JB/T 5389.1-1995 Rolling bearings Four-row cylindrical roller bearings for rolling mills JB/T5389.1-1995 Standard download and decompression password: www.bzxz.net

JB/T5389.1---1995
Foreword
This standard is formed by merging the two standards JB4039--85 "Outline Dimensions of Four-row Cylindrical Roller Bearings for Rolling Mills" and JB/T5389-91 "Technical Conditions of Four-row Cylindrical Roller Bearings for Rolling Mills". The main revisions are:
a) Improve the code method of four-row cylindrical roller bearings; b) Add some bearing models:
c) Remove the words "Inner diameter is a non-preferred size"; Radial clearance", inner diameter size 500mm or more, the clearance value is the same as that of foreign advanced bearings d) The clearance value is the same as GB4604-93 "Product Sample of Rolling Bearing Company";
e) The technical requirements for the inner ring of commercial bearings are moved to the appendix; f) The tapered hole clearance value in the original standard appendix is ??cancelled. Appendix A of this standard is the standard appendix.
Appendix B of this standard is the prompt appendix.
This standard is proposed by the National Technical Committee for Standardization of Rolling Bearings. This standard is under the jurisdiction of the Luoyang Bearing Research Institute of the Ministry of Machinery Industry. The drafting units of this standard are: Wafangdian Bearing Factory and Beijing Bearing Research Institute. The main drafters of this standard are: Zou Renkai and Li Lianyuan. 195
1 Scope
Standards of the Machinery Industry of the People's Republic of China
Rolling Bearings
Four-row Cylindrical Roller Bearings for Rolling Mills
JB/T5389.1:1995
This standard specifies the structure, code, size and technical conditions of four-row cylindrical roller bearings for rolling mills (hereinafter referred to as bearings). This standard applies to the manufacture, inspection, design selection and acceptance of bearings. 2 Referenced Standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards are subject to revision, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T272--93 Rolling bearing code method
GB307.284 Rolling bearing tolerance measurement method GB307.3--84 Rolling bearing
GB 3203--82
G13 7811 ---87
JB 1255..91
--General technical requirements
Technical conditions for carburizing bearing steel
Rolling bearing parameter symbols
Technical conditions for heat treatment of high carbon chromium bearing steel rolling bearing parts J3/T 2974 ---93
JB/T 3016.-.91
JB/T 3017-
[B/ 3034
-91
93
JB/T 3573---93
JB/T 3574--92
ZBJ11020
·89
Z13 J36 001 --86
ZB J36 002—86
3 Symbols and abbreviations
Rolling bearings
Rolling bearings
Rolling bearings
Rolling bearings
Rolling bearings
Rolling bearings
Supplementary provisions for code methods
Technical conditions for packaging nailboard boxes
Technical conditions for packaging cartons
Oil seal anti-rust packaging
Measurement and evaluation methods of radial clearance
Product marking
Inspection rules for rolling bearings and their commercial parts Quality standard for carburizing heat treatment of rolling bearing parts Quality standard for deep carburizing heat treatment of rolling bearing parts Except for the following symbols, the symbols cited in this standard conform to the provisions of GB7811. Factory: Inner ring nominal chamfer
\: Outer ring nominal chamfer
mia: Inner ring minimum single chamfer size
ixain: Outer ring minimum one-way chamfer size
dimpnaxd2npmnin: Between the two inner rings of the bearing, the maximum average inner diameter and the minimum average inner diameter di: Inner ring raceway nominal diameter
: Inner ring raceway diameter deviation
Approved by the Ministry of Machinery Industry on 1995-06-16
496
Implemented on 1996-07-01
JB/T 5389.1
Single.-Radial plane. Inner ring raceway diameter variation E: Inner ring raceway nominal width
Li: Inner ring raceway straightness
diau—dimp: Difference between the average diameters at both ends of the inner ring raceway Sa: Variation of the inclination of the inner ring raceway element line to the base end face Fw: Inner diameter of roller group
4Structural type
FC type
FCD type-
Four-row cylindrical roller bearing (see Figure 1):
One pair of inner rings and four-row cylindrical roller bearings (see Figure 2): FCDP type
1995
Double inner ring four-row cylindrical roller bearing with flat retaining ring on the outer ring (see Figure 3). Figure 1 FC type
Figure FCIP type
Figure 2 FCD type
497
5 Code
5.1 Code composition
JB/T5389.1---1995
The bearing code consists of type code, scale code and post-code, and the arrangement order is as follows; post-code
Scale code
Type code
5.2 Type code
The type code consists of uppercase Latin letters, indicating the structural characteristics of the bearing, see Table 1. There is a half-character space between the type code and the size code (except for the code with \): Table]
Type code
FC
FCD
FCDP
Size code
5.3
Conclusion
Four-row cylindrical liquid bearing (one inner ring)Double inner ring four-row cylindrical roller bearing
Features
Double inner ring net-row cylindrical roller bearing with flat retaining ring on the outer ringFeatures
Size codes are composed of Arabic numerals, which represent the codes of nominal inner diameter N, nominal outer diameter D and the number of millimeters of nominal width 阝 from left to right. The representation method is shown in Table 2.
