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Corrosion is mainly caused by the following reasons:
1, bearing on some of the production does not meet the Clean Rust bearings sealed packaging procedures and parts and SKF bearings rust treatment product assembly process in strict accordance with the requirements. Ring in the transfer process, such as the turnaround time is too long, cylindrical corrosive liquids or gases outer contact.
2, in the anti-rust lubricant used in the production of some companies, cleaning supplies, kerosene and other technologies to meet quality requirements.
3, bearing steel prices dropped lower and lower, in a gradual decline in bearing steel making. Non-metallic impurities such as iron and steel high (higher sulfur steel corrosion-resistant material in its performance degradation), the deviation of the microstructure. In more complex FAG bearings use steel manufacturers, steel quality is a mixture of fish and dragons.
4, the company's environmental conditions are poor, the air of harmful substances in the high level of work space, and some too small to be effective rust treatment. Combined with hot weather, production workers and violation of the rules so there are some rust there.
5, some companies rust-proof paper, nylon paper (bags) and plastic pipes, such as INA rolling bearings sealed packaging materials do not meet the requirements of rust-proof packaging, is one of the factors causing corrosion.
6, some enterprises TIMKEN bearing rings turning and grinding allowance is too small amplitude, the outer oxidation and decarbonization is also one of the reasons, can not be removed completely.
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| 7221ADB NSK | 105 | 190 | 36 |
| 7021CDB NSK | 105 | 160 | 26 |