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Clearance
  Bearing internal clearance is defined as the total distance through which one bearing ring can be moved relative to the other. The operational clearance of a bearing has great influence on the running condition, life, vibration level, noise value,and the rmal expansion of bearing.Following table give the clearance for the various bearing types in the conditions of without pre-load
Table 4 Clearance
Unit:μm
Bore(d)
C2
Co
Normal
C3
C4
C5
Over
Incl
mm
mm
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
40
50
1
11
6
23
18
36
30
51
45
73
50
65
1
15
8
28
23
43
38
61
55
90
Note:C2 group clearance only for bearings over 6 grade accuracy.
ibration and Noise
   The vibration and noise of bearings are classified in three classes as Z1、Z2 and Z3,it is measured by the instrument of SO910-1. For special requirement,it is measured by BVT-1 and classified as V1、V2 and V3.
Table 5
Bore
(mm)
S0901-(dB)
BVT-1(μm/s)
Z1
Z2
Z3
V1+
V2+
V3+
Low
Medium
High
L
M
H
L
M
H
4
34
32
28
90
60
50
58
36
30
35
21
18
5
36
34
30
90
60
50
58
36
30
35
21
18
6
36
34
30
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
40
51
46
44
300
250
220
180
150
130
110
90
80
45
53
48
45
300
250
220
180
150
130
110
90
80
50
54
50
47
350
270
270
210
160
160
125
100
100
55
56
52
49
350
300
300
210
180
180
125
110
110
60
58
54
51
400
300
370
240
180
220
145
110
130
 
 
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