580309 bearings ( 980 mm x 1310 mm x 880 mm) have the advantages of Extremely high radial load capacity, high rigidity, separable design, and are therefore widely used in the metallurgical rolling mills, large gearboxes, and heavy-duty extrusion presses.

| Part Number | 580309 |
| Interchangeable | FAG 580309 |
| Desgin Figure | 1 |
| Cage | pin type cages |
| Seal | Open |
| Bearing Type | Cylindrical Roller Bearings, four row for interference fit on the roll neck |
| Equivalent | FCDP196262880/YA6 (China) 319303 (SKF) 580309 (FAG) |
| Bearing Weight [lb] | 7616.893 |
| d φ Inside [inch] | 38.583 |
| D Φ Outside [inch] | 51.575 |
| B Width [inch] | 34.646 |
| F Raceway diameter inner ring [inch] | 41.799 |
| rs min Chamfer inner rings | 20x20° mm |
| r1s min Chamfer outer rings | 6 mm |
| Cr Radial Dynamic [lbf] | 7980400 |
| C0r Radial Static [lbf] | 20906400 |
The 580309 Four-row cylindrical roller bearings mainly consist of an inner ring, an outer ring, four rows of cylindrical rollers, a cage, and a spacer. Common structures use a configuration of double outer rings (each with double raceways) and a single inner ring (with four raceways), or an interchangeable combination of inner and outer rings. Axial positioning and load distribution are achieved through the spacer.
The advantages of four-row cylindrical roller bearings are their extremely high radial load capacity, high rigidity, and the line contact between the rollers and raceways, resulting in a low coefficient of friction and allowing for high-speed operation under heavy loads. They can also be used as floating end bearings, capable of withstanding axial displacement caused by thermal expansion, and are easy to install and maintain.















