T251/T251W Steering Pivot Thrust Tapered Roller Bearing, Full Complement (cageless)
The T251/T251W Thrust tapered roller bearings are suitable for heavy-duty, high-rigidity axial load applications. Classic applications include crane slewing mechanisms, oil drilling rig rotary tables, rolling mill pressing mechanisms, heavy machine tool spindles, ship propeller thrust shafts, and the axial positioning ends of large gearboxes.
The T251/T251W bearing is a Steering pivot thrust tapered roller bearing, full complement (cageless) with an inner diameter of 63.754 mm , an outer diameter of 111.125 mm, a width of 26.988 mm. It typically uses PN (ABEC-1) grade precision tolerances and bearing steel rings, bearing steel rolling mlement. together determine its load-bearing capacity, rotational accuracy, and applicable working conditions.
T251/T251W bearings ( 63.754 mm x 111.125 mm x 26.988 mm) have the advantages of Withstanding extremely large and heavy unidirectional axial thrust, and are therefore widely used in the oscillating steering pivot.
| Part Number | T251/T251W |
| Design type | TTC: Two tapered races; Full complement of rollers, no cage; Stamped-steel assembly retainer that fully wraps around one race. |
| Bearing Type | Steering pivot thrust tapered roller bearing, full complement (cageless) |
| Interchangeable | TIMKEN T251/T251W |
| Manufacturer Part Code | T251/T251W |
| Units | Inch |
| Tolerance class | PN (ABEC-1) |
| Oil Holes in Retainer | T251 (No), T251W (Yes) |
| Steering Pivot Rating [lbf] | 27831 |
| d φ Inside [inch] | 2.5100 |
| D Φ Outside [inch] | 4.3750 |
| T Width [inch] | 1.0625 |
| R (Max) Shaft Fillet Radius [inch] | 0.0315 |
| Weight [lb] | 2.4251 |
The T251/T251W Thrust tapered roller bearings mainly consist of a shaft ring, a housing ring, tapered rollers, and a cage. The raceways of the shaft ring and housing ring have a conical surface structure, and the rollers make line contact with the raceways. The cage is typically made of machined brass or stamped steel to ensure proper roller guidance.
Thrust tapered roller bearings can withstand enormous unidirectional axial loads and also possess a certain radial load-bearing capacity, far exceeding that of thrust ball bearings. They offer high rigidity, strong impact resistance, and precise axial positioning and preload can be achieved through the tapered roller structure.
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