Angular contact ball bearings, super-precision 71912 ACE/HCP4AH1
Bearing number : 71912 ACE/HCP4AH1
Size (mm) : 60x85x13
Brand : SKF
Bore Diameter (mm) : 60
Outer Diameter (mm) : 85
Width (mm) : 13
Bearing dimensions and specification in SKF catalogue:
d - 60 mm
D - 85 mm
B - 13 mm
d1 - 67.75 mm
d2 - 65.7 mm
D1 - 77.3 mm
K - 0.5 mm
C1 - 3.83 mm
r1,2 - min. - 1 mm
r3,4 - min. - 0.3 mm
a - 24.6 mm
da - min. - 64.6 mm
db - min. - 62 mm
Da - max. - 80.4 mm
Db - max. - 83 mm
ra - max. - 1 mm
rb - max. - 0.3 mm
dn - 69.6 mm
Basic dynamic load rating - C - 15.3 kN
Basic static load rating - C0 - 11.2 kN
Fatigue load limit - Pu - 0.475 kN
Limiting speed for grease lubrication - 23000 r/min
Limiting speed for oil lubrication - 36000 mm/min
Ball - Dw - 7.938 mm
Ball - z - 23
Gref - 2.5 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 - 139 N
Preload class B - GB - 418 N
Preload class C - GC - 836 N
Calculation factor - f - 1.13
Calculation factor - f1 - 0.98
Calculation factor - f2A - 1
Calculation factor - f2B - 1.04
Calculation factor - f2C - 1.08
Calculation factor - fHC - 1.01
Preload class A - 128 N/micron
Preload class B - 193 N/micron
Preload class C - 254 N/micron
Mass bearing - 0.162 kg
Quality Bearings Online - Deep Groove, Tapers, Precisi
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Ball Bearing Comparison - practicalmachinist.c
The major players, INA/FAG, SKF and Timken all manufacture in China and have top notch quality control, so those bearings should be the same quality as those made here and in Europe. Timken is the only major I know of that imports Chinese bearings, so if you see an SKF or FAG with Chinese markings on it, be suspect.
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