Bimetal thermostat coil consists of two or more metallic strips with different thermal expansion bonded together.when heated up it bends in a pre-determined manner and can be used to monitor,measure and regulate temperature.Its main application are in thermostats for heating chamber or fan clutch but they are also used in control devices for instance in automobiles.Bimetal is also manufactured as disc material to very close tolerances which give a snap action at a given.