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7938C

Standard Series High Precision Angular Contact Ball Bearings
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Parts Number
7938CTRSUMP3 Standard Series High Precision Angular Contact Ball Bearings
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Parts Number

7938CTRSUMP3

Boundary Dimensions

d 190 mm Bore diameter
D 260 mm Outside diameter
B 33 mm Width
r(min.) 2 mm Chamfer Dimension
r1(min.) 1 mm Chamfer Dimension

Basic Load Ratings

Cr 185 kN Basic Dynamic Load Rating
C0r 192 kN Basic Static Load Rating

Speeds

Grease 4700 min-1 Limiting Speed
Oil (Oil-air) 7400 min-1 Limiting Speed

Dimensions

C: 15° Contact Angle
a 46.6 mm Effective Load Center

Abutment and Fillet Dimensions

da(min.) 200 mm Diameter of Shaft Abutment
Da(max.) 250 mm Diameter of Housing Abutment
Db(max.) 254 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 115 kN Permissible Axial Load

Calculation factors

f0 16.7 Factor

Preload,Rigidity(DB and DF arrangement)

Preload Axial Rigidity Measured axial clearance
EL 602N 163N/μm -12μm
L 1219N 217N/μm -25μm
M 2815N 315N/μm -49μm
H 5649N 442N/μm -79μm

Additional information

26 g/brg Recommended Grease Quantities

Mass

4.98 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)
7938CTRSUMP3 185 192 P3: Special class (ISO Class 4 dimensional tolerances and ISO Class 2 running accuracy.) 4700 7400 4.98

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CAD
More Information
NSK Product Type2 SP_ACBB_ST_C
NSK Product Type Super Precision Bearing
Designations 7938C

© NSK Ltd.

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