JB/T 58651.1-1999 General Principles for Fastener Product Quality Classification JB/T58651.1-1999 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JE/T 58651.1~58651.14-1999
JB/T58652-1999
Fastener Product Quality Grading
(Internal Use)
Published on 1999-12-30
National Bureau of Machinery Industry
Implementation on 2000-06-01
JB.T58651.1-58651.14-1999
This series of standards is a reminder of the quality classification of fastener products/8691.1-58651.14-93 fastener products. During the revision, the original standard was revised, and its main technical content has changed greatly. From the implementation date, this series of standards will replace the Appendix A of JB/56651.1-58651.14-93, Appendix A of [B.T58651.1, Appendix D and Appendix D are informative appendices. This series of standards will be proposed and submitted by the Technical Committee for Standardization of Hardware! ：This series of engraving units: Shenyang Standard Parts Research Institute, Mechanical Science Research Institute of the Ministry of Machinery, Shanghai Hardware and Connectors Technology Research Center,
Machinery Industry Standard of the People's Republic of China
Fastener Product Quality Grading
(Internal Use)
JR/T58651.1-1999
Represents JB/[58651.1-93
This standard specifies the principles and methods for quality grading of various fastener products produced according to national standards and industry standards, and can also be used as a reference for quality grading of products produced according to other standards. This standard adopts one-level grading, namely superior products, first-class products, and qualified products. This standard applies to single specification products accepted by GB90. The following standards contain clauses, which are referenced in the standard by reference. When the standard is published, the references are for reference only. All standards will be revised. The parties using the standard should choose to use the following standard version. GB/T 90-1985 G8T 5779.1—1966 GR/T 5779.2—1986 GE/T5779.3-1966 JB.T 9ES1.1—199) JB/T9151.3—1999 JB/F 9151.4—1999 JB/F 9151.51999
J8/F 131.61999
JB/T 9151.71999
3 Terms, terms and codes
Fasteners acceptance inspection, marking and packaging
Fasteners surface defects Bolts, screws General requirements Surface defects of fasteners Requirements
Surface defects of fasteners Special requirements for bolts, screws and studs Fasteners testing methods, dimensions and geometrical accuracy Bolts, screws, nuts and nuts Testing methods for dimensions and geometrical accuracy Nail Fasteners testing force method Dimensions and geometrical accuracy Washer tightness test Force method Dimensions and geometrical accuracy Fasteners testing method Dimensions and geometrical accuracy Riveting test methods Dimensions and geometrical accuracy Figure 3.1 Defect level: The level of severity of the impact of defects on product quality. 2 The standard is divided into three levels: fatal defects (A), serious defects () and general defects []. 3.2 Defect weighting value: To describe the degree of influence of defects on product quality, the score given by converting quality into quantity. 4 The standard adopts A level = 100 points, B level = 50 points, C level = 10 points. 3.3 Unit defect score (F): The average defect score for each inspection item in a sample. 3.4 Unit defect score: The unit defect score interval specified according to the different levels of product quality. 3. Standard unit defect score: The minimum limit value of the unit defect score standard for each frequency trap level is represented by "F"\F". 3. The size code of the customer inspection item should be consistent with the current tightness standard. Approved by the National Machinery Industry Bureau on December 30, 1999
Implementation on June 1, 2000
4 Inspection items and sampling methods
4.1 Inspection item A
JB.T58651.1-19 www.bzxz.net
4.1,1H State external standard case product current scheduled inspection items are different, in the product blood classification standard into three items only the annual output of the Lan Lan inspection, not all products need to be inspected, H billion inspection will be limited to three cabinet 5 in the standard of the following characteristic index items,
4.1.3 Installation quality classification inspection, the product classification standard out of the gold items: monthly inspection, in the product total according to the specified situation 4.2 Oil sample small case
standard stipulates that the product size, surface defects and mixed products shall be inspected by the manufacturer; the joint venture can be tested by the manufacturer: 1=20: 4.4 GB/T90 standard qualified quality level (AQL) is respectively assigned. Test method
5.1 Inch and time accuracy performance method: Product quality classification standard B25:1, 9151.3-15? The starting point: Batch test method The industry stipulates more than two test methods and inspections for certain test items, but does not specify the following: 5.2 Test of mechanical performance and working performance (test 1 piece method: In the product quality classification standard, the standard should be replaced by standard elements: 6 Defect level and defect weighting division | |tt||The defect level is reduced, and the corresponding relationship between the defect value and the inspection items shall be as specified in Table 1. Table!
