NNU4976 Cylindrical Roller Bearing Specifications
Bore d (mm)
380
Outer D (mm)
520
Width B (mm)
140
Dynamic rating Cr (kN)
1880
Static rating Cor (kN)
4600
Grease limit speed (r/min)
1500
Oil limit speed (r/min)
1800
Frequently Asked Questions / FAQ
What are the exact dimensions of RUIST NNU4976?
RUIST NNU4976 Cylindrical Roller Bearing: bore d = 380 mm, outer diameter D = 520 mm, width/height B = 140 mm. All dimensions follow ISO/DIN standards so it drops into existing housings without modification.
What load ratings does RUIST NNU4976 carry?
Dynamic load rating Cr = 1880 kN and static load rating Cor = 4600 kN. These figures let you calculate the L10 service life under your actual radial and axial loads.
Where is RUIST NNU4976 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 NNU4976 replace a SKF, FAG, NSK or TIMKEN unit?
Yes. Because bore 380 mm, OD 520 mm and width 140 mm match ISO dimensions, NNU4976 is dimensionally interchangeable with major-brand equivalents. Confirm clearance class (C3/C0) before ordering.