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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 |
|
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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) |
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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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