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GB/T 9074.1-2018

Chinese Standard: 'GB/T 9074.1-2018'
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BASIC DATA
Standard ID GB/T 9074.1-2018 (GB/T9074.1-2018)
Description (Translated English) Bolt or screw and washer assemblies with plain washers
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard J13
Classification of International Standard 21.060.10
Word Count Estimation 10,122
Date of Issue 2018-12-28
Date of Implementation 2019-07-01
Older Standard (superseded by this standard) GB/T 9074.1-2002
Drafting Organization China Machine Productivity Promotion Center
Administrative Organization National Fastener Standardization Technical Committee
Proposing organization China Machinery Industry Federation

GB/T 9074.1-2018
Bolt or screw and washer assemblies with plain washers
ICS 21.060.10
J13
National Standards of People's Republic of China
Replace GB/T 9074.1-2002
Bolt or screw and flat washer assembly
(ISO 10644.2009, Screwandwasherassembliesmadeofsteelwithplain
washers-Washerhardnessclasses200HVand300HV, MOD)
Published on.2018-12-28
2019-07-01 implementation
State market supervision and administration
China National Standardization Administration issued
Foreword
This part is one of the national standards for the “fastener assembly” series. The series includes.
---GB/T 9074.1 bolt or screw and flat washer assembly;
---GB/T 9074.2 cross recessed pan head screw and outer serrated lock washer assembly;
---GB/T 9074.3 cross recessed pan head screw and spring washer assembly;
---GB/T 9074.4 cross recessed pan head screw, spring washer and flat washer assembly;
---GB/T 9074.5 cross recessed small pan head screw and flat washer assembly;
---GB/T 9074.7 cross recessed small pan head screw and spring washer assembly;
---GB/T 9074.8 cross recessed small pan head screw, spring washer and flat washer assembly;
---GB/T 9074.9 cross recessed countersunk head screw and tapered lock washer assembly;
---GB/T 9074.10 cross recessed countersunk head screw and tapered lock washer assembly;
---GB/T 9074.11 Cross recessed hex head bolt and flat washer assembly;
---GB/T 9074.12 cross recessed hex head bolt and spring washer assembly;
---GB/T 9074.13 Cross recessed hex head bolts, spring washers and flat washer assemblies;
---GB/T 9074.15 Hex head bolt and spring washer assembly;
---GB/T 9074.16 Hex head bolt and outer serrated lock washer assembly;
---GB/T 9074.17 Hex head bolts, spring washers and flat washer assemblies;
---GB/T 9074.18 self-tapping screws and flat washer assemblies;
---GB/T 9074.20 cross recessed hex head self-tapping screws and flat washer assembly;
---GB/T 9074.26 assembly spring washer;
---GB/T 9074.27 External sawtooth lock washer for assembly;
---GB/T 9074.28 Conical locking washer for assembly;
---GB/T 9074.31 Conical elastic washers for assemblies;
---GB/T 9074.32 Bolt or screw and tapered elastic washer assembly.
This part is the first part of GB/T 9074.
This part is drafted in accordance with the rules given in GB/T 1.1-2009.
This part replaces GB/T 9074.1-2002 "Bolt or Screw and Flat Washer Assembly". This part is related to GB/T 9074.1-2002
The main technical changes are as follows.
--- When the bolt or screw is ≤ 8.8, the hardness level of the washer is changed to.200HV or 300HV (see Table 3, Chapter 4 of the.2002 edition);
--- Increase the technical requirements for non-electrolytic zinc sheet coating and phosphating (see Table 3);
--- Add "If other technical requirements or surface treatment are required, the supply and demand agreement should be provided" (see Table 3);
--- Increase the standardized combination of bolts or screws and washers (see Table 4);
--- Mark the content to increase the hardness level of the gasket (see Chapter 6);
--- Added informative Appendix A "Methods for producing bolts or screws and flat washer assemblies" (see Appendix A).
This section uses the redrafting method to modify the ISO 10644.2009 "screw and washer assembly washer hardness class.200HV
And 300HV.
The technical differences between this part and ISO 10644.2009 and their reasons are as follows.
--- In the normative reference documents, replace the international standards with Chinese standards (see Chapter 2), increase the reference to GB/T 90.1 (see Table 2),
GB/T 90.2 (see Table 2) and GB/T 1237 (see 5.1) to comply with China's fastener basic standards;
--- Increase packaging technical requirements (Table 2) to meet the basic standards of fasteners in China.
This section also made the following editorial changes.
--- Modified the standard name.
This part was proposed by the China Machinery Industry Federation.
This part is under the jurisdiction of the National Fastener Standardization Technical Committee (SAC/TC85).
This section is responsible for drafting the unit. China Machine Productivity Promotion Center.
