It depends on the radiator and the valve head to which the thermostat will be fitted. In my case, I was fitted with a Danfoss and there's a specific adaptor ring. Once installed, the thermostat automatically calibrates the stroke of the valve plunger. If this operation has been carried out correctly, the valve operates as programmed.

Yes, I also have a Danfoss. Do you happen to know which special adapter ring you needed?