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Manufacturing process


Bearing Material
  Rings(cups & cones) & Rolling elements
XTSKY bearing rings(cups & cones), balls & rollers are made of GCr15 high carbon chromium bearing steel
This steel No. is equal to the AISI 52100(U.S.A.), DIN 100Cr6(Germany), JIS SUJ2(Japan) etc.

Chemical composition of GCr15 steel:
Steel No.
Chemical composition %
GCr 15
C
Si
Mn
P
S
Cr
Mo
Cu
Ni
0.95-1.05
0.15-0.35
0.25-0.45
0.027
0.02
1.40-1.65
-
0.25
0.30

Contrast of steel no. in different countries
Country
China
ISO
U.S.A.
Japan
Germany
France
Sweden
Standard
GB
AISI
JIS
DIN
NF
Steel No.
GCr15
683/XVLL1
52100
SUJ2
100Cr6
100C6
SKF3

Hardness
Hardness of bearing rings(cups & cones) & rolling elements is HRC60HRC65.

Retainers
XTSKY standard bearing retainers are made from cold rolled carbon steel. However, in cases of heavy duty, corrosive environment,misalignment and high speed operation, brass, stainless steel, nylon or phenolic resins will be used upon request.

Seals & Shields
XTSKY shields also employ carbon steel as standard.
Buna Nitrile is the standard and mostly common used material for XTSKY seals. Also, in order to meet the requirements of high temperature operation and compatibility with grease, a variety of other sealing materials are also applied to the seals.

Lubrication
Standard grease and oil are applied to XTSKY bearing products
XTSKY can also use special pointed brand grease or oil upon request


Tolerance
  XTSKY bearing tolerance standard accords with Chinese national standard GB/T307(equal to ISO492)
The following are the contrast tables of Chinese national standard with the foreign standards.

Contrast of tolerance class for radial bearings in different countries(except tapered roller bearing)
Country
Standard
Tolerance class
China
GB/T307
0 (G)
6 (E)
5 (D)
4 (C)
2 (B)
ISO
ISO492
0
6
5
4
2
Sweden
SKF
0
P6
P5
P4
P2
Germany
DIN 620/2
P0
P6
P5
P4
P2
U.S.A.
ANSI B3.14
ABEC1
ABEC3
ABEC5
ABEC7 
ABEC9
Japan
JIS B1514
0
6
5
4
2

Contrast of tolerance class for tapered roller bearing(metric size) in different countries
Country
Standard
Tolerance class
China
GB/T307
0
P6x
P5
P4
ISO
ISO492
0
6x
5
4
Sweden
SKF
0
CLN
P5
U.S.A.
ANSI
K
N
C
B
A
Japan
JIS
0
6x
6
5
4

Contrast of tolerance class for tapered roller bearing(inch size) in different countries
Country
Standard
Tolerance class
China
XTSKY
4
3
ISO
ISO492
4
3
0
00
Sweden
SKF
0
CL3
CL0
U.S.A.
ANSI
4
2
3
0
00
The standard manufacturing tolerance of XTSKY bearing is Class 0. Other tolerance grade can be supplied upon request

Tolerance of Class 0 radial bearing

Inner ring
d
dmp
Vdp
Vdmp
Bs
B1s
VBs
Kia
over
incl.
high
low
Dimension series
max
high
low
high
low
max
max
mm
µm
8, 9
0, 1
2, 3, 4
µm
µm
µm
µm
µm
max (µm)
2.5
10
0
-8
10
8
6
6
0
-120
0
-250
15
10
10
18
0
-8
10
8
6
6
0
-120
0
-250
20
10
18
30
0
-10
13
10
8
8
0
-120
0
-250
20
13
30
50
0
-12
15
12
9
9
0
-120
0
-250
20
15
50
80
0
-15
19
19
11
11
0
-150
0
-380
25
20
80
120
0
-20
25
25
15
15
0
-200
0
-380
25
25
120
180
0
-25
31
31
19
19
0
-250
0
-500
30
30
180
250
0
-30
38
38
23
23
0
-300
0
-500
30
40
250
315
0
-35
44
44
26
26
0
-350
0
-500
35
50
315
400
0
-40
50
50
30
30
0
-400
0
-630
40
60
400
500
0
-45
56
56
34
34
0
-450
0
-630
50
65
500
630
0
-50
63
63
38
38
0
-500
0
-800
60
70
630
800
0
-75
 -
 -
 -
 -
0
-750
 -
 -
70
80
800
1000
0
-100
 -
 -
 -
 -
0
-1000
 -
 -
80
90
1000
1250
0
-125
 -
 -
 -
 -
0
-1250
 -
 -
100
100
1250
1600
0
-160
 -
 -
 -
 -
0
-1600
 -
 -
120
120
1600
2000
0
-200
 -
 -
 -
 -
0
-2000
 -
 -
140
140

