SKF 7028ACD/P4AH1 Angular contact ball bearings,SKF 7028 ACD/P4AH1 Super-precision bearings-BEARINGPOWER Co.,Ltd.
Bearings, units and housings -- Super-precision bearings -- Angular contact ball bearings -- Angular contact ball bearings, super-precision -- SKF 7028 ACD/P4AH1

7028 ACD/P4AH1

Dimensions
d 140mm
D 210mm
B 33mm
d1 161.6mm
d2 161.6mm
D1 188.4mm
K 0.5mm
C1 8.9mm
r1,2min.2mm
r3,4min.1mm
a 57.5mm
Abutment dimensions
damin.149mm
dbmin.149mm
Damax.201mm
Dbmax.205mm
ramax.2mm
rbmax.1mm
dn 166.3mm
Calculation data
Basic dynamic load ratingC 146kN
Basic static load ratingC0 156kN
Fatigue load limitPu 5.1kN
Attainable speed for grease lubrication  5600r/min
Attainable speed for oil-air lubrication  8500r/min
Ball diameterDw 22.225mm
Number of ballsz 22 
Reference grease quantityGref 45cm³
Preload and stiffness (back-to-back, face-to-face)
Preload class AGA 900N
Static axial stiffness, preload class A  364N/µm
Preload class BGB 1800N
Static axial stiffness, preload class B  477N/µm
Preload class CGC 3600N
Static axial stiffness, preload class C  633N/µm
Preload class DGD 7200N
Static axial stiffness, preload class D  856N/µm
Calculation factors
Calculation factorf 1.16 
Calculation factorf1 0.99 
Calculation factorf2A 1 
Calculation factorf2B 1.02 
Calculation factorf2C 1.05 
Calculation factorf2D 1.08 
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  3.42kg
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Hot number: 122555 320x380x30 HDS1 R 33213 470371 91385 BC2B 316521 BD-C 31/670 KMB-AOHX 31/670 FSAF 22520 x 3.1/2 TLC OH 3180 HE NKI 28/30 OKCX 100 PF 72 SAF 22513 T SILR 25 ES W 639/2.5-2ZS

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