Bosch original 0445120356 High Pressure Common Rail Diesel Fuel Injector for Cummins QSC8.3 QSB6.7, Replacement for OEM 2855491, 504091504, 5303101 original new injector

Built for demanding diesel operations, the BOSCH 0445120356 is a high-pressure common rail fuel injector engineered to Bosch Original Equipment standards. It cross-references Cummins 5303101 and is listed for Cummins QSB6.7, ISB6.7, B6.7, Industrial 6.7L and generator engines. Its appliion coverage extends to construction and agricultural machinery, commercial vehicles, heavy-duty trucks, generator sets, mining equipment and marine auxiliary engines, giving distributors and fleet operators a clearly identified replacement option.

Within the common rail system, the injector receives ECU commands and activates its solenoid in milliseconds, delivering precisely metered fuel through micro-sized nozzle holes. The resulting fine atomization and optimized spray pattern support efficient combustion, responsive engine operation, power output, fuel economy and emission performance. Bosch CRI engineering, micron-level tolerance control and CNC precision manufacturing help maintain stable injection performance, while wear-resistant, hardened internal components support durability and long service life in high-pressure environments.

For procurement and maintenance planning, the injector supports Euro III, Euro IV and Euro V emission-compliance strategies and is available as Genuine Bosch New, Bosch Exchange or OEM Quality Replacement. Before installation, verify the OE number and engine model, inspect the injector seat and fuel rail, replace the copper washer and clean the fuel system. Injector coding may be recommended depending on the engine ECU configuration. These checks help ensure correct fitment and dependable fuel-system performance.