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The criteria for discarding sliding bearings vary depending on the bearing’s structural design: 1. Bushing: 1) The inner diameter of the bushing exceeds the specified maximum value, that is, the shaft diameter plus the maximum allowable clearance of the bearing； 2) When the outer diameter of the shaft sleeve is below the minimum specified value, and the knurling method cannot ensure compliance with the quality requirements ； 3) When the shaft sleeve is burned or sticks to the shaft. II. Split bearings 1) When the bearing alloy is severely worn and its thickness has decreased by more than 1/2 ； 2) When the bearing alloy layer peels off and shows severe cracking, covering more than 1/3 of the area ； 3) The bearing alloy layer is severely burned out ； 4) When the contact angle between the bearing alloy and the shaft is greater than 120º, or when it is not possible to adjust the contact angle by scraping the bearing surface, or when the lateral clearance is too large to be adjusted. III. Thin-walled tiles 1) Bearing alloy layer melted ； 2) The bearing alloy layer is severely worn and damaged by galling, making it impossible to tighten it using shims ； 3) When the bearing alloy layer peels off or cracks ； 4) The wear of the bearing alloy layer is not too severe, but it cannot be guaranteed during the maintenance interval ； 5) If the bearing alloy layer is worn, the bearing needs to be tightened using shims; however, this is applicable only when the thickness of the shims exceeds 0.5 mm. IV. Thrust Bearings 1) When the thrust pads are severely worn, with their thickness reduced by more than 1/2 ； 2) When the thrust bearing pads melt ； 3) Thrust bearing shells come loose or crack. In practical use, we have found that a variety of bearings sold by Tianjin Demerui Bearing Co., Ltd., such as Demerui NSK bearings, Demerui SKF bearings, imported sliding bearings from Demerui, Demerui FAG bearings, Demerui IKO bearings, and other similar products, offer stable and reliable quality. Those who are interested can visit the company’s website to learn more about the details of these various bearings.