7 Single defect score calculation formula
Fatal defect
Strict defect
·Acid war Hong
European defect plus plate
The unit defect score F is calculated as follows:
F=Zeda+ZadeZedl
ny+n+me
Inspection word
Pull seat
Ten-inch collar, warm miscellaneous products
Secondary size small piece, surface and teaching Yin
Wu Zhong.Z..Z.Zc
—are the defect weighted values ​​of defect grades A, B, and C respectively; 2,-100, 2-50.2-10;da.tiy.de-
are the sum of the number of defects of all items in the department level: minutes are the defect grades The actual number of inspection items for grades A, D and C; YF-80.
8 Evaluation of product batch quality grade
For the product batch to be accepted, the quality grade shall be evaluated based on the unit score of the sample. JE/T58651.L—1999
8.1 The unit score standards for each grade shall be as specified in Table 2. Table 2
Quality assurance and maintenance
Quality grade of products||t t||…etc.
8.2 The standard unit defect points of various products shall be as follows: according to Table 3, the standard unit defect points of various products shall be as follows: Internal sugar breakage
Lifting nut
Screw (core)
Machine screw lamp
Set screw
Self-made
Single defect reduction point standard tape
Unit defect points>F
Unit defect points
Year position defect pointsF
JB/T 58651.1—1999
Thanks to A
Appendix)
Ordinary screw limit size
A! The limit sizes of spider grain required are shown in Tables AI to A6. The limit sizes of coarse tooth internal grain in Table A1H are
Taiwan Changmao
11. For small or medium-sized steels of MI 4, the tolerance band is 5t. 11.063
52 763
56 783
61 476
6i1 43
15 744
24 252
32 270
37 799
40 799
50 796
54 796
5A His
62 J05
54 (46
Thread condition
JH58651.1-1999
The limit size of the external thread of the table A2
35 949
47 929
55 92#
1) When 10 hours or MF4 wants to end, H public welfare book is h6
63 320
25 x31
13 342
54 (:4
42 014
16 :64 | | tt | | 30 462 | 1.5
MiS×15
M20×15
M22wis
M24×2
M27 ×2
M33×2
M39 × 3
M42 ×3
M45 4
M&4 ×4
Screw length
JB/T58651.1-195
Limit size of fine thread internal thread in Table A36H
36 000
17 216
19 216
43 3F6
57,717
11 188
31 70!
34 051
16 376
Thread specification
M10×1.25
M12 ×1.25
M12 ×1.5
M14 × [1.5
M20×2
M24×2
M27×2
M30×2
M,11 × 2
M36×3
M39×3
M42×3
M45×3
M52 × 3
M56×4
Mea x 4
M64 ×4
Length of thread
JE/T58651.1—1999
Limit size of fine pitch external thread in Table A46
China Light Industry
34:003
53 342
The smallest crown
return half the light
spin the skin
JB/T58651.1-999
57H's tooth internal frequency ripple suction limit size
11 113
12 966
14 966
52 878
12 701
1G:511
13 854
17 634
15 854
24 382
24 521
32 429
55 129
4C 979
.43 487
47 487
129211
40 129
42 587
46 sx7
5G 04G
Good grain war pattern
Xu Hechang
[8/T5651.1-1999
Limit size of coarse pitch external thread of A6Bg
11:54t
13 512
15 512
54 625
62 970
HO G23
2nl nn9
24 68R
30 339
54 573
63 573
.0 688
JB/T58651,L-[999
(Appendix of Prompt)
National Taper Pin Dimension Deviation Table
Table B Width Deviation Table
34.6. ..1
32.7 35.6
37 11. 3h.0
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