Angular contact ball bearings, super-precision 71921 ACD/HCP4A
Bearing number : 71921 ACD/HCP4A
Size (mm) : 105x145x20
Brand : SKF
Bore Diameter (mm) : 105
Outer Diameter (mm) : 145
Width (mm) : 20
Bearing dimensions and specification in SKF catalogue:
d - 105 mm
D - 145 mm
B - 20 mm
d1 - 117.3 mm
d2 - 117.3 mm
D1 - 132.7 mm
r1,2 - min. - 1.1 mm
r3,4 - min. - 0.6 mm
a - 39.3 mm
da - min. - 111 mm
db - min. - 111 mm
Da - max. - 139 mm
Db - max. - 141 mm
ra - max. - 1 mm
rb - max. - 0.6 mm
dn - 120.6 mm
Basic dynamic load rating - C - 57.2 kN
Basic static load rating - C0 - 65.5 kN
Fatigue load limit - Pu - 2.5 kN
Limiting speed for grease lubrication - 9000 r/min
Limiting speed for oil lubrication - 15000 mm/min
Ball - Dw - 12.7 mm
Ball - z - 27
Gref - 11.1 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 - 360 N
Preload class B - GB - 720 N
Preload class C - GC - 1440 N
Preload class D - GD - 2880 N
Calculation factor - f - 1.25
Calculation factor - f1 - 0.98
Calculation factor - f2A - 1
Calculation factor - f2B - 1.07
Calculation factor - f2C - 1.12
Calculation factor - f2D - 1.17
Calculation factor - fHC - 1.04
Preload class A - 292 N/micron
Preload class B - 384 N/micron
Preload class C - 514 N/micron
Preload class D - 703 N/micron
Mass bearing - 0.699 kg
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