Outer ring
D
Dmp
VDp
VDmp
Cs
C1s
VCs
Kea
over
incl.
high
low
Dimension series
With oil seals
max
high
low
high
low
max
max
mm
µm
8, 9
0, 1
2, 3, 4
or shields
µm
µm
µm
µm
µm
max (µm)
6
18
0
-8
10
8
6
10
6
same as inner ring Bs, B1s, VBs
15
18
30
0
-9
12
9
7
12
7
15
30
50
0
-11
14
11
8
16
8
20
50
80
0
-13
16
13
10
20
10
25
80
120
0
-15
19
19
11
26
11
35
120
150
0
-18
23
23
14
30
14
40
150
180
0
-25
31
31
19
38
19
45
180
250
0
-30
38
38
23
 -
23
50
250
315
0
-35
44
44
26
 -
26
60
315
400
0
-40
50
50
30
 -
30
70
400
500
0
-45
56
56
34
 -
34
80
500
630
0
-50
63
63
38
 -
38
100
630
800
0
-75
94
94
55
 -
55
120
800
1000
0
-100
125
125
75
 -
75
140
1000
1250
0
-125
 -
 -
 -
 -
 -
160
1250
1600
0
-160
 -
 -
 -
 -
 -
190
1600
2000
0
-200
 -
 -
 -
 -
 -
220
2000
2500
0
-250
 -
 -
 -
 -
 -
250

Tolerance of Class 0 tapered roller bearing (metric size)

Cone and width
d
dmp
Vdp
Vdmp
Bs
Kia
Ts
T1s
T2s
over
incl.
high
low
max
max
high
low
max
high
low
high
low
high
low
mm
µm
µm
µm
µm
µm
µm
µm
µm
10
18
0
-12
12
9
0
-120
15
+200
0
+100
0
+100
0
18
30
0
-12
12
9
0
-120
18
+200
0
+100
0
+100
0
30
50
0
-12
12
9
0
-120
20
+200
0
+100
0
+100
0
50
80
0
-15
15
11
0
-150
25
+200
0
+100
0
+100
0
80
120
0
-20
20
15
0
-200
30
+200
-200
+100
-100
+100
-100
120
180
0
-25
25
19
0
-250
35
+350
-250
+150
-150
+150
-150
180
250
0
-30
30
23
0
-300
50
+350
-250
+150
-150
+150
-150
250
315
0
-35
35
26
0
-350
60
+350
-250
+150
-150
+150
-150
315
400
0
-40
40
30
0
-400
70
+400
-400
+200
-200
+200
-200
400
500
0
-45
45
34
0
-450
70
+400
-400
500
630
0
-50
50
38
0
-500
85
+500
-500
630
800
0
-75
75
56
0
-750
100
+600
-600
800
1000
0
-100
100
75
0
-1000
120
+750
-750
1000
1250
0
-125
0
-1250
120
+1000
-1000
1250
1600
0
-160
0
-1600
120
+1500
-1500
1600
2000
0
-200
0
-2000
120
+1500
-1500

Cup
D
Dmp
VDp
VDmp
Cs
Kea
over
incl.
high
low
max
max
high
low
max
mm
µm
µm
µm
µm
µm
18
30
0
-12
12
9
same as Bs
18
30
50
0
-14
14
11
20
50
80
0
-16
16
12
25
80
120
0
-18
18
14
35
120
150
0
-20
20
15
40
150
180
0
-25
25
19
45
180
250
0
-30
30
23
50
250
315
0
-35
35
26
60
315
400
0
-40
40
30
70
400
500
0
-45
45
34
80
500
630
0
-50
50
38
100
630
800
0
-75
75
55
120
800
1000
0
-100
100
75
120
1000
1250
0
-125
125
94
120
1250
1600
0
-160
160
120
120
1600
2000
0
-200
120
2000
2500
0
-250
120

Tolerance of Class 4 tapered roller bearing (inch size)

