested with four motor outputs controlled…
heimdall-suite/heimdall-switch
Wireless power switch node for RC vehicles, part of the Heimdall Suite.
C&K publishes it: the Datasheet link on this page opens it.
JLCPCB lists it as part C19535438, with 0 in stock; the sellers' links on this page open their listings.
2 boards in 2 repositories on GitHub; the most starred are listed on this page, with their KiCad files.