The accuracy of bearing made in accordance with
GB/T307-94 National standard is classified in 2, 4,5,6 and 0 five
grades. The table as below makes a comparison between this accuracy
grade with ISO standard, etc.
Standard |
Grade
of accuracy |
GB/T307-94 |
2(B) |
4(C) |
5(D) |
6(E) |
0(G) |
ISO |
2 |
4 |
5 |
6 |
0 |
ASA |
ABEC9 |
ABEC7 |
ABEC5 |
ABEC3 |
ABEC1 |
SKF |
P2 |
P4 |
P5 |
P6 |
0 |
The tolerances of standard grade
(0 grade) bearings are shown as following table.
INNER RING
| d
(mm) |
△dmp |
VDP |
∨dmp |
Kia |
△Bs |
VBs |
| Diameter
Series |
| 9 |
0,1 |
2,3,4 |
| over
|
incl
|
max
|
min
|
max |
max
|
max
|
max
|
min
|
max
|
| 10 |
18 |
0 |
-8 |
10 |
8 |
6 |
6 |
10 |
0 |
-120 |
20 |
| 18 |
30 |
0 |
-10 |
13 |
10 |
8 |
8 |
13 |
0 |
-120 |
20 |
| 30 |
50 |
0 |
-12 |
15 |
12 |
9 |
9 |
15 |
0 |
-120 |
20 |
| 50 |
80 |
0 |
-15 |
19 |
19 |
11 |
11 |
20 |
0 |
-150 |
25 |
| 80 |
120 |
0 |
-20 |
25 |
25 |
15 |
15 |
25 |
0 |
-200 |
25 |
OUTER RING
| D(mm) |
△Dmp |
VDp |
VDmp |
Kea |
△Cs |
VCs |
|
open |
closed |
| 9 |
0,1 |
2,3,4 |
2,3,4 |
| over |
incl |
max |
min |
max |
max |
max |
max |
min |
max |
| 18 |
30 |
0 |
-9 |
12 |
9 |
7 |
12 |
7 |
15 |
与同一轴承的△ |
| 30 |
50 |
0 |
-11 |
14 |
11 |
8 |
16 |
8 |
20 |
Bs及VBs相同 |
| 50 |
80 |
0 |
-13 |
16 |
13 |
10 |
20 |
10 |
25 |
as
same as △ Bs |
| 80 |
120 |
0 |
-15 |
19 |
19 |
11 |
25 |
11 |
35 |
and
VBs of that |
| 120 |
150 |
0 |
-18 |
23 |
23 |
14 |
30 |
14 |
40 |
bearing |
|
