*  Railway - gearboxes, wheels, transmissions
*  Machine tools - lathe gearboxes, mills
*  Steel works - roll bearings, roll neck rings
*  Power generation - various generator components
Due to the need to insert a core and also that to be effective, the core has to be in relatively close proximity to the bore of the part to be heated, there are many application in which the above bearing heater type approach is not feasible.