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The bearing Ferrography is particularly suitable for a method of identification and prediction of rolling contact fatigue. Rolling The lubricating oil extraction as part of the oil sample by using a high gradient magnetic field flowing through the solid foreign matter contained in the magnetic field of the oil sample, the size ratio is deposited on glass slides, and are able to observe the foreign particles on the shape, size, color and material thus able to clearly ascertain the type of wear, the operation state of the notice of the machine, to discover hidden. The Ferrography principle to identify the steel and other strong magnets as the main target, but also quite good identification of copper and other non-ferrous metals, sand, organic matter, and sealing debris and other foreign matter.
When the oil sample steel spherical particles having a diameter of 1 ~ 5μm, certainly when the bearings have been started fatigue micro-cracks. When the oil sample length to thickness ratio of 10:1 fatigue spalling particle length greater than 10μm, the bearing of non-normal fatigue wear has begun, when the length is greater than 100μm, the bearing has failed.
The third fatigue SWEEPINGS fatigue sheet length to thickness ratio of 30:1, and its length is between 20-50μm, the sheet often with voids. Fatigue occurs, the number of such sheet will be increased significantly, which can be common with the spherical particles as fatigue flag.
Ferrograph is usually divided into analytical Ferrograph, the a direct reading Ferrograph and online Ferrograph three categories.
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| 7005ATYNDBLP4 NSK | 25 | 47 | 12 |
| 7005A5TYNDBLP4 NSK | 25 | 47 | 12 |