SKF 71820ACD/P4 Angular contact ball bearings,SKF 71820 ACD/P4 Super-precision bearings-BEARINGPOWER Co.,Ltd.
Bearings, units and housings -- Super-precision bearings -- Angular contact ball bearings -- Angular contact ball bearings, super-precision -- SKF 71820 ACD/P4

71820 ACD/P4

Dimensions
d 100mm
D 125mm
B 13mm
d1 108.2mm
d2 108.2mm
D1 117mm
r1,2min.1mm
r3,4min.0.3mm
a 32.8mm
Abutment dimensions
damin.104.6mm
dbmin.104.6mm
Damax.120.4mm
Dbmax.123mm
ramax.1mm
rbmax.0.3mm
dn 109.1mm
Calculation data
Basic dynamic load ratingC 21.2kN
Basic static load ratingC0 27.5kN
Fatigue load limitPu 1.1kN
Attainable speed for grease lubrication  8500r/min
Attainable speed for oil-air lubrication  13000r/min
Ball diameterDw 7.144mm
Number of ballsz 34 
Reference grease quantityGref 3.2cm³
Preload and stiffness (back-to-back, face-to-face)
Preload class AGA 190N
Static axial stiffness, preload class A  211N/µm
Preload class BGB 570N
Static axial stiffness, preload class B  335N/µm
Preload class CGC 1140N
Static axial stiffness, preload class C  462N/µm
Calculation factors
Calculation factorf 1.4 
Calculation factorf1 0.97 
Calculation factorf2A 1 
Calculation factorf2B 1.08 
Calculation factorf2C 1.15 
Calculation factorfHC 1 
Calculation factore 0.68 
Calculation factor (single, tandem)Y2 0.87 
Calculation factor (single, tandem)Y0 0.38 
Calculation factor (single, tandem)X2 0.41 
Calculation factor (back-to-back, face-to-face)Y1 0.92 
Calculation factor (back-to-back, face-to-face)Y2 1.41 
Calculation factor (back-to-back, face-to-face)Y0 0.76 
Calculation factor (back-to-back, face-to-face)X2 0.67 
Mass
Mass bearing  0.31kg
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Hot number: 18737 211-2Z BD-231/710 CAK/W33-OH 31/710 H 305-2ZNR 401995 470921 53415 M + U 415 55x78x12 HMSA10 V 7013 CE/HCP4A 7021 CD/HCP4AL KRV 16 NCF 3044 CV NU 252 MA OH 31/1000 H OKC 710

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