NTN - Precision Rolling Bearings

NTN Main Spindle Bearings
5 Accuracy of high-speed duplex angular contact ball bearings for axial loads
Table 11.5 Inner rings
Nominal bore
diameter
d
over incl.
18
30
50
80
120
150
180
250
315
30
50
80
120
150
180
250
315
400
Overall width
variation of
assembled bearing
ΔBs
Class 5 Class 4
high low
Single radial plane bore
Single plane mean bore
Class 5 Class 4 1 Class 5 Class 4 Class 5 Class 4
diameter deviation
Δdmp
diameter variation
Vdsp
Diameter series 9 Diameter series 0
high low high low max
max
0
0
0
0
0
0
0
0
0
6
8
9
10
13
13
15
18
23
Width variation
VBs
Class 5 Class 4
max
0
0
0
0
0
0
0
0
0
5
6
7
8
10
10
12
14
16
Unit:
Nominal bore
diameter
d
over incl.
6
8
9
10
13
13
15
18
23
5
6
7
8
10
10
12
14
17
5
6
7
8
10
10
12
14
18
4
5
5
6
8
8
9
11
12
Mean bore Perpendicularity of
diameter deviation inner ring face with
Vdmp respect to the bore
Sd
Class 5 Class 4 Class 5 Class 4
max
max
3
4
5
5
7
7
8
9
12
2.5
3
3.5
4
5
5
6
8
9
8
8
8
9
10
10
11
13
15
4
4
5
5
6
6
7
8
10
Unit:
Axial runout
Sia
Class 5 Class 4
max
5
5
6
6
8
8
8
10
13
3
3
5
5
6
6
6
8
10
1The tolerance of bore diameter deviation Δds is the same as the tolerance of single plane
mean bore diameter deviation Δdmp.
0
0
0
240
240
300
5
5
6
2.5
3
4
18
30
50
30
50
80
0
0
0
400
500
500
7
8
8
4
5
5
80
120
150
120
150
180
0
0
0
600
700
800
10
13
15
6
8
10
180
250
315
250
315
400
Table 11.6 Outer rings
Nominal bore
diameter
D
Single plane mean outside diameter deviation
ΔDmp
and outside diameter deviation
ΔDs
Class 5L or Class 4L 2 Class 5
Class 4 2
over incl. high low high low high low
Axial runout
Sea
Class 5 Class 4
All classes
Overall width variation
of assembled bearing
ΔCs
All classes
Unit:
Width variation
VCs
Class 5 Class 4
max
30
50
80
50
80
120
25
30
36
36
43
51
0
0
0
7
9
10
0
0
0
6
7
8
8
10
11
5
5
6
Identical to Bs
relative to d on
the same bearing.
5
6
8
2.5
3
4
120
150
180
150
180
250
43
43
50
61
61
70
0
0
0
11
13
15
0
0
0
9
10
11
13
14
15
7
8
10
8
8
10
5
5
7
250
315
400
315
400
500
56
62
68
79
87
95
0
0
0
18
20
23
0
0
13
15
18
20
23
10
13
15
11
13
15
7
8
10
2The tolerance of outside diameter deviation ΔDs to be applied to the Class 4 and Class 2 is same as the tolerance of the mean outside diameter deviation Δdmp.
Note that the Class 4 is applicable to diameter series 0 and 2, and the Class 2 is applicable to all the diameter series.
Note: This standard is the NTN standard.
239