Needle Roller Bearings - Ntn-snr.com

Bearing Accuracy
NTN
Table 4.5 Allowable critical value for chamfering dimension
Table 4.5 (1) Radial bearings
mm
Nominal bore diameter
rs min 1
d
Radial direction Axial direction
over incl. rs max
0.15
0.2
0.3
0.6
1
1.1
1.5
2
2.1
2.5
3
40
40
50
120
120
80
220
280
100
280
280
40
40
50
120
120
80
220
280
100
280
280
0.3
0.5
0.6
0.8
1
1.3
1.5
1.9
2
2.5
2.3
3
3
3.5
3.8
4
4.5
3.8
4.5
5
5
5.5
0.6
0.8
1
1
2
2
3
3
3.5
4
4
5
4.5
5
6
6.5
7
6
6
7
8
8
6.5
9
1 Allowable minimum values for the chamfering dimension "r" .
Bearing bore surface
(or outer surface)
Table 4.5 (2) Thrust bearings
rs min 1
rs min
rs max
rs min
Axial direction
Inner ring side face
(or outer ring side face)
0.3
0.8
0.6
1.5
1
2.2
1.1
2.7
1.5
3.5
2
4
2.1
4.5
3
5.5
1 Allowable minimum values for the chamfering dimension "r" .
rsmin
rsmax
Radial and axial directions
rs max
Radial direction
mm
Table 4.6 Basic tolerances
m
Basic dimension
IT basic tolerance classes
(mm)
over incl. IT1 IT2 IT3 IT4 IT5 IT6 IT7 IT8 IT9 IT10
3
6
3
6
10
0.8
1
1
1.2
1.5
1.5
2
2.5
2.5
3
4
4
4
5
6
6
8
9
10
12
15
14
18
22
25
30
36
40
48
58
10
18
30
18
30
50
1.2
1.5
1.5
2
2.5
2.5
3
4
4
5
6
7
8
9
11
11
13
16
18
21
25
27
33
39
43
52
62
70
84
100
50
80
120
80
120
180
2
2.5
3.5
3
4
5
5
6
8
8
10
12
13
15
18
19
22
25
30
35
40
46
54
63
74
87
100
120
140
160
180
250
315
250
315
400
4.5
6
7
7
8
9
10
12
13
14
16
18
20
23
25
29
32
36
46
52
57
72
81
89
115
130
140
185
210
230
400
500
630
500
630
800
8
9
10
10
11
13
15
16
18
20
22
25
27
30
35
40
44
50
63
70
80
97
110
125
155
175
200
250
280
320
800
1 000
1 250
1 000
1 250
1 600
11
13
15
15
18
21
21
24
29
29
34
40
40
46
54
56
66
78
90
105
125
140
165
195
230
260
310
360
420
500
1 600
2 000
2 500
2 000
2 500
3 150
18
22
26
25
30
36
35
41
50
48
57
69
65
77
93
92
110
135
150
175
210
230
280
330
370
440
540
600
700
860
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