Table 2
Code Item
Table Method
5.4 Post-code
Nominal inner diameter code
Nominal inner diameter in millimeters/5
Nominal outer diameter D code
Nominal outer diameter in millimeters/5
Nominal width B code
Nominal width in millimeters
Post-code is a supplementary code for bearings when the internal structure changes and for indicating tolerance grade, clearance, heat treatment, etc. Post-codes are represented by uppercase Latin letters (or Arabic numerals). The rules for compiling post-codes shall comply with the provisions of GB/T272. The meaning and arrangement order are shown in Table 3. Table 3
Sequence number
3
5.5 Marking example
Rolling bearing
498
Item name
Internal structure
Cage and material
Tolerance grade
Travel Chen
Others
FCD100144530/P53
Contains
Changes in bearing internal structure
Meaning
Changes in bearing cage structure and material
Tolerance grade specified in the standard
Clearance group specified in the standard
Heat treatment, lubrication, etc.
JB/T 5389. ---1995
Hip code
A, B or C
According to JB/T2974
According to GB/T272
According to GB/T272
According to JB/T2974
FCD
100
144
530/F53
B/T5389.1--1995
Tolerance Grade 5. Radial runner 3 Correction 1
Nominal width is 530mm
- Nominal outer diameter is 720mm
- Nominal inner diameter is 500mm
"Double inner four-row round rolling bearing
5.6 For bearings whose dimensions are not specified in this standard, the type code and size code in the code are separated by "/\". Example: FC/4258192 bearing has an outer diameter of 290mm and a width of 192mm, which is not specified in this standard. FC/82120440 bearing has an inner diameter of 410mm, which is not specified in this standard. 6 Dimensions
6.1 FC type bearing dimensions shall be in accordance with the provisions of Table 4. Table 4
Bearing code
FC:182870
FC2028104
FC202970
FC2030106
FC2234120
FC2436105
FC2640125
FC 2842125
FC2842155
FC2942155
FC2945156
FC3045120
FC3046156
FC3248168
FC3248124
FC:3450170
FC3452120
FC 3652168
FC3656180
FC3852168
FC3854200
FC:3856200
FC4056200
FC4058192
FC4064216
FC1260210
d
90
100
100
100
110
120| |tt||130
140
140
145
145
150
150
160||tt ||160
170
170
180
180
190
190
190
200
200
200
210
D
140
140
145
150| |tt||170
180
200
210
210
210
225
225||tt ||230
240
240
250
260
260
280
260
270
280
280
290
320
300
B
70
104| |tt||70
106
120
105
125
125
155
155||tt ||156
120
156
168
124
170
120
168
180
168
200
200
200
192
216
210
Fu| |tt||105
111
113
113
127
135
14.9
158||tt ||158
166
169
168
174
183
183
192
195
202
207
212
212
214
222
226
233| |tt||231
r.
1.5
1. 5
1. 5
1.5
2
2
2
2
2
2
2| |tt||2.1
2.1
2.1
2.1
2.1
2.1
2.1
2. 1
2.1
2.1
2.1
2. 1||h||2.1||h||mm||hh||1. 1
1. 1
.
1.1
51
2
2.1
2.1
2.1
22, 1
.1
2.1
2、1
2.1
2.
