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- RETAINERS-Our standard bearing retainers are made from quality cold rolled carbon steel. Nylon or brass are available upon request.
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- SEALS & SHIELDS-Our shields also employ quality carbon steel as standard. We uses a variety of high temperature operation and compatibility with grease. Buna-Nitrile is the standard material used.
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- LUBRICANTS-Our common greases used and their features shown in Table 2.
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Table 2 GREASE
MFGER |
BRAND |
THICKER |
BASE OIL |
DROPPING
POINT
|
|
TEMP. |
Our CODE |
ESSO
|
Beacom325
|
Lithium
|
Diester
|
193
|
290
|
|
L06
|
AC205
|
Natrium
|
Mineral
|
|
|
-60~+120
|
|
Andok B.
|
Natrium
|
Mineral
|
260
|
280
|
-25~+120
|
L01
|
Andok C
|
Natrium
|
Mineral
|
≥260
|
205
|
-40~+120
|
L02
|
Andok 260
|
Natrium
|
Mineral
|
200
|
250
|
-20~+150
|
L07
|
Kyodo Yushi
|
Multemp PS2
|
Lithium
|
Diester
|
189
|
280
|
-50~+110
|
L20
|
Multemp SRL
|
Lithium
|
Ester
|
191
|
245
|
-40~++150
|
L21
|
Multemp SC-A
|
Urea
|
|
260
|
280
|
0~+160
|
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Multemp ETISO
|
Urea
|
Mineral
|
260
|
280
|
-10~+160
|
|
KL über
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Staburags NBU12
|
Barium
|
Mineral
|
220
|
270
|
-35~+150
|
|
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Isoflex NBU15
|
Barium
|
Diester Mineral
|
220
|
280
|
-60~+130
|
|
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Asonic Gly32
|
Lithium
|
Sythetic
|
|
|
-50~+140
|
|
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Asonic GHY72
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Polyhamstoff
|
Ester
|
|
|
-40~+180
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|
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Unisilikon TK44N2
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Na-Komplex
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Silicone
|
|
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-60~+230
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Dow Corning
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Molykote 33M
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Lithium
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Silicone
|
210
|
260
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-70~+180
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Molykote 44M
|
Lithium
|
Silicone
|
204
|
260
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-40~+200
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Molykote 55M
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Lithium
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Silicone
|
|
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-55~+165
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Molykote FS3451
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Fluorotelomer
|
Phlorosilicone
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≥260
|
285
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-40~+230
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Shell
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Alvania No.2
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Lithium
|
Mineral
|
182
|
272
|
-25~+120
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L15
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Alvania No.3
|
Lithium
|
Mineral
|
183
|
233
|
-20~+135
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L16
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Alvania RS
|
Lithium
|
Mineral
|
183
|
252
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-25~++120
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Dolium R
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|
Mineral
|
238
|
281
|
-20~+140
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Aero shell No.5
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Microgel
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Mineral
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≥260
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282
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-10~+130
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L40
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Aero shell No.7
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Microgel
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Diester
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≥260
|
288
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-70~+150
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L42
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Aero shell No.15A
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Flaorotelomer
|
Silicone
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≥260
|
280
|
-70~+260
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Mobil Oil
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Mobilux 2
|
Lithium
|
Mineral
|
190
|
280
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-20~+130
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Mobilgrease 22
|
Lithium
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Diester Mineral
|
192
|
274
|
-50~+140
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L09
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Mobilgrease 28
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Bentonite
|
Sythetic hydrocarbon
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≥260
|
280
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-60~+180
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Mobilplex 47
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|
Mineral
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≥260
|
280
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-20~+120
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Du Pont
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Krytox 240AC
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Fluorotelomer
|
Fluorinated
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|
282
|
-35~+290
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Krytox 283AC
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Fluorotelomer
|
Fluorinated
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|
229
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-35~+290
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Krytox 143AC
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Fluorotelomer
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Fluorinated
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|
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-35~+290
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Caltex
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Chevron SRI-2
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Urea
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Mineral
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|
293
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-30~+175
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L19
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Anderol L-793A
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Lithium
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Diester
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|
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-60~+150
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II. TOLERANCE |
Bearing tolerance includes dimensional tolerance and revolving tolerance. Dimensional tolerance is a request when bearings are mounted on shafts or in housings. It includes bore/outerside diameter deviation from basic, inner ring/outer ring width deviation from basic and radius allowance . Geometric tolerance includes bore/outside diameter deviation in single plane, inner ring/outer ring width deviation in single radial plane. Revolving tolerance includes radial and axial runout of assembled bearing inner ring and outer ring, inner ring reference face runout with bore and outside cylindrical surface runout with outer ring reference face.
Tolerance class ranges from common class 0 to 6,5,4 and 2,from low to high. Table 3 below is the tolerance class stipulated in Chinese GB307 standard and its comparison with some other standards.
