30311X3R Tapered Roller Bearing Specifications
Bore d (mm)
55
Outer D (mm)
120
Width B (mm)
31.5
Dynamic rating Cr (kN)
165
Static rating Cor (kN)
163
Grease limit speed (r/min)
3200
Oil limit speed (r/min)
4300
Frequently Asked Questions / FAQ
What are the exact dimensions of RUIST 30311X3R?
RUIST 30311X3R 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 30311X3R carry?
Dynamic load rating Cr = 165 kN and static load rating Cor = 163 kN. These figures let you calculate the L10 service life under your actual radial and axial loads.
Where is RUIST 30311X3R 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 30311X3R replace a SKF, FAG, NSK or TIMKEN unit?
Yes. Because bore 55 mm, OD 120 mm and width 31.5 mm match ISO dimensions, 30311X3R is dimensionally interchangeable with major-brand equivalents. Confirm clearance class (C3/C0) before ordering.