NN4921MB Cylindrical Roller Bearing Specifications
Bore d (mm)
105
Outer D (mm)
145
Width B (mm)
40
Dynamic rating Cr (kN)
185
Static rating Cor (kN)
315
Grease limit speed (r/min)
6000
Oil limit speed (r/min)
7200
Frequently Asked Questions / FAQ
What are the exact dimensions of RUIST NN4921MB?
RUIST NN4921MB Cylindrical Roller Bearing: bore d = 105 mm, outer diameter D = 145 mm, width/height B = 40 mm. All dimensions follow ISO/DIN standards so it drops into existing housings without modification.
What load ratings does RUIST NN4921MB carry?
Dynamic load rating Cr = 185 kN and static load rating Cor = 315 kN. These figures let you calculate the L10 service life under your actual radial and axial loads.
Where is RUIST NN4921MB typically used?
Cylindrical Roller Bearing of this size are common in electric motors, gearboxes, pumps, conveyors, fans and compressors across heavy-industry plants.
Can RUIST NN4921MB replace a SKF, FAG, NSK or TIMKEN unit?
Yes. Because bore 105 mm, OD 145 mm and width 40 mm match ISO dimensions, NN4921MB is dimensionally interchangeable with major-brand equivalents. Confirm clearance class (C3/C0) before ordering.