Connect Thick thermocouple wire to Type K Connector
Ideally, you would get a thermocouple plug of the same type which will ensure that the alloys match which will also provide screw clamp connections. To use these, you will need a matching thermocouple PCB jack for it to plug into. Note there is both a standard size and a miniature size.



From https://www.omega.ca/en/sensors-and-sensing-equipment/temperature/c/thermocouple-and-rtd-connectors

But if you don't care you could just use a screw terminal block. You should avoid trying to solder them.