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7948C

Standard Series High Precision Angular Contact Ball Bearings
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Parts Number
7948CTRSUMP3 Standard Series High Precision Angular Contact Ball Bearings
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Parts Number

7948CTRSUMP3

Boundary Dimensions

d 240 mm Bore diameter
D 320 mm Outside diameter
B 38 mm Width
r(min.) 2.1 mm Chamfer Dimension
r1(min.) 1.1 mm Chamfer Dimension

Basic Load Ratings

Cr 252 kN Basic Dynamic Load Rating
C0r 286 kN Basic Static Load Rating

Speeds

Grease 3800 min-1 Limiting Speed
Oil (Oil-air) 5900 min-1 Limiting Speed

Dimensions

C: 15° Contact Angle
a 56.5 mm Effective Load Center

Abutment and Fillet Dimensions

da(min.) 252 mm Diameter of Shaft Abutment
Da(max.) 308 mm Diameter of Housing Abutment
Db(max.) 313 mm Diameter of Housing Abutment
ra(max.) 2 mm Radius of Shaft or Housing Fillet
rb(max.) 1 mm Radius of Shaft or Housing Fillet

Performance

Pa 166 kN Permissible Axial Load

Calculation factors

f0 16.8 Factor

Preload,Rigidity(DB and DF arrangement)

Preload Axial Rigidity Measured axial clearance
EL 902N 210N/μm -17μm
L 1822N 280N/μm -32μm
M 4129N 403N/μm -59μm
H 8237N 565N/μm -93μm

Additional information

41 g/brg Recommended Grease Quantities

Mass

8.30 kg Mass(approx.)
Designations Basic Load Ratings Axial Internal Clearance Accuracy Limiting Speeds Mass
Cr
 C0r
 min
 max
 Grease
(min-1)		 Oil (Oil-air)
(min-1)
(kg)
7948CTRSUMP3 252 286 P3: Special class (ISO Class 4 dimensional tolerances and ISO Class 2 running accuracy.) 3800 5900 8.30

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CAD
More Information
NSK Product Type2 SP_ACBB_ST_C
NSK Product Type Super Precision Bearing
Designations 7948C

© NSK Ltd.

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