Angular contact ball bearings, super-precision 7004 ACD/HCP4A
Bearing number : 7004 ACD/HCP4A
Size (mm) : 20x42x12
Brand : SKF
Bore Diameter (mm) : 20
Outer Diameter (mm) : 42
Width (mm) : 12
Bearing dimensions and specification in SKF catalogue:
d - 20 mm
D - 42 mm
B - 12 mm
d1 - 27.1 mm
d2 - 27.1 mm
D1 - 34.8 mm
r1,2 - min. - 0.6 mm
r3,4 - min. - 0.3 mm
a - 13.3 mm
da - min. - 23.2 mm
db - min. - 23.2 mm
Da - max. - 38.8 mm
Db - max. - 40 mm
ra - max. - 0.6 mm
rb - max. - 0.3 mm
dn - 28.4 mm
Basic dynamic load rating - C - 8.3 kN
Basic static load rating - C0 - 4.2 kN
Fatigue load limit - Pu - 0.173 kN
Limiting speed for grease lubrication - 45000 r/min
Limiting speed for oil lubrication - 70000 mm/min
Ball - Dw - 6.35 mm
Ball - z - 12
Gref - 0.9 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 - 50 N
Preload class B - GB - 100 N
Preload class C - GC - 200 N
Preload class D - GD - 400 N
Calculation factor - f - 1.03
Calculation factor - f1 - 0.99
Calculation factor - f2A - 1
Calculation factor - f2B - 1.02
Calculation factor - f2C - 1.05
Calculation factor - f2D - 1.08
Calculation factor - fHC - 1.02
Preload class A - 60 N/micron
Preload class B - 77 N/micron
Preload class C - 100 N/micron
Preload class D - 133 N/micron
Mass bearing - 0.06 kg
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Deep groove ball bearings are particularly versatile. They are suitable for high and very high speeds, accommodate radial and axial loads in both directions and require little maintenance. Because deep groove ball bearings are the most widely used bearing type, they are available from SKF in many designs, variants and sizes.
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