GB/T 70.3-2023_English: PDF (GB/T70.3-2023)
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| Standard ID | GB/T 70.3-2023 (GB/T70.3-2023) | | Description (Translated English) | Hexagon socket countersunk head screws with reduced loadability | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | J13 | | Classification of International Standard | 21.060.10 | | Word Count Estimation | 16,125 | | Date of Issue | 2023-05-23 | | Date of Implementation | 2023-12-01 | | Older Standard (superseded by this standard) | GB/T 70.3-2008 | | Drafting Organization | China Machinery Productivity Promotion Center Co., Ltd., Shanghai Jiyoubiao Wu High Strength Fastener Co., Ltd., Hunan Shenyi Machinery Application Research Institute Co., Ltd., Quality Supervision and Testing Center for General Parts and Parts in Machinery Industry, Dafu Pump Industry Co., Ltd., Yuhuantian Ye Machinery Co., Ltd., Jiaxing Aozhan Industrial Co., Ltd. | | Administrative Organization | National Fastener Standardization Technical Committee (SAC/TC 85) | | Proposing organization | China Machinery Industry Federation | | Issuing agency(ies) | State Administration for Market Regulation, National Standardization Management Committee | | Standard ID | GB/T 70.3-2008 (GB/T70.3-2008) | | Description (Translated English) | Hexagon socket countersunk head screws | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | J13 | | Classification of International Standard | 21.060.10 | | Word Count Estimation | 10,136 | | Date of Issue | 2008-08-25 | | Date of Implementation | 2009-02-01 | | Older Standard (superseded by this standard) | GB/T 70.3-2000 | | Adopted Standard | ISO 10642-2004, MOD | | Drafting Organization | Productivity Promotion Center in the machine | | Administrative Organization | National Standardization Technical Committee fasteners | | Regulation (derived from) | National Standard Approval Announcement 2008 No.14 (Total No.127) | | Proposing organization | China Machinery Industry Federation | | Issuing agency(ies) | Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China; Standardization Administration of China | | Summary | This standard specifies the thread size of M3 ~ M20, performance rating of 8. 8, 10. 9 and 12. 9, product grade A grade hex head screws. Note: Special attention to Table 2 and Table 3 provisions on tensile loads. For additional technical requirements. Should current standards (such as GB/T 196, GB/T 3106, GB/T 3098. 1 and GB/T 3103. 1) in the selection. | | Standard ID | GB/T 70.3-2000 (GB/T70.3-2000) | | Description (Translated English) | Hexagon socket countersunk head screws | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | J13 | | Classification of International Standard | 21.060.10 | | Word Count Estimation | 11,142 | | Date of Issue | 2000/9/26 | | Date of Implementation | 2001/2/1 | | Adopted Standard | ISO 10642-1997, MOD | | Regulation (derived from) | Announcement of Newly Approved National Standards 2008 No. 14 (No. 127 overall) | | Proposing organization | National Machinery Industry Bureau | | Issuing agency(ies) | State Quality and Technical Supervision |
GB/T 70.3-2023
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 21.060.10
CCS J 13
Replacing GB/T 70.3-2008
Hexagon Socket Countersunk Head Screws with Reduced
Loadability
(ISO 10642:2019, Fasteners – Hexagon Socket
Countersunk Head Screws with Reduced Loadability, MOD)
降低承载能力内六角沉头螺钉
ISSUED ON: MAY 23, 2023
IMPLEMENTED ON: DECEMBER 1, 2023
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword ... 3
Introduction ... 6
1 Scope ... 7
2 Normative References ... 7
3 Terms and Definitions ... 8
4 Type, Dimension and Head Inspection ... 8
5 Technical Conditions ... 16
6 Marking and Labelling ... 17
7 Designation ... 18
Annex A (Informative) Minimum Ultimate Tensile Loads for Bolts and Screws with
Full Loadability, Coarse Pitch Threads M2 and M2.5 ... 19
Bibliography ... 20
Foreword
This Document was drafted as per the rules specified in GB/T 1.1-2020 Directives for
Standardization – Part 1: Rules for the Structure and Drafting of Standardizing Documents.
This Document is Part 3 of GB/T 70 Hexagon Socket Screws (containing measuring gauge).
GB/T 70 has published the following parts:
--- GB/T 70.1 Hexagon Socket head Cap Screws;
--- GB/T 70.2 Hexagon Socket Button Head Screws;
--- GB/T 70.3 Hexagon Socket Countersunk Head Screws with Reduced Loadability;
--- GB/T 70.4 Hexagon Socket Button Head Screws with Collar;
--- GB/T 70.5 Gauging of Hexagon Sockets;
--- GB/T 70.6 Hexagon Socket Head Cap Screws – Fine Pitch Thread.
This Document replaced GB/T 70.3-2008 Hexagon Socket Countersunk Head Screws.
