This SAE Standard specifies the dimensional requirements necessary for the mounting and interchangeability of two types of fuel injectors in diesel engines. The location and dimensions of the fuel inlet@ leak-off connections@ and flange design are not defined since they may vary according to the particular application. Field of Application??This document is applicable to nozzle holder types 5 and 6 of a flange mounted design with a 21.0 mm (nominal) shank diameter used with size ??S?? nozzles specified in ISO 2697. The internal construction of the fuel injector remains optional with the manufacturer.