This shim is installed on the mating surfaces/bearing seats of components such as slewing mechanisms, boom telescopic cylinders, outriggers, or reducers. By replacing shims of different thicknesses, it precisely compensates for manufacturing and assembly tolerances, eliminates component loosening or jamming, and ensures smooth meshing and rotation. It fills tiny gaps between components, distributing loads evenly, reducing localized stress concentration caused by vibration and impact, preventing bolt/pin loosening, and extending component life. In some operating conditions, it assists in sealing component positioning, reducing dust and oil intrusion and improving sealing reliability. After long-term use, component wear can cause changes in clearances; this shim can be used for recalibration during maintenance to restore overall machine performance and safety standards.