78251D/78551 Tapered Roller Bearing Specifications
Bore d (mm)
63.5
Outer D (mm)
140.03
Width B (mm)
65.989
Dynamic rating Cr (kN)
276
Static rating Cor (kN)
—
Grease limit speed (r/min)
—
Oil limit speed (r/min)
—
Frequently Asked Questions / FAQ
What are the exact dimensions of RUIST 78251D/78551?
RUIST 78251D/78551 Tapered Roller Bearing: bore d = 63.5 mm, outer diameter D = 140.03 mm, width/height B = 65.989 mm. All dimensions follow ISO/DIN standards so it drops into existing housings without modification.
What load ratings does RUIST 78251D/78551 carry?
Dynamic load rating Cr = 276 kN and static load rating Cor = — kN. These figures let you calculate the L10 service life under your actual radial and axial loads.
Where is RUIST 78251D/78551 typically used?
Tapered Roller Bearing of this size are common in electric motors, gearboxes, pumps, conveyors, fans and compressors across heavy-industry plants.
Can RUIST 78251D/78551 replace a SKF, FAG, NSK or TIMKEN unit?
Yes. Because bore 63.5 mm, OD 140.03 mm and width 65.989 mm match ISO dimensions, 78251D/78551 is dimensionally interchangeable with major-brand equivalents. Confirm clearance class (C3/C0) before ordering.