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Table 3 COMPARISON OF TOLERANCE CLASS
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Nationality |
Standard Number |
Preision grade |
Chinese |
GB307 |
0(G) |
6E |
5(D) |
4(C) |
2(B) |
ISO |
ISO492 |
0 |
6 |
5 |
4 |
2 |
Sweden |
Version 1985 |
0 |
P6 |
P5 |
P4 |
P2 |
West Germony |
DIN 620/2 |
Po |
P6 |
P5 |
P4 |
P2 |
U.S.A |
ANSI B3.14 |
ABEC1 |
ABEC3 |
ABEC5 |
ABEC7 |
ABEC9 |
Japan |
JIS B1514 |
0 |
6 |
5 |
4 |
2 |
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The standard manufacturing tolerance for our precision radial bearings is class 6, as shown in Table 4. |
Table 4 INNER RING
|
d
mm |
△ dmp |
V dp |
V dmp |
K ia |
△ B S |
V BS |
Diameter series |
all |
normal |
9 |
0.1 |
2.3.4 |
Over |
Incl. |
High |
Low |
Max |
Max |
Max |
High |
Low |
Max |
2.5 |
10 |
0 |
-7 |
9 |
7 |
5 |
5 |
6 |
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) |
30 |
50 |
0 |
-10 |
13 |
10 |
8 |
8 |
10 |
0 |
-120 |
20 |
50 |
80 |
0 |
-12 |
15 |
15 |
9 |
9 |
10 |
0 |
-150 |
25 |
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OUTER RING
|
D
mm |
△ Dmp |
V DP |
V Dmp |
Kea |
△ Cs |
Vcs |
open bearings |
capped |
Diameter series |
9 |
0.1 |
2.34 |
0.1.2.3.4 |
Over |
Incl. |
High |
Low |
Max |
Max |
Max |
High |
Low |
Max |
6 |
18 |
0 |
-7 |
9 |
7 |
5 |
9 |
5 |
8 |
Identical to △ Bs and VBs of onne ring of same bearing |
18 |
30 |
0 |
-8 |
10 |
8 |
6 |
10 |
6 |
9 |
30 |
50 |
0 |
-9 |
11 |
9 |
7 |
13 |
7 |
10 |
50 |
80 |
0 |
-11 |
14 |
11 |
8 |
16 |
8 |
13 |
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Where: |
d |
Basic bore diameter |
D |
Basic outside diameter |
△ dmp |
Single plane mean bore diameter deviation from basic |
△ Dmp |
Single plane mean outer diameter deviation from basic |
V dp |
Bore diameter variation in a single radial plane |
V Dp |
Outside diameter variation in a single radial plane |
V dmp |
Mean vore diameter variation |
V Dmp |
Mean outside diameter variation |
Kia |
Radial runout of assembled bearing inne ring |
Kea |
Radial runout of assembled bearing outer ring |
△ Bs |
Single inner ring width deviation from basic |
△ Cs |
Single outer ring width deviation from basic |
V Bs |
Inner ring width variation |
V Cs |
Outer ring width variation |
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III、CLEARANCE |
Bearing clearance means the value of displacement of the unfixed ring when it moves against the fixed ring in radial or axial direction before the bearing is mounted on a shaft or in a housing. According to the movement direction, it falls into radial clearance and axial clearance.
The standard clearance for our deep groove ball bearings are divided into four groups:C2, C0, C3&C4 as shown below in Table 5:
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Table 5 RADIAL CLEARANCE
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mm(d) |
C2 |
C0 |
C3 |
C4 |
over |
incl |
Min |
Max |
Min |
Max |
Min |
Max |
Min |
Max |
6 |
10 |
0 |
7 |
2 |
13 |
8 |
23 |
14 |
29 |
10 |
18 |
0 |
9 |
3 |
18 |
11 |
25 |
18 |
33 |
18 |
24 |
0 |
10 |
5 |
20 |
13 |
28 |
20 |
36 |
24 |
30 |
1 |
11 |
5 |
20 |
13 |
23 |
20 |
41 |
30 |
40 |
1 |
11 |
6 |
20 |
15 |
33 |
28 |
46 |
40 |
50 |
1 |
11 |
6 |
23 |
18 |
36 |
30 |
51 |
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I V 、 VIBRATION |
Bearing vibration means bearing components' elastic deformation that varies with time and all other movement that deviates from a theoretic position except that necessary to bearing functions. It has two modes-acceleration(dB) and velocity(μm/s) 、 Vibration acceleration is examined according to Z, Z1, Z2 and Z3 values. Grade Z is fundamental, Z1, Z2 &Z3 successively indicate the vibration level ranges from low to high. For detailed requirements, see Table6. Similary, vibration velocity is examined as per V, V1, V2 & V3. Grade V is fundamental, V1, V2 & V3 successively indicate the vibration level ranges from low to high. For details, see Table 7. Generally, velocity examination is better than acceleration examination in that it can more reflect bearings' manufacturing level and bearings/ inherent quality.
While our company keeps control of vibration velocity values, we also carry out vigorous control on abnormal noise from running bearings in test according to requirements of electric motor quality bearings.
