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Unreasonable includes errors in design and calculation of structural design of ①; structural design, size, precision, inappropriate bearing alloys, coating materials, as well as backing material, bearing lubricant improper.
② flaw in production process, processing quality is not high include sintering, casting bearing alloy, double-rolled and coated sheet metal machining process behind compound plating process is defective, and so on, resulting in NSK bearing alloy microstructure, composition, performance, and sizing accuracy does not meet the design requirements.
③ negative Assembly process including Assembly process backward, uncivil, not strict production management; after Assembly did not meet the original design of assemble accuracy requirements. Diesel engine factory is not scientific, improper break-in can lead to early damage of Bush.
④ use and poor maintenance including unsound practices, lax maintenance system, using negligence, excessive overload, man-made or accidental conditions such as speeding and poor conditions.
⑤ other part involved failure of lubricating oil, filter improper or failed, housings or axle is too large deformations, damage, vibrations will cause bearing damage.
Rolling bearing rolling appearance if cracking, creasing or corrosion, vibration and noise of the attack as cyclical as the rivet rivets, most of their cycles can be fixed but necessarily correspond with speed, scars on the channel to continue attacks, injuries on the ball disappeared, and smooth such noises included with the unit and if there is any change.
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| 7220ATYNSULP4 NSK | 100 | 180 | 34 |
| 7220A5TYNSULP4 NSK | 100 | 180 | 34 |