RINGS
& BALLS--- Bearing Experts uses SAE 52100 vacuum
degassed, high carbon, chromium
bearing steel as its
standard material for precision bearing rings and balls. In applications where a
corrosive environment may be
present, we recommend the use of AISI 440 C martensitic stainless
steel.
Table
1 below shows the chemical compositions of chromium bearing steel:
Country |
Standard |
Symbol |
Chemical compositions (%) |
||||||
C |
Si |
Mn |
P |
S |
Cr |
Mo |
|||
|
ASTMA295 |
52100 |
0.98-1.10 |
0.15-0.35 |
0.25-0.45 |
≤ 0.025 |
≤ 0.025 |
1.30-1.60 |
≤ 0.10 |
|
GB/T18254 |
GCr15 |
0.95-1.05 |
0.15-0.35 |
0.25-0.45 |
≤ 0.025 |
≤ 0.025 |
1.40-1.65 |
≤ 0.10 |
|
JISG4805 |
SUJ2 |
0.95-1.10 |
0.15-0.35 |
≤ 0.50 |
≤ 0.025 |
≤ 0.025 |
1.30-1.60 |
≤ 0.08 |
|
DIN |
100Cr6 |
0.95-1.05 |
0.15-0.35 |
0.25-0.45 |
≤ 0.025 |
≤ 0.025 |
1.40-1.65 |
≤ 0.10 |
|
D33 |
SKF3 |
0.95-1.10 |
0.15-0.35 |
0.25-0.45 |
≤ 0.025 |
≤ 0.015 |
1.35-1.65 |
≤ 0.10 |
|
KSD3525 |
STB2 |
0.95-1.10 |
0.15-0.35 |
≤ 0.50 |
≤ 0.025 |
≤ 0.025 |
1.30-1.60 |
≤ 0.08 |
RETAINERS---
Bearing Experts standard bearing retainers are made from cold rolled carbon
steel.
However, in case of
corrosive environment, misalignment, or high speed operation, stainless steel,
nylons,
or phenolic resins can be
used upon request.
SEALS
& SHIELDS--- Bearing Experts shields also employ carbon
steel as standard, and the option of AISI300
stainless steel is available
when needed. Bearing Experts uses a variety of sealing materials to meet the
requirements of high
temperature operation and compatibility with greases. Nitrile rubber is the
standard material used,
while fluorocarbon, silicon, and Teflon seals are commonly specified for
high temperature running.
LUBRICANTS--- Bearing Experts standard greases are listed below in TABLE 2 and are supplied with
shield or sealed bearings as standard. Many different types of oil lubricants can also be supplied upon
request, and are supplied as standard for open
bearings.
Manufacturers |
Lubricants |
Operating temperature |
|
|
C |
F |
|||
GREASES
|
||||
SHELL |
ALVANIA
RS#2 |
-25 / +120 |
-13 / +248 |
|
EXXON(ESSO) |
BEACON 325 |
-55 / +120 |
-67 / +248 |
MIL-G-3278A |
|
ANDOK C |
-25 / +120 |
-13 / +248 |
|
|
ANDOK B |
-30 / +110 |
-22 / +230 |
MIL-G-18709A |
MOBIL |
GREASE 28 |
-60 / +175 |
-76 / +347 |
MIL-G-81322A |
CHEVRON |
CHEVRON
SRI#2 |
-30 / +175 |
-22 / +347 |
|
DOW CORNING |
DC 33 |
-70 / +180 |
-94 / +356 |
MIL-G-46886 |
DUPONT |
KRYTOX
240AB |
-40 / +227 |
-40 / +440 |
MIL-G-38220 |
KYODO YUSHI |
MULTEMP
SRL |
-40 / +150 |
-40 / +302 |
|
KYODO YUSHI |
MULTEMP
PS2 |
-54 / +130 |
-65 / +266 |
|
|
HANGU
GREASE |
-20 / +
120 |
-04 / +248 |
|
The bearing accuracy includes dimensional accuracy and running accuracy, which has corresponding domestic and international standard, but the domestic standards of all countries accord with the international standard. TABLE 3 shows the radial ball bearing accuracy grade.
TABLE 3
COUNTRY |
STANDARD |
ACCURACY GRADE |
||||
|
ANSI/AFBMA
STD.20 |
ABEC-1 |
ABEC-3 |
ABEC-5 |
ABEC-7 |
ABEC-9 |
INTERNATIONAL |
ISO 492 |
CLASS 0 |
CLASS 6 |
CLASS 5 |
CLASS 4 |
CLASS 2 |
|
GB/T307.1 |
|
P6 |
P5 |
P4 |
P2 |
|
JIS B 1514 |
0 |
6 |
5 |
4 |
2 |
|
DIN 620 |
P0 |
P6 |
P5 |
P4 |
P2 |
The internal clearance of bearings refers to the value of displacement of the unfixed ring when it moves against the fixed ring in radial or axial direction, it can be classified into radial clearance and axial clearance. Generally, the radial clearance is controlled for deep groove ball bearings, while the axial clearance is controlled for double row angular contact ball bearings. TABLE 4 shows the clearance for radial deep groove ball bearings.
TABLE 4
Bore
(d) |
C2 |
C0 |
C3 |
C4 |
C5 |
||||||
> |
≤ |
min |
max |
min |
max |
min |
max |
min |
max |
min |
max |
2.5 |
10 |
0 |
7 |
2 |
13 |
8 |
23 |
14 |
29 |
20 |
37 |
10 |
18 |
0 |
9 |
3 |
18 |
11 |
25 |
18 |
33 |
25 |
45 |
18 |
24 |
0 |
10 |
5 |
20 |
13 |
28 |
20 |
36 |
28 |
48 |
24 |
30 |
1 |
11 |
5 |
20 |
13 |
28 |
23 |
41 |
30 |
53 |
30 |
40 |
1 |
11 |
6 |
20 |
15 |
33 |
28 |
46 |
40 |
64 |
40 |
50 |
1 |
11 |
6 |
23 |
18 |
36 |
30 |
51 |
45 |
73 |
50 |
65 |
1 |
15 |
8 |
28 |
23 |
43 |
38 |
61 |
55 |
90 |
65 |
80 |
1 |
15 |
10 |
30 |
25 |
51 |
46 |
71 |
65 |
105 |
80 |
100 |
1 |
18 |
12 |
36 |
30 |
58 |
53 |
84 |
75 |
120 |
Bearing Experts bearings
have been cleaned, rust-prevented and packaged before delivery to
customers. Under normal
storage conditions, the bearings will not get rusted within one year after delivery.
Bearing Experts bearing packaging consists of interior package and outer package. Interior package is oilpaper or plastic tube, outer package is carton lined with plastic sheet. The package for ocean transportation is wooden pallet or iron pallet wrapped with plastic sheet and packed with metal strips. Individual box packaging or other modes are also available upon request.
v. WARRANTYBearing Experts bearings are warranted to be free from defects in materials and workmanship. The obligation of Bearing Experts under this warranty is limited to replacing any bearing which is proven to be defective within 180 days from date of purchase, under the following provisions.
1. The application of the product was approved by Bearing Experts.
2. Analysis by Bearing Experts verified that the product was properly handled, mounted,
3. Lubricated and not subjected to abuse.