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Following a review of gear box good quality, INA bearings installation combined with normal, lubrication full, original lubricant on the outside of the INA bearings half were suspected to have been excluded. But all the inner ring raceway indentation or hole or surface cracking type of fatigue spalling, rather than peeling damage for oil is not the occurrence of such phenomena.
Discovery Channel surface mixing with iron, copper, aluminum, zinc and other metals, sediment particles and rubber, plastics and other non-metallic debris.
Judge: indentation damage caused by these foreign bodies, and the integrity of the oil film, caused early failure of INA bearings fatigue testing verified, such judgment is correct.
Has taken increasing heat treatment of steel balls, special double-row ball and even vacuum remelted steel bearings, cost more and more expensive, and the modest increase in life expectancy.
Final development into "seal clean" bearings, was a great success. This INA bearings is the original standard bearings plus a special structure of rubber seal ring on each side, features the seal used primarily to prevent the dirt of the INA bearings, with the main aim to maintain oil-bearings seals as different.
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| 24032CE4 NSK | 160 | 240 | 80 |
| 23032CDE4 NSK | 160 | 240 | 60 |