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1, part of the enterprise in the production of bearing-not strictly according to the specification for cleaning rust and oil seals VCI packaging requirements bearing on machining process of parts and Assembly, the INA finished bearing an anti-rust treatment. As rings in the turnaround process turnaround times are too long, outer ring cylindrical contact with corrosive liquids or gases.
2, some enterprises in the antirust lubricant, clean kerosene used in the production and the quality of the product does not meet the technology requirements of technical regulations.
3, the result of bearing steel prices dropped lower and lower, resulting in bearing steel slipping. As high levels of non-metallic impurities in the steel (steel elevated sulfur content in bringing down their corrosion resistance properties of material), the microstructure variation. Production companies with a complex source of bearing steel, is steel quality to fish mixed beads.
4, part of the company's poor environmental conditions, high levels of harmful substances in the air, working venues are too small, for effective protection against corrosion. Combined with hot weather phenomena such as production workers and violation of rust-proof procedures also exist.
5, some rust-proof, nylon paper (bag) and cartridge bearing packing material does not meet the requirements of INA bearing oil seal VCI packaging is one of the factors causing corrosion.
6, some bearing ring turning and grinding margin margin is small, on the outer scale, decarburized layer has not been fully removed is one of the reasons.
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| 4T-3490/3420 NTN | 38.1 | 79.375 | 29.771 |
| 4T-26878/26822 NTN | 38.1 | 79.375 | 25.4 |