| MATERIAL: |
Usually rings and balls are made with the
material of is GCr15 basic electric high carton chromium
bearing steel( equivalent of JIS G 4805 SUJ2 steel)as
well as stainless steel 9Cr18(AISI440) and beryllium
Bronze. The cages are usually punch-pressed from brass
strips H62 or steel 08,SPCC,or stainless 3Cr13,1Cr18Ni9,and
fiber reinforced phenolic resin ,plastics,copper stock,
Sheals are made with the material of steel 10 or 08AI,SPCC,stainless
steel 1Cr18Ni9 The seals are made with the material
of synthetic rubber and Teflon. |
The
chemical composition of the material(GCr15)
|
C |
Cr |
P |
Mn |
Si |
S |
| GCr15 |
0.95-1.05 |
1.3-1.65 |
<=0.27 |
0.2-1.4 |
0.15-0.35 |
<=0.02 |
| 9Cr18 |
0.90-1.05 |
<0.8 |
<0.8 |
<0.04 |
<0.03 |
16-19 |
|
| HARDNESS
OF MATERIAL |
The hardness of bearing rings are HRC61-65,The
ball are HRC62-66.
|
| BEARING
TOLERANCE: |
Usually, the tolerance of
our products are ABEC1 without specifying. Please
select the exact tolerance you want when order, the
comparison table is made as following for reference!
| Standard |
Classification
of tolerance |
| ANSI |
ABEC1 |
ABEC
3 |
ABEC
5 |
ABEC
7 |
| SKF |
0 |
P6 |
P5 |
P4 |
| GB307-84 |
G |
E |
D |
C |
| GB/T307-94 |
0 |
6 |
5 |
4 |
| ISO |
0 |
6 |
5 |
4 |
| JIS |
P0 |
P6 |
P5 |
P4 |
| DIN |
P0 |
P6 |
P5 |
P4 |
|
| RADIAL
INTERNAL CLEARANCE: |
The radial internal clearance
of our products is same as the value of GB/T4604-93(equivalent
of ISO 5753-1991),usually, the clearance of our products
is basic group(Co group), as well as other clearance
at your request,the clearance can be divided the following
group.
|
Bore
Diameter |
Group
|
Normal
|
Group
|
Group
|
|
d
(mm) |
2
|
Group
|
3
|
4
|
|
over
to |
min
|
max
|
min
|
max
|
min
|
max
|
min
|
max
|
|
2.5 6 |
0
|
7
|
2
|
13
|
8
|
23
|
-
|
-
|
|
6 10 |
0
|
7
|
2
|
13
|
8
|
23
|
14
|
29
|
|
10---18
|
0 |
9 |
3 |
18 |
11 |
25 |
18 |
33 |
|
| PACKAGE |
Usually ten pieces in one plastic tube,ten
tubes in one box. As well as customers request.
|
| SHIELDS |
The shields could be ZZ(white metal),2RS(rubber
seals),2TS(Teflon seal) and SPCC. |
