Various types of sliding bearings are widely used in the chassis system, body system and hydraulic system of construction machinery and construction machinery. JF bimetal friction welded bushings are used in rollers, supporting sprockets and guide wheels; bimetal and SF series bushings are used in booms, connecting rods, outriggers and other parts of pump trucks; 500# series solid inlaid lubrication series Shaft sleeves are used in booms, sticks, amplitude modulation mechanisms, oil cylinders and other parts.