Perkins Common Rail (CR) Coil Adjustment Shim is a critical calibration component used in Perkins diesel injectors, designed to ensure injection pressure stability under high pressure and enhance the precision of the fuel system. By precisely regulating the amount of fuel injected across the entire operating range with micron-level accuracy, it supports stable engine performance at all RPM levels, contributes to maximizing power output, and helps optimize emission levels. Specifically engineered for Perkins injection systems, this high-precision component serves as a standard part of Perkins common rail systems. With superior surface quality and excellent wear and fatigue resistance, the adjustment shim is manufactured with high dimensional accuracy through an advanced lapping process to meet strict tolerance requirements.