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 6000 SERIES
 6200 SERIES
 6300 SERIES
 6800-6900 SERIES
 R SERIES
 1600 SERIES
 4200、4300 SERIES DOUBLE ROW DEEP GROOVE BALL BEARINGS
 5200、3200、5300、3300 SERIES DOUBLE ROW ANGULAR CONTACT BEARINGS
 120 SERIES
 130、2200、2300 SERIES
 3000 SERIES DOUBLE ROW ANGULARCONTACT BEARINGS
 4600、PC SERIES AUTOMOBILE AIR
 LFR SERIES HIGH-PRECISION TRACK ROLLERS BEARINGS
 SG SERIES LINE TRACK ROLLERS
 VW SERIES LINE TRACK ROLLERS BEARING
 LV SERIES
 WIRE GUIDES AND STRAIGHTENING ROLLERS - TYPE A OR AT
 LR SERIES
 LR5200 SERIES
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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 steelAISI304, 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
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