| ACCURACY |
| The accuracy of WT bearings is
in accordance with GB/T307-94, our national standard.
It is classified in 2 4 5 6 and 0, five grades. Below
the following is the comparison between Chinese standard
and ISO standard, etc. |
| Standard |
Accuracy |
| GB/T307-94 |
2 |
4 |
5 |
6 |
0 |
| ISO |
CLASS2 |
CALSS4 |
CLASS5 |
CLASS6 |
NORMAL CLASS |
| DIN |
P2 |
P4 |
P5 |
P6 |
P0 |
| ANSI |
ABEC9 |
ABEC7 |
ABEC5 |
ABEC3 |
ABEC1 |
| JIS |
JIS2 |
JIS4 |
JIS5 |
JIS6 |
JIS0 |
|
| The tolerance of 0 grade / ABEC1
is as follows: |
| INNER RINGS |
UNIT:µm |
| d (mm) |
¡÷dmp |
Vdp |
Vdmp |
Kia |
¡÷Bs |
Vbs |
| 9 |
0, 1 |
2, 3,4 |
| over |
to |
max |
min |
max |
max |
max |
max |
min |
max |
| 2.5 |
10 |
0 |
-8 |
10 |
8 |
6 |
6 |
10 |
0 |
-120 |
15 |
| 10 |
18 |
0 |
-8 |
10 |
8 |
6 |
6 |
10 |
0 |
-120 |
20 |
| 18 |
30 |
0 |
-10 |
13 |
10 |
8 |
8 |
13 |
0 |
-120 |
20 |
|
| OUTER RING |
UNIT:µm |
| D (mm) |
¡÷Dmp |
VDp |
VDmp |
Kia |
¡÷Bs |
Vbs |
| 9 |
0, 1 |
2, 3,4 |
| over |
to |
max |
min |
max |
max |
max |
max |
min |
max |
| 6 |
18 |
0 |
-8 |
10 |
8 |
6 |
6 |
15 |
0 |
-120 |
15 |
| 18 |
30 |
0 |
-9 |
12 |
9 |
7 |
7 |
15 |
0 |
-120 |
20 |
| 30 |
50 |
0 |
-11 |
14 |
11 |
8 |
8 |
20 |
0 |
-120 |
20 |
|
| The WT tolerance of 6 grade /
ABEC3 is as follows |
| INNER RING |
UNIT:µm |
| d (mm) |
¡÷Dmp |
VDp |
VDmp |
Kia |
¡÷Bs |
Vbs |
| 9 |
0, 1 |
2, 3,4 |
| over |
to |
max |
min |
max |
max |
max |
max |
min |
max |
| 2.5 |
10 |
0 |
-7 |
9 |
7 |
5 |
5 |
5 |
0 |
-120 |
15 |
| 10 |
18 |
0 |
-7 |
9 |
7 |
5 |
5 |
7 |
0 |
-120 |
20 |
| 18 |
30 |
0 |
-8 |
10 |
8 |
6 |
6 |
8 |
0 |
-120 |
20 |
|
| OUTER RING |
UNIT:µm |
| d (mm) |
¡÷Dmp |
VDp |
VDmp |
Kia |
¡÷Bs |
Vbs |
| 9 |
0, 1 |
2, 3,4 |
| over |
to |
max |
min |
max |
max |
max |
max |
min |
max |
| 6 |
18 |
0 |
-7 |
9 |
7 |
5 |
5 |
8 |
0 |
-120 |
15 |
| 18 |
30 |
0 |
-8 |
10 |
8 |
6 |
6 |
9 |
0 |
-120 |
20 |
| 30 |
50 |
0 |
-9 |
11 |
9 |
7 |
7 |
10 |
0 |
-120 |
20 |
|
| The above tolerances are based
on open type.WT owns the technology to produce bearings
with 5 grade/ABEC5 for you. |