2.1
2.|| tt||2.1
2.
ay
小明代号
FC4462192
FC:4464210
FC 4666206
FC:4668260
FC:4866220
FC 4872220
FC 5070220
FC 5274220
FC5276280
FC:5476230||tt| |FC:5678220
FC 5681280
FC 5882240
FC 5881300
FC 6084218
FC 6084240
FC6490240
FC:6196290
FC 6692340
FC: 6892260
FC:6896280
d
220
220
230
230
240
240
250
260
260
270
280|| tt||280
290
2903
300
300
320
320
330||tt| |340
340
JB/T 5389.1-—1995
裴4（完）
n
310
320|| tt||330
340
33)
360
350
370
380
380||tt ||390
420
410
420
120
420
150
480
460
460
480
B
192
210
206
260
220| |tt||220
220)
220
280
230
220
280
240|| tt||300
2.18
240
240
290
340
260
280||tt| |2FCI型、FCDP型图像发动发动在按表5的设计。6.2
表5
长谦
代号
FCD型
FCD 6084300
FCD6496350
FCD 6692340|| tt||FCID6896350
FCD 72102370
FCD 72104380
FCD74104380
FCD 76108400
FCD 80112410
FCD 84120440
FCD 88124450
FCD 92130-170
FCD 96136500
FC 96130450
500
FCDP型
FCDP 6084300
FCDP 6496350
FCDP 6692340
FCDP 6896350
FCDP 72102370
FCDP 72104380
FCDP 74104380
FCDP 76108400
FCDP 80112410
FCDP 84120440
FCDP 88124450
FCDP 92130470
FCDF 96136500
FCDP 96130450
&
300|| tt||320
330
340
360
360
370
380
400||tt| |420
440
460
480
480
420
480
460
480
510
520
520
540
560
600
620
650|| tt||680
650
F
246
248
260
261
264||tt| |272
278
292
294
298
312
318
320
327
332
332
355
364
365
370
374
300|| tt||350
340
350
370
380
380
400
410||tt| |170
450
470
500
450
F
'min
2.1
2.1
2.1
2.1
2.1
2.1
3
3
3
3| |tt||3
4
4
4
4
-1
4
4|| tt||4
332
364
365
378
392
405
409||tt| |422
445
170
487
509
532
525
raai
3
4
1
4
1
4
5
5
5|| hh||行||hh||mm||hh||2. 1
2.1
2.1
2.1
2.1
2.1
3
3
3| |hh||3||hh||3||hh||4||hh||4||hh||4||hh||4||hh||4||hh||mm||hh ||3
4
4
4
5
5
5
5
6
FCI型
承
代号
长
FCDP型
FCD 100144530
FCD) 106156570|| tt||FCD 110148510
FCD 112164630
FCD 114163594
FCD 120164575
FCD 120174640
FCD 126180670
FCD 130184670||tt ||FCD 134190700
FCD 138196715
FCD 140186620
FCD 142200715
FCD 146192620
FCD 150200670
FCD 160216700||tt ||FCD 160230850
FCD170230840
FCD180244840
FCD 1902721000
FCD 200272800
FCD 2123001120
FCD 222296980
FCD 2243161150. |tt||FCIDP 114163594
FCDP 120164575
JB/T5389.1---1995
表5（完）
500
530
550
560
570
600.
FCDP146192620
FCDP 150200670
FCDP 160216700
FCDP 160230850
FCDP170230840
FCDP 180214840www.bzxz.net
FCDP 1902721000||tt ||FCDP 200272800
FCDP 2123001120
FCDP 222296980
FCDP 2243161150
600
630
650
670| |tt||690
700
710
730
750
800
800
850||tt 1110 6和5级安全公差应果公公差电影视频表6、表7的设计720
780
740
820
815
820| |tt||870
900
920
950
980
930
1000
960||tt ||1000
1080
1150
1150
1220
1360
1360
1500
1480. |80
120
180
到
主内场
120
180
250
250315.
-18
30
22
Va,
6
5
Vamy
公
6
915
15
1325
18
1530
23
3525|| tt||18 35125
12
14
19
23
26
11
14||tt ||17
19
差
5
max
25
5
7
8
Kia
等
13
30
18
4020
50
25| |tt||R
530
570
510
630
59.1
575
640||tt ||670
670
700
715
620
715
620
670
700
850
840
840
1000
800
1120
980
1150| |tt||d iunpmnx
F
568
601
600
625
628
660|| tt||682
698
723
756
767.5
763
787.5
790||tt| |813
878
905
928
989
1058
1084
1165
1210
1240
el anigmin
级
5
8
10！
8
18
E
Trmua
6
6
6
6
6
6|| tt||6
7.5
7.5
7.5
7.5
7. 5
7.5
7.5
7.5
7.5
*7.5
7.5
7.5
7.5
9.5
9.5
9.5
A
0.6.5
可下于室
200||tt| |m
6
6
G
6
G
G
7.5
7.5
7.5
7.5
7.5
7.5
7. 5
7.3
7.5
7.5
7.5
7.5
7.5
9.5
9.5| |tt||9.5
five
max
25
25030
300
30
30||tt ||3501 35 :
:
19
501
/mm
??????