Cone
d
ds
over
incl.
high
low
mm
µm
 -
76.2
+13
0
76.2
101.6
+25
0
101.6
266.7
+25
0
266.7
304.8
+25
0
304.8
609.6
+51
0
609.6
914.4
+76
0
914.4
1219.2
+102
0
1219.2
 -
+127
0

Cup
D
Ds
Kia,Kea,Sia,Sea
over
incl
high
low
max
mm
µm
µm
 -
266.7
+25
0
51
266.7
304.8
+25
0
51
304.8
609.6
+51
0
51
609.6
914.4
+76
0
76
914.4
1219.2
+102
0
76
1219.2
 -
+127
0
76

Width
d
D
Ts
over
incl
over
incl
high
low
mm
µm
µm
 -
101.6
 -
 -
+203
0
101.6
266.7
 -
 -
+356
-254
266.7
304.8
 -
 -
+356
-254
304.8
609.6
 -
508
+381
-381
304.8
609.6
508
 -
+381
-381
609.6
 -
 -
 -
+381
-381

Tolerance of Class 0 tapered bore of radial bearing (tapered bore = 1:12)
d
dmp
Vdp
d1mp-dmp
over
incl
high
low
max
high
low
mm
µm
µm
µm
18
30
+21
0
13
+21
0
30
50
+25
0
15
+25
0
50
80
+30
0
19
+30
0
80
120
+35
0
25
+35
0
120
180
+40
0
31
+40
0
180
250
+46
0
38
+46
0
250
315
+52
0
44
+52
0
315
400
+57
0
50
+57
0
400
500
+63
0
56
+63
0
500
630
+70
0
 -
+70
0
630
800
+80
0
 -
+80
0
800
1000
+90
0
 -
+90
0
1000
1250
+105
0
 -
+105
0
1250
1600
+125
0
 -
+125
0
1600
2000
+150
0
 -
+150
0

Tolerance of Class 0 tapered bore of radial bearing (tapered bore = 1:30)

d
dmp
Vdp
d1mp-dmp
over
incl
high
low
max
high
low
mm
m
m
m
80
120
+20
0
25
+40
0
120
180
+25
0
31
+50
0
180
250
+30
0
38
+55
0
250
315
+35
0
44
+60
0
315
400
+40
0
50
+65
0
400
500
+45
0
56
+75
0
500
630
+50
0
63
+85
0
630
800
+75
0
+100
0
800
1000
+100
0
+100
0
1000
1250
+125
0
+115
0
1250
1600
+160
0
+125
0
1600
2000
+200
0
+150
0


Clearance
XTSKY bearing radial clearance accords with the Chinese national standard GB/T 4604,
which is equal to ISO 5753

The clearances is classified into 5 groups, C2, C0, C3, C4, C5 with different applications
depending on customer's request

Radial clearance of deep groove ball bearing
d
C2
C0
C3
C4
C5
over
incl.
min.
max
min.
max
min.
max
min.
max
min.
max
mm
m
2.5
6
1
8
5
15
10
20
15
25
21
33
6
10
2
9
6
17
12
25
19
33
27
42
10
14
2
10
6
19
13
26
21
35
30
48
14
18
3
12
8
21
15
28
23
37
32
50
18
24
4
14
10
23
17
30
25
39
34
52
24
30
5
16
11
24
19
35
29
46
40
58
30
40
6
18
13
29
23
40
34
53
46
66
40
50
6
19
14
31
25
44
37
57
50
71
50
65
7
21
16
36
30
50
45
69
62
88
65
80
8
24
18
40
35
60
54
83
76
108
80
100
9
27
22
48
42
70
64
96
89
124
100
120
10
31
25
56
50
83
75
114
105
145
120
140
10
38
30
68
60
100
90
135
125
175
140
160
15
44
35
80
70
120
110
161
150
210

Radial clearance of cylindrical bore self-aligning ball bearing
d
C2
C0
C3
C4
C5
over
incl
min
max
min
max
min
max
min
max
min
max
mm
m
18
24
7
17
13
26
20
33
28
42
37
55
24
30
9
20
15
28
23
39
33
50
44
62
30
40
12
24
19
35
29
46
40
59
52
72
40
50
14
27
22
39
33
52
45
65
58
79
50
65
18
32
27
47
41
61
56
80
73
99
65
80
23
39
35
57
50
75
69
98
91
123
80
100
29
47
42
68
62
90
84
116
109
144
100
120
35
56
50
81
75
108
100
139
130
170
120
140
40
68
60
98
90
130
120
165
155
205
140
160
45
74
65
110
100
150
140
191
180
240

