The most reasonably priced component used on the Cb600f3 Hornet 2010 (a) European Direct Sales / St 25k Thermostat is the Bolt,flange,sh,6x25.
Parts such as the Thermostat: Joint,water, Bolt,flange,6x23, Bolt,flange,nshf,, Case,thermostat are included in the Cb600f3 Hornet 2010 (a) European Direct Sales / St 25k Thermostat parts fiche.
In this schematic the "Bolt,flange,nshf," is used most often.