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1, some companies KOYO bearings in the production process in strict accordance with the the cleaning the rust procedures and oil seal rust packaging requirements bearing parts processing and assembly of finished bearing anti-rust treatment. Such as the ferrule in the turnaround process turnaround time is too long, the outer cylindrical contact with corrosive liquid or gas.
2, some enterprises used in the production of anti-rust lubricant, cleaning kerosene product quality requirements to reach the technology requirements.
3, as bearing steel prices dropped lower and lower, resulting in bearing steel gradual decline. Such as steel in high levels of non-metallic impurities (steel sulfur content increases the material's own anti-corrosion performance degradation), microstructure deviation. Is the production of enterprises with more complex sources of bearing steel, the quality of steel is a mixture of ichthyosaurs.
4, some enterprises poor environmental conditions, high content of harmful substances in the air, turnover venue is too small, it is difficult to carry out effective anti-rust treatment. Coupled with the hot weather, there are production workers in violation of rust procedures.
5, some enterprises rust-proof paper, nylon paper (bags) and plastic tube KOYO bearings packaging materials do not meet the requirements of rolling bearing oil seal rust-proof packaging is also one of the factors causing corrosion.
6, some enterprises KOYO bearing ring turning margins and small grinding allowance on the outer oxide, decarburization layer is also one of the reasons can not be completely removed.
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| 30330U NTN | 150 | 320 | 65 |
| 32230U NTN | 150 | 270 | 73 |