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.
SAE J629-2002 Referenced Document
ISO 2697:1999 Diesel engines - Fuel nozzles - Size "S"
ISO 2699:1994 Diesel engines; flange-mounted fuel injectors, size "S"; types 2, 3, 4, 5 and 6