SKF 7228CD/P4A Angular contact ball bearings,SKF 7228 CD/P4A 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 CD/P4A

7228 CD/P4A

Dimensions
d 140mm
D 250mm
B 42mm
d1 176.8mm
d2 176.8mm
D1 213.2mm
r1,2min.3mm
r3,4min.1.5mm
a 47.3mm
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 221kN
Basic static load ratingC0 240kN
Fatigue load limitPu 7.35kN
Attainable speed for grease lubrication  5600r/min
Attainable speed for oil-air lubrication  8500r/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 850N
Static axial stiffness, preload class A  163N/µm
Preload class BGB 1700N
Static axial stiffness, preload class B  220N/µm
Preload class CGC 3400N
Static axial stiffness, preload class C  305N/µm
Preload class DGD 6800N
Static axial stiffness, preload class D  437N/µm
Calculation factors
Calculation factorf 1.09 
Calculation factorf1 1 
Calculation factorf2A 1 
Calculation factorf2B 1.01 
Calculation factorf2C 1.03 
Calculation factorf2D 1.05 
Calculation factorfHC 1 
Calculation factorf0 15.2 
Mass
Mass bearing  8.14kg
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Hot number: 12x19x5 HMS5 RG1 25590/25523 408403 6379/K-6320 6738 9847 K 81244 M HE 3130 L HE 320 NNTR 130x310x146.2ZL PCMF 081009.5 E S7003 CE/P4A S7017 CB/HCP4A W 619/6 R-2RS1 WS 89432

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