Fuel injector

A fuel injector for a fuel injection system of an internal combustion engine, having a valve longitudinal axis, the fuel injector comprising:

• an energizable actuator in the form of an electromagnetic circuit which has a solenoid, an internal core, an external magnetic circuit component, and a movable armature for activating a valve closing member which cooperates with a valve seat surface provided on a valve seat member;
• and
• a thin-walled valve sleeve which extends at least in an area of the electromagnetic circuit, wherein a wall thickness t of the valve sleeve, at least in an area of a working air gap in a lower core area and in an upper armature area, is 0.2 mm<t<0.6 mm;
• wherein outer diameter DM of the external magnetic circuit component in a peripheral area of the solenoid is 10.5 mm<DM <13.5 mm, an outer diameter DA of the armature is 4.0 mm <DA <5.9 mm, and a zone having a magnetic flux density of B<0.01 T as a magnetic separation or having a magnetic flux density of 0.01 T<B<0.15 T as a magnetic throttle is provided in an area of the working air gap in the valve sleeve.