68FC45250BW Bore 340 Mm, Four-row Cylindrical Roller Bearing For Rolling Mill, Machined Brass Cage
The 68FC45250BW Four-row cylindrical roller bearings is suitable for heavy machinery applications that bear huge radial loads. Classic applications include: support rolls of rolling mills, large gearboxes, heavy machine tool spindles, wind turbine spindles, ship propulsion shafts, and rotor supports for high-power compressors.
The 68FC45250BW bearing is a Four-row cylindrical roller bearing for cold rolling mill, hot rolling mill, billet mill with an inner diameter of 340 mm , an outer diameter of 450 mm, a width of 250 mm. Bearing steel rings, Bearing steel rolling mlement. It primarily bears radial, Its dynamic radial rated load is approximately 2750000 N, its static radial rated load is approximately 6480000 N. It uses C3 standard radial clearance, Open type, together determine its load-bearing capacity, rotational accuracy, and applicable working conditions.
Interchange code: FC6890250A (China), 340RV4502 (NSK), 68FC45250BW (KOYO)
68FC45250BW bearings ( 340 mm x 450 mm x 250 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 | 68FC45250BW |
| Interchangeable | KOYO 68FC45250BW |
| Desgin Figure | 1-3 |
| Cage | Machined brass cage |
| Radial internal clearance | C3 |
| Seal | Open |
| Bearing Type | Four-row cylindrical roller bearing for cold rolling mill, hot rolling mill, billet mill |
| Equivalent | FC6890250A (China) 340RV4502 (NSK) 68FC45250BW (KOYO) |
| Design type | Outer ring with rib, One inner ring |
| Bearing Weight [lb] | 233.688 |
| d φ Inside [inch] | 13.386 |
| D Φ Outside [inch] | 17.716 |
| B Width [inch] | 9.843 |
| Fw Raceway diameter inner ring [inch] | 14.488 |
| C [inch] | 9.843 |
| r min Chamfer outer ring | 2.1 mm |
| r1 min Chamfer inner ring | 2.1 mm |
| Cr Radial Dynamic [lbf] | 618200 |
| C0r Radial Static [lbf] | 1456704 |
| Mounting dimensions | |
| da min shaft [inch] | 13.858 |
| Da max housing [inch] | 17.244 |
| Da min housing [inch] | 16.693 |
| ra max Fillet radius [inch] | 0.079 |
| rb max Fillet radius [inch] | 0.079 |
The 68FC45250BW 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.
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