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NN4944MBKR

Double-Row Cylindrical Roller Bearings
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Parts Number
NN4944MBKRE44CC0P4Y Double-Row Cylindrical Roller Bearings
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Parts Number

NN4944MBKRE44CC0P4Y

Boundary Dimensions

NN: Inner ring rib type Bearing Type
d 220 mm Bore diameter
D 300 mm Outside diameter
B 80 mm Width
r(min.) 2.1 mm Chamfer Dimension

Basic Load Ratings

Cr 690 kN Basic Dynamic Load Rating
C0r 1330 kN Basic Static Load Rating

Speeds

Grease 2500 min-1 Limiting Speed
Oil (Oil-air) 3100 min-1 Limiting Speed

Dimensions

Ew 279 mm Roller Circumscribed Circle Diameters
s 3.3 mm Axial Displacement

Abutment and Fillet Dimensions

da(min.) 231 mm Diameter of Shaft Abutment
d1a(min.) 234 mm Diameter of Shaft Abutment
Da(min.) 281 mm Diameter of Housing Abutment
Da(max.) 289 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.) 90 μm Clearance in Bearings with Tapered Bores
CC1(min.) 45 μm Clearance in Bearings with Tapered Bores
CC0(max.) 60 μm Clearance in Bearings with Tapered Bores
CC0(min.) 35 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. 45 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. 20 μm Clearance in Bearings with Tapered Bores
37 g/brg Recommended Grease Quantities

Holes Dimensions

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

Mass

15.1 kg Mass(approx.)
CAD
More Information
NSK Product Type2 SP_CRB_DR_NN49
NSK Product Type Super Precision Bearing
Designations NN4944MBKR

© NSK Ltd.

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