Bearing Precision & Radial Clearance
 
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Bearing precision Grades
Standards Precision Grade
China standard GB G E D C B
international standard lSO Normal Class Class 6 Class 5 Class 4 Class 2
American standard ANSl ABEC 1 ABEC 3 ABEC 5 ABEC 7 ABEC 9
Germany Standard DlN P0 P6 P5 P4 P2
Japan Standard Jls Class0 Class 6 Class 5 Class 4 Class 2

Deep Groove Bearing Radial Clearance
Nominal Bore Over 2.5 6 10 18 24 30 40 50 65 80 100 120 140 160
d=mm to 6 10 18 24 30 40 50 65 80 100 120 140 160 180
Group min 0 0 0 0 1 1 1 1 1 1 2 2 2 2
C2 max 7 7 9 10 11 11 11 15 15 18 20 23 23 25
Normal Group min 2 2 3 5 5 6 6 8 10 12 15 18 18 20
CN max 13 13 18 20 20 20 23 28 30 36 41 48 53 61
Group min 8 8 11 13 13 15 18 23 25 30 36 41 46 53
C3 max 23 23 25 28 28 33 36 43 51 58 66 81 91 102
Group min   14 18 20 23 28 30 38 46 53 61 71 81 91
C4 max   29 33 36 41 46 51 61 71 84 97 114 130 147

Chemical composition of bearing steel Gcr15
Element(wt%) C
0.95-1.05
Cr
1.40-1.65
Si
0.15-0.35
Mn
0.25-0.45
P
0.027
S
0.02
Element(wt%) Ni
0.23
Cu
0.25
Mo
0.1
Sn
0.03
As
0.04
Ti
0.005
Element(wt%) Sb
0.002
Pb
0.002
O
0.001
Al
0.05
Ca
0.01
 

Corresponding essignation equivalent GCr15
CHINA lSO USA GERMANY JAPAN SWEDEN
GCr15 683/xvII 52100(ASTM 100Cr6(DlN SUJ2(JlS) SKF3

Stainless steel
Steel Number

AlSl-440C
Chemical  composition%
C Si Mn P S Cr Mo
0.95-1.2 1.0 1.0 0.04 0.03 16-18 0.75
 
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