M257248DW.210.210D Tapered Roller Bearings, Four-row, TDO Types, In Inch Sizes Sheet Steel Cages
The M257248DW.210.210D Four-row tapered roller bearings are suitable for applications involving heavy combined loads. Classic applications include rolling mill work rolls, heavy machine tool spindles, mining crushers, oil drilling rig turntables, large wind turbine spindles, and shaft positioning ends of ship propulsion systems.
The M257248DW.210.210D bearing is a Tapered roller bearings, Four-row, TDO types, in inch sizes with an inner diameter of 304.902 mm , an outer diameter of 412.648 mm, a width of 266.7 mm. GCr15 / AISI 52100 rings, 20Cr2Ni4A rolling mlement. Its dynamic radial rated load is approximately 3648602 N, its static radial rated load is approximately 7699838 N. open type, together determine its load-bearing capacity, rotational accuracy, and applicable working conditions.
Interchange code: F-802024.TR4
M257248DW.210.210D bearings ( 304.902 mm x 412.648 mm x 266.7 mm) have the advantages of It can withstand extremely high radial loads and bidirectional axial loads, has a compact structure, and is highly rigid, making it suitable for heavy-duty impact conditions, and are therefore widely used in the Metallurgical rolling mills, large gearboxes, heavy mining machinery, oil drilling equipment.
| Part Number | M257248DW.210.210D |
| Bearing Type | Tapered roller bearings, Four-row, TDO types, in inch sizes |
| Seal type | open |
| Cage | sheet steel cages |
| bearing Series | M257200 |
| Design drawing | 1 |
| Rows Nomber | Four |
| Matched arrangement | TDO = TDO arrangement |
| Units | inch |
| Manufacturer Part Code | M257248DW.210.210D |
| Equivalent | F-802024.TR4 |
| Temperature - T(min) | -30 °C |
| Temperature - T(max) | +150 °C |
| Bore design | Z = cylindrical bore |
| Rings | The outer ring comprises a double ring and two single rings |
| Weight [kg] | 103 |
| d φ Inside [inch] | 12.004 |
| D Φ Outside [inch] | 16.246 |
| T Thickness [inch] | 10.500 |
| B Width [inch] | 10.500 |
| Cr Radial Dynamic [lbf] | 820205 |
| C0r Radial Static [lbf] | 1730923 |
| Cur Radial Fatigue [lbf] | 177083 |
| r1, r2(min.) Chamfer [mm] | 3.3 |
| r3, r4(min.) Chamfer [mm] | 3.3 |
| e Calculation coefficient | 0.32 |
| Y1 Calculation coefficient | 2.12 |
| Y2 Calculation coefficient | 3.15 |
| Y0 Calculation coefficient | 2.07 |
The M257248DW.210.210D Four-row tapered roller bearings typically consist of two double-raceway outer rings, two single-raceway inner rings, four rows of tapered rollers, a cage, and a spacer. The inner and outer rings and rollers are designed in metric or imperial units. The axial clearance or preload can be precisely adjusted by grinding the spacer.
The advantage of four-row tapered roller bearings is that they can withstand huge radial loads and bidirectional axial loads at the same time. They have extremely high overall rigidity and excellent load-bearing capacity, making them suitable for use as fixed ends to achieve precise axial positioning. However, their limiting speed is relatively lower than that of cylindrical roller bearings.
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