Electromagnetically actuated fuel injector

A fuel injector (1) having an injection nozzle (3); an injection valve (7) having a movable pin (20) for regulating fuel flow through the injection nozzle (3);an electromagnetic actuator (6) for moving the pin (20) between a closed position and an open position respectively closing and opening the injection valve (7); and a tubular supporting body (4), which has a central channel (5) for feeding pressurized fuel to the injection nozzle (3), and houses the electromagnetic actuator (6), the injection valve (7), and the pin (20); the supporting body (4) is formed by joining a one-piece tubular top member (8) housing the electromagnetic actuator (6) and made of high-tensile steel with poor magnetic characteristics, and a one-piece tubular bottom member (9) housing the injection valve (7) and made of a low-thermal-expansion alloy.