Recently, someone asked if there were any recycled bearings to sell to him. I was very confused. Can recycled bearings be reused? So I studied this issue for your reference and discussion. The risk of secondary use of bearings depends on many factors and cannot be generalized. The following is a detailed analysis of the risks of secondary use of bearings:
I. Risk factors
1. Damage degree: If the bearing has serious damage, such as cracks, deformation, excessive wear, etc., it will greatly affect its performance and safety. Continued use may cause equipment failure or even safety accidents.

2. Working environment: Harsh working environment, such as high temperature, high humidity, dust, corrosive substances, etc., will accelerate the aging and corrosion of bearings, reduce their service life and reliability, and increase the risk of secondary use.

3. Use conditions: Harsh use conditions such as high speed, high load, frequent start and stop, etc., will cause bearings to bear greater pressure and friction, easily lead to fatigue and damage, and the risk is higher for secondary use bearings.

4. Maintenance: Lack of proper lubrication and maintenance will lead to problems such as increased wear, temperature increase, and increased noise of bearings, affecting their normal operation and life. Even if the bearings appear to be intact, they may have internal hidden dangers if they are not properly maintained.

5. Sealing condition: Poor sealing will allow dust, moisture and other impurities to enter the bearing, causing pollution and corrosion, destroying the lubricating oil film, causing bearing wear and failure, and affecting the safety of secondary use.

6. Importance: For bearings on key equipment or important components, once a failure occurs, it may cause serious consequences. Therefore, they should be used more cautiously for secondary use. It is usually recommended to replace new bearings to ensure the stable operation of the equipment.

7. Running time: The performance and reliability of bearings that are close to or exceed the design life have been greatly reduced. The risk of secondary use is high and sudden failures are prone to occur.

II. Risk assessment and judgment
1. Appearance inspection: Carefully check the appearance of the bearing, including the inner and outer rings, rolling elements, cages and other parts to check for defects such as cracks, deformation, wear, rust, indentation, etc.

2. Dimensional accuracy measurement: Use professional measuring tools to detect the inner diameter, outer diameter, thickness, clearance and other dimensional parameters of the bearing to ensure that they meet the specified tolerance range to ensure the rotation accuracy and matching performance after installation.

3. Rotation flexibility check: Manually rotate the bearing to feel whether it rotates smoothly, whether there is any sticking, looseness or abnormal noise, so as to judge the internal condition and operation flexibility of the bearing. 

4. Vibration and noise detection: Use vibration measuring instruments and noise detection equipment to detect the vibration and noise levels of the bearing during operation, and judge whether the bearing has faults or potential problems by comparing with normal values.

5. Grease status check: Check whether the grease inside the bearing is deteriorated, dried up or contaminated. If the grease is in poor condition, it should be cleaned and refilled with appropriate grease in time.

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