Needle Roller Bearings - Ntn-snr.com

Bearing Accuracy
NTN
Table 4.4 Tolerances of thrust roller bearings
Table 4.4 (1) Inner rings and center rings
Nominal bore diameter
d or d2
over
18
30
50
80
120
180
250
315
400
500
incl.
18
30
50
80
120
180
250
315
400
500
630
Allowable deviation of mean diameter
∆dmp or ∆d2mp
Class 0, 6, 5
Class 4
low high low
high
0
0
0
0
0
0
0
0
0
0
0
8
10
12
15
20
25
30
35
40
45
50
0
0
0
0
0
0
0
0
0
0
0
7
8
10
12
15
18
22
25
30
35
40
Allowable variation of
bore diameter
Vdp or Vd2p
Class 0, 6, 5 Class 4
lo w
6
8
9
11
15
19
23
26
30
34
38
5
6
8
9
11
14
17
19
23
26
30
10
10
10
10
15
15
20
25
30
30
35
5
5
6
7
8
9
10
13
15
18
21
3
3
3
4
4
5
5
7
7
9
11
m
Allowable variation of raceway thickness
1
Si
Class 0 Class 6 Class 5 Class 4
max
2
2
2
3
3
4
4
5
5
6
7
1 The complex bearings are applicable to the category of single plane bearing d which corresponds to the same nominal outer diameter of same diameter
series, without being applicable to d2 category.
Table 4.4 (2) Outer rings
m
Nominal outer
diameter
D
mm
over
incl.
Allowable deviation of mean outer diameter
∆Dmp
Class 0,6,5
Class 4
high low high low
Allowable variation
of outer diameter
VDp
Class 0,6,5
Class 4
max
Allowable variation ofraceway
thickness
Se
Class 0,6,5,4
max
10
18
30
18
30
50
0
0
0
11
13
16
0
0
0
7
8
9
8
10
12
5
6
7
50
80
120
180
250
315
80
120
180
250
315
400
0
0
0
0
0
0
19
22
25
30
35
40
0
0
0
0
0
0
11
13
15
20
25
28
14
17
19
23
26
30
8
10
11
15
19
21
Depending on the applicable allowable value
of S1 for d or d2 of same bearing.
400
500
630
500
630
800
0
0
0
45
50
75
0
0
0
33
38
45
34
38
55
25
29
34
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