Fuel injector valve seat assembly including insert locating and retention features

A fuel injector comprising

• a fuel injector housing;
• a valve seat disposed in the fuel injector housing, the valve seat including
• a base that is mechanically connected to an end of the fuel injector housing and includes an inner surface, and
• an insert that cooperates with the base to define a spray hole that extends between the inner surface and an exterior of the valve seat;
• and
• a valve body disposed in the fuel injector housing and operable to move along a longitudinal axis of the fuel injector housing between a first position in which the valve body abuts the inner surface and in which fluid is prevented from passing through the spray hole, and a second position in which the valve body is spaced apart from the inner surface and in which fluid is permitted to pass through the spray hole, wherein
• a surface of the insert includes surface features that engage with corresponding surface features formed on a surface of the base so as to retain the insert in a predetermined rotational orientation about the longitudinal axis relative to the base,
• the insert has a polygonal peripheral shape when viewed in a cross section that is transverse to the longitudinal axis, a corner of the polygonal peripheral shape of the insert corresponding to one of the surface features of the insert, and
• the insert is disposed in a vacancy of the base that has a corresponding peripheral shape, a corner of the polygonal peripheral shape of the vacancy corresponding to one of the surface features of the base.