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Materials and Accuracy Inspection and test
Vibration and Noise Lubrication
Bearing Specifications  
Bearing ring and ball are adopted with GCr15 to be made.
The Chemical of Bearing Steel No.of each country.See Table 1.
The preserving Shelf generally adoption H62 Brass Sheet of 0.8F cold rolling steel strap.punching to be made,also having plastics,phasics,phenol Aldehyde and presserving shelf.
Country
China
ISO
U.S.A
Germany
Japan
Sweden
Bearing Steel No.
GCr15
683/XVII1
(AISI)52100
(Din)100Cr6
(Jis)SUJ2
SKF3
According to the International Standard,the Accuracy of Bearing can be divided into five grades:normal Grade 0.High Grade 6.Accurate grade 5.Over Accuracy Grade 4.and over the 4th grade2.
The grade of tolerance is in accordance with the standard of GB/T307.1-94.
The contrast of Bearing Accuracy See Table 2.
Country
Standard
Accuracy Grade    
China
GB307.1
0
6
5
4
2
International Standard Organization
ISO
0
P6
5
4
2
Sweden
SKF
P0
P6
P5
P4
P2
Germany
DIN
P0
P6
P5
P4
P2
Japan
JIS
P0
P6
P5
P4
P2
U.S.A
ANSI
ABEC1
ABEC3
ABEC5
ABEC7
ABEC9

Radial Clearances
The radial clearances of our bearings can be classified into C2£¬C3£¬C4&C5 according to customer's request.

TABLE OF RADIAL CLEANANCE(UM)
Bore Diameter
 C2
 Standard
 C3
 C4
 C5
over
to
min
max
min
max
min
max
min
max
min
max
2.5
6
0
7
2
13
8
23
-
-
-
 
6
10
0
7
2
13
8
23
14
29
20
37
10
18
0
9
3
18
11
25
18
33
25
45
18
24
0
10
5
20
13
28
20
36
28
48
24
30
1
11
5
20
13
28
23
41
30
53
30
40
1
11
6
20
15
33
28
46
40
64