ISO 3539:1975

Road vehicles — Injection nozzle holder with body, types 8 and 10, and injection nozzle holder with fixing flats, types 9 and 11

Specifies the dimensional requirements necessary for mounting and interchangeability of nozzle holders. Some figures illustrate shapes, dimensions and tolerances, and reference quantities of concern. The location of the fuel inlet and leak-off connections are not defined, because they vary according to the particular application.