30311 Tapered Roller Bearing Specifications
Bore d (mm)
55
Outer D (mm)
120
Width B (mm)
31.5
Dynamic rating Cr (kN)
176
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 30311?
RUIST 30311 Tapered Roller Bearing: bore d = 55 mm, outer diameter D = 120 mm, width/height B = 31.5 mm. All dimensions follow ISO/DIN standards so it drops into existing housings without modification.
What load ratings does RUIST 30311 carry?
Dynamic load rating Cr = 176 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 30311 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 30311 replace a SKF, FAG, NSK or TIMKEN unit?
Yes. Because bore 55 mm, OD 120 mm and width 31.5 mm match ISO dimensions, 30311 is dimensionally interchangeable with major-brand equivalents. Confirm clearance class (C3/C0) before ordering.