Angular contact ball bearings, super-precision 71904 ACE/P4A
Bearing number : 71904 ACE/P4A
Size (mm) : 20x37x9
Brand : SKF
Bore Diameter (mm) : 20
Outer Diameter (mm) : 37
Width (mm) : 9
Bearing dimensions and specification in SKF catalogue:
d - 20 mm
D - 37 mm
B - 9 mm
d1 - 25.65 mm
d2 - 24.4 mm
D1 - 31.49 mm
r1,2 - min. - 0.3 mm
r3,4 - min. - 0.15 mm
a - 11.6 mm
da - min. - 22 mm
db - min. - 22 mm
Da - max. - 35 mm
Db - max. - 36.2 mm
ra - max. - 0.3 mm
rb - max. - 0.15 mm
dn - 26.7 mm
Basic dynamic load rating - C - 4.7 kN
Basic static load rating - C0 - 2.3 kN
Fatigue load limit - Pu - 0.098 kN
Limiting speed for grease lubrication - 52000 r/min
Limiting speed for oil lubrication - 78000 mm/min
Ball - Dw - 4.762 mm
Ball - z - 14
Gref - 0.5 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 - 42 N
Preload class B - GB - 130 N
Preload class C - GC - 250 N
Calculation factor - f - 1.04
Calculation factor - f1 - 0.99
Calculation factor - f2A - 1
Calculation factor - f2B - 1.04
Calculation factor - f2C - 1.07
Calculation factor - fHC - 1
Preload class A - 47 N/micron
Preload class B - 69 N/micron
Preload class C - 88 N/micron
Mass bearing - 0.036 kg
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