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Accuracy Grade of Bearings |
Accruacy Grade Of Bearings |
C&U bearings are manufactured according to the relevant specifications of China's National Standards GB,which are equivalent to ISO standards.
Comparison Table of Accuracy Grade
Code name |
Accuracy grade |
GB |
0 |
6 |
5 |
4 |
2 |
ISO |
0 |
6 |
5 |
4 |
2 |
ANSI |
ABEC1 |
ABEC3 |
ABEC5 |
ABEC7 |
ABEC9 |
SKF |
P0 |
P6 |
P5 |
P4 |
P2 |
DIN |
P0 |
P6 |
P5 |
P4 |
P2 |
JIS |
0 |
6 |
5 |
4 |
2 |
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Bearing ring and rolling element materials |
High carbon chrome bearing steel is a ageneral and normally best material for bearing rings and rolling elements. Their chemical composition given below:
Chemical composition of bearing steel GCr15
element content
(wt%) |
C
0.95-1.05 |
Cr
1.40-1.65 |
Si
0.15-0.35 |
Mn
0.25--0.45 |
P
0.027 |
S
0.002 |
element content
(wt%) |
Ni
<0.23 |
Cu
0.25 |
Mo
0.1 |
Sn
<0.03 |
As
<0.04 |
Ti
<0.005 |
element content
(wt%) |
Sb
<0.002 |
Pb
<0.002 |
O
<0.0021 |
Al
<0.05 |
Ca
<0.01 |
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Corresponding designation equivalent to GCr15
China |
ISO |
USA |
Germany |
Japan |
Sweden |
GCr15 |
683/XVII |
52100(ASTM) |
100Cr6(DIN) |
SVJ2(JIS) |
SKF3 |
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Bearing Clearance |
Bearing interal clearance is defined as the total distance through which one bearing ring can be moved relative to the other. The operational clearance of a bearing has great influence on the running condition,life,vibration level,noise value,and thermal expansion of bearing.Following tables give the clearance for the various bearing types in the conditions of without preload.
Radial internal clearance of deep groove ball bearings(including cylindrical bore):
Bore
d(mm) |
Clearance |
C2 |
C0 |
C3 |
C4 |
C5 |
over |
to |
min. |
max. |
min. |
max. |
min. |
max. |
min. |
max. |
min. |
max. |
6
10 |
10
18 |
0
0 |
7
9 |
2
3 |
13
18 |
8
11 |
23
25 |
14
18 |
29
33 |
20
25 |
37
45 |
18
24
30 |
24
30
40 |
0
1
1 |
10
11
11 |
5
5
6 |
20
20
20 |
13
13
15 |
28
28
33 |
20
23
28 |
36
41
46 |
28
30
40 |
48
53
64 |
10
50
65 |
50
65
80 |
1
1
1 |
11
15
15 |
6
8
10 |
23
28
30 |
18
23
25 |
36
43
51 |
30
38
46 |
51
61
71 |
45
55
65 |
73
90
105 |
80
100
120 |
100
120
140 |
1
2
2 |
18
20
23 |
12
15
18 |
36
41
48 |
30
36
41 |
58
66
81 |
53
61
71 |
84
97
114 |
75
90
105 |
120
140
160 |
Note:When measuring the clearance,we should take into consideration of the extra clearance arisen from the measuring load.
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Lubricant Types |
CSR Code |
Brand Name |
Basic Type Grease |
Operating Temp.(degree) |
Uses |
L06 |
Exxon Beacon325 |
Synthetic grease |
-55~120 |
General purpose grease |
L01 |
Exxon
Andok B(Mil-G-18709 A) |
Channeling petroleum grease |
-30~95 |
Excellent high speed,low torque,light mass |
L02 |
Exxon Andok C |
Channeling petroleum grease |
-30~120 |
Smooth running,long life |
L80 |
G.E. Versilube G300 |
Silicone grease |
-75~205 |
Light loads and fine moderate speed |
L60 |
Mobil 28(Mil-G-81322) |
Synthetic hydrocarbon |
-55~180 |
Wide temperature range,good low temperature torque |
L19 |
Chevron SRI-2 |
Mineral grease |
-30~180 |
High temperature stability with good water resistance |
L15 |
Shell Alvania 2 |
Mineral grease |
-35~120 |
Long life and wide application |
L76 |
DuPon Krytox
240AC(mil-G-2761) |
Fluorinated grease |
-35~290 |
High temperature stability with good lubricity properties |
L31 |
Shell Dolium R |
Petroleum grease |
-40~150 |
Good corrosion resistance and water resistance |
L21 |
KYODO |
Synthetic grease |
-40~150 |
Low noise,low torque and special case |
L91 |
NIG-ACE W |
Synthetic grease |
-18~150 |
Low noise,low torque and special case |
L63 |
Mobil HP |
Lithium comples |
-30~110 |
vibration,moderate speeds and good corrosion resistance |
L08 |
Motor No.2 |
Mineral grease |
-30~110 |
Wide application, general purpose |
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Characteristics of Sealing
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ZZ |
2RS |
2RSL |
Low friction torque |
excellent A |
excellent A |
good B |
High speed |
excellent A |
excellent A |
good B |
Grease seal |
good B |
excellent A |
best excellent AA |
dustproof |
good B |
excellent A |
best excellent AA |
waterproof |
bad C |
good B |
excellent A |
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AA:utmost excellent
A:excellent
B:good
C:bad |
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