| |
| 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 |
≤
0.027 |
≤0.02 |
<0.23 |
≤0.25 |
≤0.1 |
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 |
|
|
