The rings and balls of YYXF bearing are made from chrome steel GCr15(AISI52100-USD) or stainless steel 9Cr18(AISI400-USD),The retainer of it is normally made from low carbon steel 08F,If required,it also made from nylon,fiber reinforced phenolic resin,plastics or other stocks.

The chemical composition of bearing steel are shown on follow table

Steel No.
Chemical Composition (%)
C
Si
Mn
P
S
Cr
GCr15
0.95-1.05
0.15-0.35
0.25-0.45
¡Ü 0.025
¡Ü 0.025
1.40-1.65


The tolerance for the boundary dimensions and running accuracy of bearing are specified by GB/T307 & USA standard as below.

Standard code
Accuracy Class
GB307
P0
P6
P5
P4
P2
ANSI
ABEC1
ABEC3
ABEC5
ABEC7
ABEC9
ISO
Normal class
Class 6
Class 5
Class4
Class 2



Inner Ring

d mm
¡÷dmp
Vdp
Diameter series
Vdmp
Kia
¡÷BS
VBS
9
0,1
2,3,4
over
incl.
high
low
Max.
max.
max.
high.
low
max.
0.6
2.5
0
-8
10
8
6
6
10
0
-40
12
2.5
10
0
-8
10
8
6
6
10
0
-120
15
10
18
0
-8
10
8
6
6
10
0
-120
20
18
30
0
-10
13
10
8
8
13
0
-120
20
30
50
0
-12
15
12
9
9
15
0
-120
20

Outer Ring

d mm
¡÷dmp
Vdp
Vdmp
Kia
¡÷BS
VBS
Open Bearings
Capped Bearings
9
0,1
 2,3,4
2,3,4
over
incl.
high
low
Max.
max.
max.
max.
low
max.
2.5
6
0
-8
10
8
6
10
6
15
Identical to ¡÷Bs and VBS of inner ring of same bearing
6
18
0
-8
10
8
6
10
6
15
18
30
0
-9
12
9
7
12
7
15
30
50
0
-11
11
11
8
16
8
20
50
80
0
-13
16
13
10
20
10
25
80
120
0
-15
19
19
11
26
11
35

Bearing Internal Clearance

Bore
C2
Co Normal
C3
C4
C5
Over
Including
mm
Inch
mm
Inch
min
max
min
max
min
max
min
max
min
max
2.5
10
.0984
.3937
10
18
.3937
.7087
0
0
7
9
2
3
13
18
8
11
23
25
14
18
29
33
20
25
37
45
18
24
.7087
.9449
24
30
.9449
1.1811
0
1
10
11
5
5
20
20
13
13
28
28
20
23
36
41
28
30
48
53
30
40
1.1811
1.5748
40
50
1.5748
1.9685
1
1
11
11
6
6
20
23
15
18
33
36
28
30
46
51
40
45
64
73

Vibration and Noise
YYXF bearing have the feature of low noise and small vibration; At present,we make the testing for extra small and small ball bearings normally use S0910 and BVT-1 testing equipment.

Bore
(mm)
S0910-1(dB)
BVT-1(um/s)
Z1¡Ü
Z2¡Ü
Z3¡Ü
V1¡Ü
V2¡Ü
V3¡Ü
L
M
H
L
M
H
L
M
H
4
35
33
31
90
60
50
58
36
30
35
21
18
5
36
34
32
90
60
50
58
36
30
35
21
18
6
36
34
32
90
60
50
58
36
30
35
21
18
7
37
34
32
110
80
65
72
48
40
44
28
24
8
38
35
33
110
80
65
72
48
40
44
28
24
9
40
36
34
110
80
65
72
48
40
44
28
24
10
41
38
35
140
100
85
90
60
50
55
35
30
12
43
39
35
140
100
85
90
60
50
55
35
30
15
44
40
35
180
130
100
110
78
60
65
46
35
17
45
41
36
180
130
100
110
78
60
65
46
35
20
46
42
37
220
160
125
130
100
75
80
60
45
25
47
44
40
220
160
125
130
100
75
80
60
45
30
48
43
41
250
200
160
150
120
100
90
75
60
35
49
45
43
250
200
160
150
120
100
90
75
60


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