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Material
¡¡¡¡the rings and balls of NLHB bearings are made of refined high carbon chrome bearing steel GCr15(AISI52100) or stainless steel 9Cr18(AISI 440C).The retainer is punch-pressed from brass strip(H62), high quality cold-rolled steel strip(08) or SPCC(BQB402) and stainless steel£¨AISI304£©, and reinforced engineering plastics or other material is available if necessary. The shield is made of steel strip 10,08AI, SPCC(JISG3141) or stainless steel £¨1Cr18Ni9,AISI304£©.The seal is hot-pressed fromoil-resistant bune-N rubber with phosphorated steel skeleton.
The chemical composition of bearing steel Gcr15
Table 1
Gcr15
C
Cr
Si
Mn
P
S
Ni
Cu
Mo
Wt%
0.95-
1.05
1.40-
1.65
0.15-
0.35
0.25-
0.45
¡Ü
0.027
¡Ü0.02
<0.23
¡Ü0.25
¡Ü0.1
GCr15
Sn
As
Ti
Sb
Pb
0
Al
Ca
Wt%
<0.03
<0.04
<0.005
<0.002
<0.002
<0.001
<0.05
<0.01
Corresponding designation equivalent to GCr15
Table 2
CHINA
ISO
U.S.A
GERMANY
JAPAN
SWEDEN
FRANCE
Gcr15
683/XVII
52100
(AISI)
100Cr6
(DIN)
SUJ2
(JIS)
SKF3
100C6
(NF)
Accuracy
¡¡¡¡Bearing' s precision means dimension accuracy and running accuracy. International grade of bearing is divided into: P0 , P6 , P5 , P4 , P2 , and or equivalently adopts ISO standard. Different precision grade'scomparison see as follows:
Comparison table of accuracy grade
Talbe 3
Country
Standard
Accuracy Grade
China
GB307-84
B
C
D
E
G
China
GB/T307.1-94
2
4
5
6
0
International
Standard
Organization
ISO
2
4
5
6
0
Japan
JIS
2
4
5
6
0
U.S.A
ANSI
ABEC9
ABEC7
ABEC5
ABEC3
ABEC1
Germany
DIN
P2
P4
P5
P6
0
Sweden
SKF
P2
P4
P5
P6
0
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