315
0.6.5
上自定
400
400500
630
500
630
1800
800| |tt||1000
1000125
D/mm
??????
80
120
150
180| |tt||250
315
400
500
630
到
120
150||tt ||门
门
下自电
40-30/--23/40
45
5040
75|| tt||—1004
125
lo.6.5
上内家
C
0
180
250
315
400
500
630
800
80011000
1000
1250|| tt||7.2
1250
1600
游隙
0
0
0
0
0
45
3050
75
100
125
61
下自定
15| |tt||18
25
30
25
40
-45
50
75|| tt||20
25
28
33
38
45--
31
35|| tt||40
JB/T5389.1--1995
表 G（完）
Vrip
公
差
max
3012312
34
27
Vnp
1015
19
1325
15| |tt||18
23
28
E
50
3575
-100 j—60
125
-160
15
18
20
5
2.8
34
38
1
40100
125
38
10
12
13
16|| tt||26114
30
Kia
等
级
5
30
115||tt| |60
65
1570
80
90
1100
表了
外圈||tt| |Vne
公
11
14
19
23
26
1830
20
34
38
h
60:3575
160]
图像达向游隙按表8的设计。| |tt||1
14
15
19
21
25
29
34||tt ||差
10
18
20
Dirarmax
Dzrapmir
等
ct npinax -||tt ||d ap
[20115[12
23
18
2520115
38
50
63| |tt||K.
级
0
6
５101
max
35
9|| tt||7
8
9
10
12
18
45
20||tt| |E13
15
9
1o
18
113
2014
2317
2519
8
9
10
12
14
40
45
18|| tt||20
23
5025
60
30
r
9.6.5
正偏卷下偏券
400
40
m
5
miax
15
450150
500160 tt||10
11
13
15
18
120
70
135||tt| |8040
100/50
23
25
3823
18
[12016030
50||tt ||30
63
80
20 140 75 1 30
160
190
表8四列圆柱死子开发很向游隙（圆柱孔）公称内称||hh||d/mm||hh||性事||hh||80||hh||100||hh||120||hh||502| |tt||到
100
120
140
2组
min
15
15|| tt||15
max
50
55
60
min
50
50||tt| |60
0
max
85
90
105
nin
75
3维
85
1oo
max
110
125
145
min
105| |tt||125
4组
净
门
心
0
miax
140|| tt||165
145
190
200
250
-250
17
45||tt ||50120
aim
0.65
max
8
同
axes
300
-350
8
8
10
内
11
13
400
的
150
500|| tt||750
et
15
相
18
同20
-1000
1250|| tt||-1600
5组
in
155
180
200
25
μm|| tt||max
19元
220
245
公称内称
d/mtm
性交
140
160
180
200
225
250
280
315
355| |tt||400
450
500
560
630
710
800
900||tt ||1000
1120
1250
160
180
200
225
250
281)
315
355
400
150
500
560
630
710
800
900
1000
1120
1250
1400
2组
min| |tt||20
25
35
4.5
45
55
55
65||tt ||100
110
110
120
140
145
150
180
200
220
230
270
max
70
75
90
105| |tt||110
125
130
145
190
210
220
240||tt ||260
285
310
350
390
430
470
530
JB/T 5389.1--1995
表8（完）
组
mit
70
75
90||tt ||105
110
125
130
145
190
210
220
240
260
285
310
350
390
430
170
530| |tt||max
120
125
145
165
175
195
205||tt ||225
280
310
330
360
380
425
470
520
580
640
710
790
min
115
3组
120
1:453
160
170
190
20
225
280
310
330
360
380
425
470
520
580
G40|| tt||710
790
mtx
165
170
195
220
235||tt| |260
275
305
370
410
.140
480
500
565
630
690
770
850
950
1050
min
165| |tt||170
4组
max
215
220
195
220
235|| tt||260
275
305
370
110
440
480
500||tt| |565
630
690
770
850
950
1050
250
280
300
330
350
385
460
510
550
600|| tt||620
705
790
860
960
1060
1190
1310||tt| |min
225
250
275
305
330
370
410
5
155
510
565
625
max
275
300
330)| |tt||365
393
440
435
535
600
665
735||tt ||7.3 Materials／热方法
7.3.1 高频黎黎黄钢钢面的黄院的黑色，应电汉下载手机电视，读选用ZGCr15.ZGCt15SiMn、vacuum脱气GCr15.GCr15SiMn及－-般GCr15、GCr15SiMn Bearing steel.7.3.2 Bearing parts made of high-carbon chrome bearing steel G20Cr2Ni4A and G20Cr2Ni4 etc., whose raw materials should meet the requirements of FB3203. 7.3.3 Bearing parts made of high-carbon chrome bearing steel, whose heat treatment quality should meet the requirements of JB1255. 7.3.4 Bearing parts made of carbon steel bearing, heat treatment quality according to the depth of carbon layer depth shall meet the requirements of 73J36001 or ZB「36002.