Radial clearance of tapered bore self-aligning ball bearing
d
C2
C0
C3
C4
C5
over
incl
min
max
min
max
min
max
min
max
min
max
mm
m
 -
10
0
25
20
45
35
60
50
75
 -
 -
10
24
0
25
20
45
35
60
50
75
65
90
24
30
0
25
20
45
35
60
50
75
70
95
30
40
5
30
25
50
45
70
60
85
80
105
40
50
5
35
30
60
50
80
70
100
95
125
50
65
10
40
40
70
60
90
80
110
110
140
65
80
10
45
40
75
65
100
90
125
130
165
80
100
15
50
50
85
75
110
105
140
155
190
100
120
15
55
50
90
85
125
125
165
180
220
120
140
15
60
60
105
100
145
145
190
200
245
140
160
20
70
70
120
115
165
165
215
225
275
160
180
25
75
75
125
120
170
170
220
250
300
180
200
35
90
90
145
140
195
195
250
275
330
200
225
45
105
105
165
160
220
220
280
305
365
225
250
45
110
110
175
170
235
235
300
330
395
250
280
55
125
125
195
190
260
260
330
370
440
280
315
55
130
130
205
200
275
275
350
410
485
315
355
65
145
145
225
225
305
305
385
455
535
355
400
100
190
190
280
280
370
370
460
510
600
400
450
110
210
210
310
310
410
410
510
565
665
450
500
110
220
220
330
330
440
440
550
625
735

Radial clearance of tapered bore spherical roller bearing
d
C2
C0
C3
C4
C5
over
incl
min
max
min
max
min
max
min
max
min
max
mm
m
14
18
10
20
20
35
35
45
45
60
60
75
18
24
10
20
20
35
35
45
45
60
60
75
24
30
15
25
25
40
40
55
55
75
75
95
30
40
15
30
30
45
45
60
60
80
80
100
40
50
20
35
35
55
55
75
75
100
100
125
50
65
20
40
40
65
65
90
90
120
120
150
65
80
30
50
50
80
80
110
110
145
145
180
80
100
35
60
60
100
100
135
135
180
180
225
100
120
40
75
75
120
120
160
160
210
210
260
120
140
50
95
95
145
145
190
190
240
240
300
140
160
60
110
110
170
170
220
220
280
280
350
160
180
65
120
120
180
180
240
240
310
310
390
180
200
70
130
130
200
200
260
260
340
340
430
200
225
80
140
140
220
220
290
290
380
380
470
225
250
90
150
150
240
240
320
320
420
420
520
250
280
100
170
170
260
260
350
350
460
460
570
280
315
110
190
190
280
280
370
370
500
500
630
315
355
120
200
200
310
310
410
410
550
550
690
355
400
130
220
220
340
340
450
450
600
600
750
400
450
140
240
240
370
370
500
500
660
660
820
450
500
140
260
260
410
410
550
550
720
720
900
500
560
150
280
280
440
440
600
600
780
780
1000
560
630
170
310
310
480
480
650
650
850
850
1100
630
710
190
350
350
530
530
700
700
920
920
1190
710
800
210
390
390
580
580
770
770
1010
1010
1300
800
900
230
430
430
650
650
860
860
1120
1120
1440
900
1000
260
480
480
710
710
930
930
1220
1220
1570

Vibration & Noise
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 (um/s). 
Vibration acceleration is examined according to Z, Z1, Z2, Z3 values. Grade Z is fundamental.
Z1, Z2, Z3 successively indicate the vibration level ranging from low to high.  
Vibration velocity is examined as per V, V1, V2 and V3. Grade V is fundamental,
V1, V2, V3 successively indicate the vibration level ranging from low to high.