Participated in the drafting of this section. 7412 Factory in Zhoushan City, Zhejiang Haili Co., Ltd., Shanghai Shenguang High Strength Bolt Co., Ltd.
Jinyi Industrial Co., Ltd., Qifeng Precision Technology Co., Ltd., Hunan Feiwo New Energy Technology Co., Ltd., Zhejiang Jingyi Standard
Zhunquan Co., Ltd., Yuhuan Wanquan Machinery Manufacturing Co., Ltd., Zhejiang Gree Machinery Co., Ltd.
Product Quality Supervision and Inspection Center.
This part is explained by the National Fastener Standardization Technical Committee.
The previous versions of the standards replaced by this section are.
---GB/T 9074.1-1988, GB/T 9074.1-2002;
---GB/T 9074.14-1988.
Bolt or screw and flat washer assembly
1 Scope
This part of GB/T 9074 specifies the type dimensions, technical conditions and markings for bolts or screws and flat washer assemblies.
This section applies to thread sizes M2~M12, flat bearing surfaces, bolts or screws with performance grades of 8.8, 9.8 and 10.9, flat washers
Bolts or screws and flat washer assemblies with a ring hardness rating of.200 HV or 300 HV.
2 Normative references
The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article.
Pieces. For undated references, the latest edition (including all amendments) applies to this document.
GB/T 65 slotted cylindrical head screw (GB/T 65-2016, ISO 1207.2011, MOD)
GB/T 67 slotted pan head screw (GB/T 67-2016, ISO 1580.2011, MOD)
GB/T 70.1 hexagon socket head cap screws (GB/T 70.1-2008, ISO 4762.2004, MOD)
GB/T 90.1 fastener acceptance inspection (GB/T 90.1-2002, idtISO 3269.2000)
GB/T 90.2 Fastener Marking and Packaging
GB/T 97.4 flat washers for screw and washer assemblies (GB/T 97.4-2002, eqvISO 10673.1998)
GB/T 818 cross recessed pan head screw (GB/T 818-2016, ISO 7045.2011, MOD)
GB/T 1237 fastener marking method
GB/T 2671.2 hexagonal flower-shaped cylinder head screw (GB/T 2671.2-2017, ISO 14579.2011, MOD)
GB/T 2672 hexagonal flower-shaped pan head screw (GB/T 2672-2017, ISO 14583.2011, MOD)
GB/T 3098.1 Mechanical properties of fasteners, bolts, screws and studs (GB/T 3098.1-2010, ISO 898-1.2009,
MOD)
GB/T 5267.1 Fastener Plating (GB/T 5267.1-2002, ISO 4042.1999, IDT)
GB/T 5267.2 fastener non-electrolytic zinc sheet coating (GB/T 5267.2-2017, ISO 10683.2014, MOD)
GB/T 5782 Hex Head Bolts (GB/T 5782-2016, ISO 4014.2011, MOD)
GB/T 5783 hex head bolt full thread (GB/T 5783-2016, ISO 4017.2014, MOD)
GB/T 5784 Hexagon Head Bolts, Grade B (GB/T 5784-1986, eqvISO 4015.1979)
GB/T 11376 metal phosphate conversion film (GB/T 11376-1997, eqvISO 9717.1990)
GB/T 16674.1 Hexagon head flange bolt series (GB/T 16674.1-2016, ISO 15071.2011, MOD)
GB/T 16674.2 Hexagon head flange bolt small series of fine teeth (GB/T 16674.2-2016, ISO 15072.2012,
MOD)
3 type size
3.1 Flat washer type size should meet the requirements of GB/T 97.4.
3.2 The size of the bolts and screws for the assembly shall be in accordance with the following requirements except for the assembly of the gasket, and the rest shall comply with the corresponding country.
Standard regulations, such as GB/T 65, GB/T 67, GB/T 70.1, GB/T 818, GB/T 5782, GB/T 5783, GB/T 5784, etc..
---Bolts and screws should have a thin rod of diameter ds, the diameter of the washer should be in accordance with GB/T 97.4, so that it can rotate freely.
Note. ds≈ medium diameter.
--- The distance from the bearing surface to the beginning of the complete thread of the first buckle should be increased to the maximum thickness that can accommodate the gasket. For this type of product, it will be
Thread the thread to a position close to the washer.
--- Transition circle diameter da1 (see Figure 1 and Table 1), should be less than the transition circle diameter da specified in the product standard (see Table 4), the reduction is
The difference between the nominal diameter and the diameter of the rolled thread blank. The curvature specified for the fillet in the corresponding national standard, in the assembly
It should not change.