Manufactured bearing parts should be handled with high precision, their hardness should meet the requirements of JB1255.
7.4 Bearing parts must be handled with care. The surface doesn't have a texture. 12 regulations. 6
2 regulations. 6
1--1995
表8（完）
组
mit
70
75
90
105
110
125
130
145
190
210
220
240|| tt||260
285
310
350
390
430
170
530||tt| |max
120
125
145
165
175
195
205
225
280
310
330
360
380
425
470
520|| tt||580
640
710
790
min
115
3组
120||tt ||1:453
160
170
190
20
225
280
310||tt ||330
360
380
425
470
520
580
G40
710
790
mtx
165
170
195
220
235
260| |tt||275
305
370
410
.140
480
500
565|| tt||630
690
770
850
950
1050
min
165||tt| |170
4组
max
215
220
195
220
235
260
275
305
370
110
440
480
500
565| |tt||630
690
770
850
950
1050
250
280||tt ||300
330
350
385
460
510
550
600
620
705
790
860
960
1060
1190
1310
min| |tt||225
250
275
305
330
370
410
5||tt ||155
510
565
625
max
275
300
330)||tt| |365
393
440
435
535
600
665
735
7.3 Materials and heat treatment
7.3.1 High carbon chromium bearing steel manufactured bearing parts, according to different usage requirements, separately selected ZGCr15.ZGCt15SiMn、vacuum脱气GCr15.GCr15SiMn－--般GCr15、GCr15SiMn bearing steel。 7.3.2 Bearing parts made of high-carbon chrome bearing steel G20Cr2Ni4A and G20Cr2Ni4 etc., whose raw materials should meet the requirements of FB3203. Bearing parts made of carbon steel, whose heat treatment quality is based on the depth of the carbon layer should meet the requirements of 73J36001 or ZB「36002.
7.3.5 Bearings made of high-carbon chrome steel电影应可通高回火电影，其图度应可以下载JB1255的实施。
7.4 Bearings的滚子素线must have 呈得度或修形得度。 7.5 Bearings件不可有裂纹。 工作电视不成学烧生、自点和脱確。7.6本未未计算长国，应电影电影图样受机行电影。8 明是核性和脱行系统
8.1 公差的电影时间按GB307.2的设计。6
1--1995
表8（完）
组
mit
70
75
90
105
110
125
130
145
190
210
220
240|| tt||260
285
310
350
390
430
170
530||tt| |max
120
125
145
165
175
195
205
225
280
310
330
360
380
425
470
520|| tt||580
640
710
790
min
115
3组
120||tt ||1:453
160
170
190
20
225
280
310||tt ||330
360
380
425
470
520
580
G40
710
790
mtx
165
170
195
220
235
260| |tt||275
305
370
410
.140
480
500
565|| tt||630
690
770
850
950
1050
min
165||tt| |170
4组
max
215
220
195
220
235
260
275
305
370
110
440
480
500
565| |tt||630
690
770
850
950
1050
250
280||tt ||300
330
350
385
460
510
550
600
620
705
790
860
960
1060
1190
1310
min| |tt||225
250
275
305
330
370
410
5||tt ||155
510
565
625
max
275
300
330)||tt| |365
393
440
435
535
600
665
735
7.3 Materials and heat treatment
7.3.1 High carbon chromium bearing steel manufactured bearing parts, according to different usage requirements, separately selected ZGCr15.ZGCt15SiMn、vacuum脱气GCr15.GCr15SiMn－--般GCr15、GCr15SiMn bearing steel。 7.3.2 Bearing parts made of high-carbon chrome bearing steel G20Cr2Ni4A and G20Cr2Ni4 etc., whose raw materials should meet the requirements of FB3203. Bearing parts made of carbon steel, whose heat treatment quality is based on the depth of the carbon layer should meet the requirements of 73J36001 or ZB「36002.