Vibration acceleration limits for single deep groove ball bearing
d
Diameter series (0)
Diameter series (2)
Diameter series (3)
mm
Z
Z1
Z2
Z3
Z
Z1
Z2
Z3
Z
Z1
Z2
Z3
3
35
34
32
28
36
35
32
30
37
36
33
31
4
35
34
32
28
36
35
32
30
37
36
33
31
5
37
36
34
30
38
37
34
32
39
37
35
33
6
37
36
34
30
38
37
34
32
39
37
35
33
7
39
38
35
31
40
38
36
34
 -
 -
 -
 -
8
39
38
35
31
40
38
36
34
 -
 -
 -
 -
9
41
40
36
32
42
40
37
35
 -
 -
 -
 -
10
43
42
38
33
44
42
39
35
46
44
40
37
12
44
43
39
34
45
43
39
35
47
45
40
37
15
45
44
40
35
46
44
41
36
48
46
42
38
17
46
44
40
35
47
45
41
36
49
47
42
38
20
47
45
41
36
48
46
42
38
50
48
43
39
22
47
45
41
36
48
46
42
38
50
48
43
39
25
48
46
42
38
49
47
43
40
51
49
44
41
28
49
47
43
39
50
48
44
41
52
50
45
42
30
49
47
43
39
50
48
44
41
52
50
45
42
32
50
48
44
40
51
49
45
42
53
51
46
43
35
51
49
45
41
52
50
46
43
54
52
47
44
40
53
51
46
42
54
52
47
44
56
54
49
45
45
55
53
48
45
56
54
49
46
58
56
51
47
50
57
54
50
47
58
55
51
48
60
57
53
49
55
59
56
52
49
60
57
53
50
62
59
54
51
60
61
58
54
51
62
59
54
51
64
61
56
53
65
49
48
46
 -
50
49
47
42
51
50
48
43
70
50
49
47
 -
51
50
48
43
52
51
49
44
75
51
50
48
 -
52
51
49
44
53
52
50
45
80
52
51
49
 -
53
52
50
45
54
53
51
46
85
53
52
50
 -
54
53
51
46
56
55
52
47
90
54
53
52
 -
56
55
53
48
58
57
54
49
95
56
55
54
 -
58
57
55
50
60
59
56
51
100
58
57
56
 -
60
59
57
52
62
61
58
53
105
60
59
58
 -
62
61
59
54
64
63
60
55
110
62
61
60
 -
64
63
61
56
66
65
62
57
120
64
63
62
 -
66
65
63
58
68
67
64
59

Vibration velocity limits for single deep groove ball bearing
d
V
V1
V2
V3
mm
low
medium
high
low
medium
high
low
medium
high
low
medium
high
band
band
band
band
band
band
band
band
band
band
band
band
3
80
44
44
60
35
32
48
26
22
31
16
15
4
80
44
44
60
35
32
48
26
22
31
16
15
5
110
72
60
74
48
40
58
36
30
35
21
18
6
110
72
60
74
48
40
58
36
30
35
21
18
7
130
96
80
92
66
54
72
48
40
44
28
24
8
130
96
80
92
66
54
72
48
40
44
28
24
9
130
96
80
92
66
54
72
48
40
44
28
24
10
160
120
100
120
80
70
90
60
50
55
35
30
12
160
120
100
120
80
70
90
60
50
55
35
30
15
210
150
120
150
100
85
110
78
60
65
46
35
17
210
150
120
150
100
85
110
78
60
65
46
35
20
260
190
150
180
125
100
130
100
75
80
60
45
22
260
190
150
180
125
100
130
100
75
80
60
45
25
260
190
150
180
125
100
130
100
75
80
60
45
28
260
190
150
180
125
100
130
100
75
80
60
45
30
300
240
190
200
150
130
150
120
100
90
75
60
32
300
240
190
200
150
130
150
120
100
90
75
60
35
300
240
190
200
150
130
150
120
100
90
75
60
40
360
300
260
240
180
160
180
150
130
110
90
80
45
360
300
260
240
180
160
180
150
130
110
90
80
50
420
320
320
280
200
200
210
160
160
125
100
100
55
420
360
360
280
220
200
210
180
180
125
110
110
60
480
360
440
320
220
240
240
180
200
145
110
130
65
300
260
420
180
160
240
130
100
150
105
80
105
70
360
310
460
200
180
280
150
120
200
110
90
135
75
360
310
460
200
180
280
150
120
200
110
90
135
80
420
360
540
240
210
320
180
120
240
130
110
160
85
420
360
540
240
210
320
180
150
240
130
110
160
90
480
420
600
290
250
370
210
180
270
145
125
180
95
480
420
600
290
250
370
210
180
270
145
125
180
100
560
490
670
340
300
420
250
215
310
170
145
200
105
560
490
670
340
300
420
250
215
310
170
145
200
110
640
570
750
400
350
480
290
260
350
190
175
225
120
640
570
750
400
350
480
290
260
350
190
175
225
   
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