SKF 7228ACD/HCP4A Angular contact ball bearings,SKF 7228 ACD/HCP4A Super-precision bearings-BEARINGPOWER Co.,Ltd.
Bearings, units and housings -- Super-precision bearings -- Angular contact ball bearings -- Angular contact ball bearings, super-precision -- SKF 7228 ACD/HCP4A

7228 ACD/HCP4A

Dimensions
d 140mm
D 250mm
B 42mm
d1 176.8mm
d2 176.8mm
D1 213.2mm
r1,2min.3mm
r3,4min.1.5mm
a 66.7mm
Abutment dimensions
damin.154mm
dbmin.154mm
Damax.236mm
Dbmax.241mm
ramax.2.5mm
rbmax.1.5mm
dn 184.8mm
Calculation data
Basic dynamic load ratingC 212kN
Basic static load ratingC0 228kN
Fatigue load limitPu 6.95kN
Attainable speed for grease lubrication  6000r/min
Attainable speed for oil-air lubrication  9000r/min
Ball diameterDw 30.162mm
Number of ballsz 18 
Reference grease quantityGref 83.931cm³
Preload and stiffness (back-to-back, face-to-face)
Preload class AGA 1350N
Static axial stiffness, preload class A  441N/µm
Preload class BGB 2700N
Static axial stiffness, preload class B  573N/µm
Preload class CGC 5400N
Static axial stiffness, preload class C  754N/µm
Preload class DGD 10800N
Static axial stiffness, preload class D  1011N/µm
Calculation factors
Calculation factorf 1.09 
Calculation factorf1 0.99 
Calculation factorf2A 1 
Calculation factorf2B 1.01 
Calculation factorf2C 1.03 
Calculation factorf2D 1.06 
Calculation factorfHC 1.01 
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  6.92kg
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Hot number: 239/750 CAK/W33 280x310x16 HDS2 R 55x78x10 HMS5 RG 6305-2Z/VA201 76225 FSAF 1316 T FY 2. TF/VA201 GS 89312 NJ 315 ECM NNCF 4944 CV RNU 310 ECJ TUWK 1.3/8 LTA SNL 3288 SSAFS 22528 x 4.7/8 T W 624 R-2RZ

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