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Table 6 VIBRTION (ACCELERATION)LIMITES FOR SINGLE BEARING dB
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mm(d) |
Diameter Series ( 1 ) |
Diameter Series ( 2 ) |
Diameter Series ( 3 ) |
Z |
Z 1 |
Z 2 |
Z 1 |
Z 2 |
Z 3 |
Z 1 |
Z 2 |
Z 3 |
5 |
37 |
36 |
34 |
37 |
34 |
32 |
37 |
35 |
33 |
6 |
37 |
36 |
34 |
37 |
34 |
32 |
37 |
35 |
33 |
7 |
39 |
38 |
35 |
38 |
36 |
34 |
--- |
--- |
--- |
8 |
39 |
38 |
35 |
38 |
36 |
34 |
--- |
--- |
--- |
9 |
41 |
40 |
36 |
40 |
37 |
35 |
--- |
--- |
--- |
10 |
43 |
42 |
38 |
42 |
39 |
35 |
44 |
40 |
37 |
12 |
44 |
43 |
39 |
43 |
39 |
35 |
45 |
40 |
37 |
15 |
45 |
44 |
40 |
44 |
41 |
36 |
46 |
42 |
38 |
17 |
46 |
44 |
40 |
45 |
41 |
36 |
47 |
42 |
38 |
20 |
47 |
45 |
41 |
46 |
42 |
38 |
48 |
43 |
39 |
25 |
48 |
46 |
42 |
47 |
43 |
40 |
49 |
44 |
41 |
30 |
49 |
47 |
43 |
48 |
44 |
41 |
50 |
45 |
42 |
35 |
51 |
49 |
45 |
50 |
46 |
43 |
52 |
47 |
44 |
40 |
53 |
51 |
46 |
52 |
47 |
44 |
54 |
49 |
45 |
45 |
55 |
53 |
48 |
54 |
49 |
46 |
56 |
51 |
47 |
50 |
57 |
54 |
50 |
55 |
51 |
48 |
57 |
53 |
49 |
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Table 7 VIBRATION (VELOCITY) LIMITES FOR SINGLE BEARIN u m/s |
mm(d) |
V |
V1 |
V2 |
V3 |
low band |
mid band |
high band |
low band |
mid band |
high band |
low band |
mid band |
high band |
low band |
mid band |
high band |
5 |
110 |
72 |
60 |
90 |
60 |
50 |
58 |
36 |
30 |
35 |
21 |
18 |
6 |
110 |
72 |
60 |
90 |
60 |
50 |
58 |
36 |
30 |
35 |
21 |
18 |
7 |
130 |
96 |
80 |
110 |
80 |
65 |
72 |
48 |
40 |
44 |
28 |
24 |
8 |
130 |
96 |
80 |
110 |
80 |
65 |
72 |
48 |
40 |
44 |
28 |
24 |
9 |
130 |
96 |
80 |
110 |
80 |
65 |
72 |
48 |
40 |
44 |
28 |
24 |
10 |
160 |
120 |
100 |
140 |
100 |
85 |
90 |
60 |
50 |
55 |
35 |
30 |
12 |
160 |
120 |
100 |
140 |
100 |
85 |
90 |
60 |
50 |
55 |
35 |
30 |
15 |
210 |
150 |
120 |
180 |
130 |
100 |
110 |
78 |
60 |
65 |
46 |
35 |
17 |
210 |
150 |
120 |
180 |
130 |
100 |
110 |
78 |
60 |
65 |
46 |
35 |
20 |
260 |
190 |
150 |
220 |
160 |
125 |
130 |
100 |
75 |
80 |
60 |
45 |
22 |
260 |
190 |
150 |
220 |
160 |
125 |
130 |
100 |
75 |
80 |
60 |
45 |
25 |
260 |
190 |
150 |
220 |
160 |
125 |
130 |
100 |
75 |
80 |
60 |
45 |
28 |
260 |
190 |
150 |
220 |
160 |
125 |
130 |
100 |
75 |
80 |
60 |
45 |
30 |
300 |
240 |
190 |
250 |
200 |
160 |
150 |
120 |
100 |
90 |
75 |
60 |
32 |
300 |
240 |
190 |
250 |
200 |
160 |
150 |
120 |
100 |
90 |
75 |
60 |
35 |
300 |
240 |
190 |
250 |
200 |
160 |
150 |
120 |
100 |
90 |
75 |
60 |
40 |
360 |
300 |
260 |
300 |
250 |
220 |
180 |
150 |
130 |
110 |
90 |
60 |
45 |
360 |
300 |
260 |
300 |
250 |
220 |
180 |
150 |
130 |
110 |
90 |
80 |
50 |
420 |
320 |
320 |
350 |
270 |
270 |
210 |
160 |
160 |
125 |
100 |
100 |
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Notes: |
1 、 Group V applies to manufacture's inspection on bearings; Group V1,V2&V3 apply to manufacture's and customer's inspection and acceptance on finished bearings that their vibration control demand is required by customers. |
2 、 The sinle bearing (any one from samples) is considered as unqualified product if its vibration velocity value on any band exceeds the value as stipulated in the table. |