This standard specifies the structural types and main dimensions, technical requirements, test methods, inspection rules and markings, packaging, transportation and storage of two types of standard fuel injector assemblies used for testing and adjusting fuel injection pumps on the fuel injection pump test bench. This standard applies to standard fuel injector assemblies used on fuel injection pump test benches. The approximate range of fuel supply per cycle of the fuel injection pump suitable for the pintle type standard injector assembly and the orifice plate type standard injector assembly is: Throttle pin type: ≤150 mm/cycle; orifice plate type: ≤300 mm/cycle. This standard applies to standard fuel injector assemblies used in oil pump and nozzle repair stations.