7.3.5 Bearings made of high-carbon chrome steel电影应可通高回火红设度，其图像应可以下载JB1255的实施。
7.4 Bearings的滚子素线must have 呈得度或修形得度。 7.5 Bearings件不是有裂纹。 工作电视不成存烧生、自点和脱確。7.6本未未计算长国，应电影电影图样受机行电影。8 明是核性和脱行系统
8.1 公差的时间方法按GB307.2的设计。6
140
480
500
565
630
690
770
850
950| |tt||1050
min
165
170
4 groups
max
215
220|| tt||195
220
235
260
275
305
370
110||tt| |440
480
500
565
630
690
770
850
950
1050
250
280
300
330
350
385
460|| tt||510
550
600
620
705
790
860
960||tt| |1060
1190
1310
min
225
250
275
305
330
370
410
5
155
510
565
625
max|| tt||275
300
330)
365
393
440
435
535||tt ||600
665
735
7.3 Materials and heat treatment
7.3.1 Bearing parts made of high carbon chromium bearing steel should be treated separately according to different usage requirements. Choose ZGCr15.ZGCt15SiMn, vacuum degassed GCr15.GCr15SiMn and general GCr15, GCr15SiMn bearing steel. 7.3.2 The raw materials of bearing parts made of carburized bearing steel G20Cr2Ni4A and G20Cr2Ni4 should comply with the provisions of (FB3203). 7.3.3 The heat treatment quality of bearing parts made of high carbon chromium bearing steel should comply with the provisions of JB1255. 7.3.4 The heat treatment quality of bearing parts made of carburized bearing steel should comply with the requirements of 73J36001 or ZB "36002 according to the depth of the carburized layer.
7.3.5 When the bearing service temperature exceeds 120C, the bearings made of high carbon chromium bearing steel The parts should be highly tempered and their hardness should comply with the requirements of JB1255.
7.4 The roller line of the bearing must be convex or modified. 7.5 The working surface of the bearing is not allowed to have cracks. Burns, soft spots and decarburization. 7.6 Items not specified in this standard shall comply with product drawings and current standards. 8 Testing methods and inspection rules
8.1 Testing methods
8.1.1 Tolerances The measurement method is in accordance with GB307.2 6
140
480
500
565
630
690
770
850
950| |tt||1050
min
165
170
4 groups
max
215
220|| tt||195
220
235
260
275
305
370
110||tt| |440
480
500
565
630
690
770
850
950
1050
250
280
300
330
350
385
460|| tt||510
550
600
620
705
790
860
960||tt| |1060
1190
1310
min
225
250
275
305
330
370
410
5
155
510
565
625
max|| tt||275
300
330)
365
393
440
435
535||tt ||600
665
735
7.3 Materials and heat treatment
7.3.1 Bearing parts made of high carbon chromium bearing steel should be treated separately according to different usage requirements. Choose ZGCr15.ZGCt15SiMn, vacuum degassed GCr15.GCr15SiMn and general GCr15, GCr15SiMn bearing steel. 7.3.2 The raw materials of bearing parts made of carburized bearing steel G20Cr2Ni4A and G20Cr2Ni4 should comply with the provisions of (FB3203). 7.3.3 The heat treatment quality of bearing parts made of high carbon chromium bearing steel should comply with the provisions of JB1255. 7.3.4 The heat treatment quality of bearing parts made of carburized bearing steel should comply with the requirements of 73J36001 or ZB "36002 according to the depth of the carburized layer.
7.3.5 When the bearing service temperature exceeds 120C, the bearings made of high carbon chromium bearing steel The parts should be highly tempered and their hardness should comply with the requirements of JB1255.
7.4 The roller line of the bearing must be convex or modified. 7.5 The working surface of the bearing is not allowed to have cracks. Burns, soft spots and decarburization. 7.6 Items not specified in this standard shall comply with product drawings and current standards. 8 Testing methods and inspection rules
8.1 Testing methods
8.1.1 Tolerances The measurement method is in accordance with GB307.2 6
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