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NNU4948MBKR

Double-Row Cylindrical Roller Bearings
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Parts Number
NNU4948MBKRCC0P5 Double-Row Cylindrical Roller Bearings
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Parts Number

NNU4948MBKRCC0P5

Boundary Dimensions

NNU: Outer ring rib type Bearing Type
d 240 mm Bore diameter
D 320 mm Outside diameter
B 80 mm Width
r(min.) 2.1 mm Chamfer Dimension

Basic Load Ratings

Cr 720 kN Basic Dynamic Load Rating
C0r 1450 kN Basic Static Load Rating

Speeds

Grease 2400 min-1 Limiting Speed
Oil (Oil-air) 2900 min-1 Limiting Speed

Dimensions

Ew 263 mm Roller Circumscribed Circle Diameters
s 3.3 mm Axial Displacement

Abutment and Fillet Dimensions

da(min.) 251 mm Diameter of Shaft Abutment
d1a(min.) 254 mm Diameter of Shaft Abutment
Da(max.) 309 mm Diameter of Housing Abutment
ra(max.) 2 mm Radius of Shaft or Housing Fillet

Additional information

CC1(max.) 50 μm Clearance in Bearings with Cylindrical Bores
CC1(min.) 15 μm Clearance in Bearings with Cylindrical Bores
CC1(max.) 100 μm Clearance in Bearings with Tapered Bores
CC1(min.) 50 μm Clearance in Bearings with Tapered Bores
CC0(max.) 65 μm Clearance in Bearings with Tapered Bores
CC0(min.) 40 μm Clearance in Bearings with Tapered Bores
CC9(max.) Clearance CC9 applicale to cylindrical roller bearings with tapered bores in ISO Tolerance Classes 5 and 4. 50 μm Clearance in Bearings with Tapered Bores
CC9(min.) Clearance CC9 applicale to cylindrical roller bearings with tapered bores in ISO Tolerance Classes 5 and 4. 25 μm Clearance in Bearings with Tapered Bores
52 g/brg Recommended Grease Quantities

Holes Dimensions

dh 5 mm Hole Diameter
W 9 mm Oil Groove Width
m 4 Number of Holes

Mass

16.2 kg Mass(approx.)
CAD
More Information
NSK Product Type2 SP_CRB_DR_NNU
NSK Product Type Super Precision Bearing
Designations NNU4948MBKR

© NSK Ltd.

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