Needle roller bearings are widely and crucially used in the construction machinery industry. Due to its small cross-sectional size and strong radial bearing capacity, it is commonly used as the hinge point for the boom, arm, and bucket of excavators, as well as the steering knuckle, front and rear axles of loaders, which can withstand large radial forces and impact loads. In the slewing support and slewing mechanism of the crane, needle roller bearings assist in achieving flexible rotation and reducing friction. At the same time, the transmission system and working devices of bulldozers, rollers and other equipment also rely on needle roller bearings, which can improve the stability, reliability and work efficiency of the equipment, ensuring the smooth operation of construction machinery.