Angular contact ball bearings, super-precision 7228 ACD/HCP4A
Bearing number : 7228 ACD/HCP4A
Size (mm) : 140x250x42
Brand : SKF
Bore Diameter (mm) : 140
Outer Diameter (mm) : 250
Width (mm) : 42
Bearing dimensions and specification in SKF catalogue:
d - 140 mm
D - 250 mm
B - 42 mm
d1 - 176.8 mm
d2 - 176.8 mm
D1 - 213.2 mm
r1,2 - min. - 3 mm
r3,4 - min. - 1.5 mm
a - 66.7 mm
da - min. - 154 mm
db - min. - 154 mm
Da - max. - 236 mm
Db - max. - 241 mm
ra - max. - 2.5 mm
rb - max. - 1.5 mm
dn - 184.8 mm
Basic dynamic load rating - C - 212 kN
Basic static load rating - C0 - 228 kN
Fatigue load limit - Pu - 7 kN
Limiting speed for grease lubrication - 6000 r/min
Limiting speed for oil lubrication - 9000 mm/min
Ball - Dw - 30.162 mm
Ball - z - 18
Gref - 83.931 cm3
Calculation factor - e - 0.68
Calculation factor - Y2 - 0.87
Calculation factor - Y0 - 0.38
Calculation factor - X2 - 0.41
Calculation factor - Y1 - 0.92
Calculation factor - Y2 - 1.41
Calculation factor - Y0 - 0.76
Calculation factor - X2 - 0.67
Preload class A - GA - 1350 N
Preload class B - GB - 2700 N
Preload class C - GC - 5400 N
Preload class D - GD - 10800 N
Calculation factor - f - 1.09
Calculation factor - f1 - 0.99
Calculation factor - f2A - 1
Calculation factor - f2B - 1.01
Calculation factor - f2C - 1.03
Calculation factor - f2D - 1.06
Calculation factor - fHC - 1.01
Preload class A - 441 N/micron
Preload class B - 573 N/micron
Preload class C - 754 N/micron
Preload class D - 1011 N/micron
Mass bearing - 6.923 kg
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