NTN - Needle Roller Bearings

Bearing Accuracy
NTN
Table 4.3 Tolerances for radial bearings
Table 4.3(1) Inner rings
Nominal bore
diameter
over
120
150
180
250
315
400
d
mm
2.5 1
10
18
30
50
80
incl.
10
18
30
50
80
120
150
180
250
315
400
500
Dimensional tolerance for mean bore diameter
∆dmp
Class 0 Class 6
Class 5 Class 4
high low high low high low high low
0
0
0
0
0
0
0
0
0
0
0
0
8
8
10
12
15
20
25
25
30
35
40
45
0
0
0
0
0
0
0
0
0
0
0
0
1 2.5mm is included in this dimensional category.
2 This table is applied to the ball bearings.
7
7
8
10
12
15
18
18
22
25
30
35
0
0
0
0
0
0
0
0
0
0
0
5
5
6
8
9
10
13
13
15
18
23
0
0
0
0
0
0
0
0
0
4
4
5
6
7
8
10
10
12
Class
0
10
10
13
15
19
25
31
31
38
44
50
56
Variation of mean
bore diameter
9
9
10
13
15
19
23
23
28
31
38
44
Vdp
Class Class
6 5
max
5
5
6
8
9
10
13
13
15
18
23
Class
4
4
4
5
6
7
8
10
10
12
Allowable variation of
bore diameter
Class
0
6
6
8
9
11
15
19
19
23
26
30
34
Vdmp
Class Class
6 5
max
5
5
6
8
9
11
14
14
17
19
23
26
3
3
3
4
5
5
7
7
8
9
12
Class
4
2
2
2.5
3
3.5
4
5
5
6
Table 4.3 (2) Outer rings
Nominal outer
diameter
over
D
mm
incl.
Dimensional tolerance for mean outer diameter
∆Dmp
Class 0 Class 6
Class 5 Class 4
high low high low high low high low
Allowable variation of
outer diameter
Class
0
VDp
Class Class
6 5
max.
Class
4
Allowable variation of
mean outer diameter
Class
0
VDmp
Class Class
6 5
max.
Class
4
6
18
30
3
18
30
50
0
0
0
8
9
11
0
0
0
7
8
9
0
0
0
5
6
7
0
0
0
4
5
6
10
12
14
9
10
11
5
6
7
4
5
6
6
7
8
5
6
7
3
3
4
2
2.5
3
50
80
120
80
120
150
0
0
0
13
15
18
0
0
0
11
13
15
0
0
0
9
10
11
0
0
0
7
8
9
16
19
23
14
16
19
9
10
11
7
8
9
10
11
14
8
10
11
5
5
6
3.5
4
5
150
180
250
180
250
315
0
0
0
25
30
35
0
0
0
18
20
25
0
0
0
13
15
18
0
0
0
10
11
13
31
38
44
23
25
31
13
15
18
10
11
13
19
23
26
14
15
19
7
8
9
5
6
7
315
400
500
400
500
630
0
0
0
40
45
50
0
0
0
28
33
38
0
0
0
20
23
28
0
15
50
56
63
35
41
48
20
23
28
15
30
34
38
21
25
29
10
12
14
8
1 6mm is included in this dimensional category.
2 This table is applied to the ball bearings.
A-26