Figure 1 Transition circle diameter da1 and polished rod diameter ds
3.3 Examples of bolts or screws and flat washer assemblies, see Figures 2 and 3.
Figure 2 Bolts threaded to the washer
Figure 3 Screw with thin rod
Table 1 Dimensions are in millimeters
Thread size
Ab
Max
Da1
Max
Flat washer size c
Small series
S type
Standard series
N type
Large series
L type
Nominal
D2
Max
Nominal
D2
Max
Nominal
D2
Max
M2
M2.5
M3
(M3.5)a
M4
M5
M6
M8
M10
M12
2Pd
2.4 0.6 4.5 0.6 5 0.6 6
2.8 0.6 5 0.6 6 0.6 8
3.3 0.6 6 0.6 7 0.8 9
3.7 0.8 7 0.8 8 0.8 11
4.3 0.8 8 0.8 9 1 12
5.2 1 9 1 10 1 15
6.2 1.6 11 1.6 12 1.6 18
8.4 1.6 15 1.6 16 2 24
10.2 2 18 2 20 2.5 30
12.6 2 20 2.5 24 3 37
a Try not to use the specifications in parentheses as much as possible.
b The maximum distance from the bearing surface of the washer to the beginning of the complete thread of the first buckle, when measured with a flat surface (ie with a ring gauge that is not chamfered), the washer should be supported with the screw
Face or head rounded corner contact, see Figure 2.
c Dimensions taken from GB/T 97.4 are for reference only.
dP---pitch.
3.4 According to the supply and demand agreement, a U-shaped undercut groove can be used under the hex head bolt head, see Figure 4 and Table 2.
a Smooth transition.
Figure 4 Alternative sub-U-shaped undercut
Table 2 U-shaped dimensions are in millimeters
Thread size d M3 M4 M5 M6 M8 M10 M12
Da2 max 3.6 4.7 5.7 6.8 9.2 11.2 13.7
r min 0.1 0.2 0.2 0.25 0.4 0.4 0.6
Max 0.20 0.25 0.25 0.30 0.40 0.40 0.50
Min 0.05 0.05 0.05 0.10 0.10 0.10
Note. The remaining dimensions are shown in Table 1.
4 Technical conditions and reference standards
The flat washer in the assembly should be free to rotate without falling off.
Note. In order to meet the technical requirements (see Appendix A), the manufacture of bolts or screws and washer assemblies requires consideration of materials, bolts or screw blanks and washers.
Assembly process of the device.
The technical conditions and reference standards are shown in Table 3.
Table 3 Technical conditions and reference standards
Item bolt or screw a flat washer
Mechanical behavior
grade
≤8.8.200HV or 300HV
9.8, 10.9 300HV
Standard GB/T 3098.1 GB/T 97.4
Surface treatment
Not treated;
Electroplating technology requirements are in accordance with GB/T 5267.1;
Non-electrolytic zinc sheet coating technology requirements according to GB/T 5267.2;
Phosphating technology requirements are in accordance with GB/T 11376;
For other technical requirements or surface treatment, the supply and demand agreement
Acceptance and packaging GB/T 90.1, GB/T 90.2
a Bolts or screws in the assembly shall comply with the material and performance levels of the finished product in accordance with the relevant product standards. When a dispute arises, the arbitration test should be removed.
After the gasket, press GB/T 3098.1.
Note. Surface treated gasket hardness grades are available from the production methods described in Appendix A.
5 bolt or combination of screw and washer
5.1 Bolt or combination of screws and washers are shown in Table 4.
5.2 When assembling, the minimum inner diameter d1 of the washer and the maximum transition circle diameter da1 of the bolt or screw may occur.
It is possible that there may be contact marks at the rounded corners of the head and the torque/clamping force may be affected.
To avoid interference and contact marks, it is recommended to use U-shaped undercut bolts and screws or chamfered washers.
Table 4 Combination code of bolt or screw and washer
Bolt or screw
Washer a
S type N type L type
Standard number code name S code N code L
GB/T 5783 S1 - × ×
GB/T 5782b S2 - × ×
GB/T 818 S3 - × ×
GB/T 70.1 S4 × × ×
GB/T 67 S5 - × ×
Table 4 (continued)
Bolt or screw
Washer a
S type N type L type
Standard number code name S code N code L
GB/T 65 S6 × × ×
GB/T 2671.2 S10 × × ×
GB/T 2672 S11 - × ×
GB/T 16674.1 S12 - × ×
GB/T 16674.2 S13 - × ×
a According to GB/T 97.4. "-" means no such form; "x" means an optional combination.
b The bolts of GB/T 5782 are similar to the bolts of GB/T 5784 after reducing the rod diameter according to Chapter 3.
6 mark
6.1 Marking content
The marking of the assembly should include the following.
--- Description of the component;
---This standard number;
---The characteristics of bolts or screws;
......
Related standard:   GB/T 9074.18-2017  GB/T 9074.31-2017
Related PDF sample:   GB/T 9074.8-1988
   
 
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