Compared with GB/T 70.3-2008, this Document has the major technical changes as follows
besides the structural adjustments and editorial modifications:
a) It is clearly stated that hexagon socket countersunk head screws have reduced loadability
due to their head design (head size and hexagon socket penetration depth) (see Clause 1
of this Edition; Clause 1 of the 2008 Edition);
b) Add M2 and M2.5. Since their minimum tensile loads are not specified in GB/T 3098.1
and GB/T 3098.6, the corresponding formulas are used for calculation (see Clause 1,
Table 1, Annex A of this Edition);
c) Add material and technical requirements for stainless steel screws (see Clause 1, Table 4,
Table 5 of this Edition);
d) Add head type details (see Figure 4 of this Edition);
e) Delete the shorter lengths of M4~M20 (see Table 1 of the 2008 Edition);
f) Increase the actual maximum value of dk (see Table 1 and Table 2 of this Edition);
g) Add head height kmin as the reference size (see Table 1 and Table 2 of this Edition);
h) Use the inner wrenching depth tmax to replace the wall thickness wmin between the
wrenching position and the supporting surface, which is consistent with the dimensioning
method for hexalobular wrenching (see Table 1, Table 2 of this Edition; Table 1 of the
2008 Edition);
i) For some threaded screws from M14 to M20, the reference value of thread length b is
increased to 3d, so these screws can be subjected to tensile tests in accordance with GB/T
3098.6 (for screws with reduced loadability, b ≥ 3d is required) (see Table 2 of this
Edition; Table 1 of the 2008 Edition);
j) Add Da, Dk and F as gauge dimensions (see Figure 5, Table 3 of this Edition; Figure 2,
Table 1 of the 2008 Edition);
k) Add marking and labeling requirements (see Clause 6 of this Edition).
This Document modified and adopted ISO 10642:2019 Fasteners – Hexagon socket
countersunk head with reduced loadability.
The technical differences and causes between this Document and ISO 10642:2019 are as
follows:
--- Use the normatively quoted GB/T 2 to replace ISO 4753 to adapt to China’s technical
conditions (see Figure 1);
--- Use the normatively quoted GB/T 16938 to replace ISO 8992 to adapt to China’s
technical conditions (see Table 4);
--- Use the normatively quoted GB/T 197 to replace ISO 965-1 to adapt to China's technical
conditions (see Table 4);
--- Use the normatively quoted GB/T 3098.1 to replace ISO 898-1 to adapt to China's
technical conditions (see Table 4, Clause 6, Clause 7);
--- Use the normatively quoted GB/T 3098.6 to replace ISO 3506-1 to adapt to China's
technical conditions (see Table 4, Clause 6, Clause 7);
--- Use the normatively quoted GB/T 3103.1 to replace ISO 4759-1 to adapt to China's
technical conditions (see Table 4);
--- Use the normatively referenced GB/T 5267.1 to replace ISO 4042 to adapt to China’s
technical conditions (see Table 4);
--- Use the normatively quoted GB/T 5267.2 to replace ISO 10683 to adapt to China’s
technical conditions (see Table 4);
--- Use the normatively quoted GB/T 5779.1 to replace ISO 6157-1 to adapt to China's
technical conditions (see Table 4);
--- Use the normatively quoted GB/T 5779.3 to replace ISO 6157-3 to adapt to China's
technical conditions (see Table 4);
--- Use the normatively referenced GB/T 90.1 to replace ISO 3269 to adapt to China’s
Hexagon Socket Countersunk Head Screws with Reduced
Loadability
1 Scope
This Document specifies the type, dimensions, technical conditions, marking, labels and signs
of hexagon socket countersunk head screws with reduced loadability due to head design.
This Document is applicable to hexagon socket countersunk head screws with thread
specifications M2~M20; coarse threads; performance levels 8.8, 10.9 and 12.9; groups and
performance levels A2-50, A4-50, A2-70, A4-70, A2-80 and A4-80, and Level-A products.
NOTE 1: For other size options, see GB/T 2, GB/T 197 and GB/T 3106.
NOTE 2: Reduced loadability (related to the combination of countersunk head size and hexagonal
penetration depth specified in this Document) implies a limit to the minimum tensile load (see Table 5).
NOTE 3: Special attention needs to be paid to ensure that the countersunk head is aligned with the
countersunk hole support surface in the assembly.
2 Normative References
The provisions in following documents become the essential provisions of this Document
through reference in this Document. For the dated documents, only the versions with the dates
indicated are applicable to this Document; for the undated documents, only the latest version
(including all the amendments) is applicable to this Document.
GB/T 2 Fasteners – Ends of Parts with External Thread (GB/T 2-2016, ISO 4753:2011,
MOD)
GB/T 90.1 Fasteners – Acceptance Inspection (GB/T 90.1-2023, ISO 3269:2019, MOD)
GB/T 90.2 Fasteners – Marking and packaging
GB/T 197 General purpose metric screw threads – Tolerances (GB/T 197-2018, ISO 965-
1:2013, MOD)
GB/T 1237 Designation system for fasteners (GB/T 1237-2000, eqv ISO 8991:1986)
GB/T 3098.1 Mechanical properties of fasteners - Bolts, screws and studs (GB/T 3098.1-
2010, ISO 898-1:2009, MOD)
GB/T 3098.6 Mechanical properties of fasteners - Stainless steel bolts, screws and studs
(GB/T 3098.6-2023, ISO 3506-1:2020, MOD)
GB/T 3099.4 Terminology of fasteners - Control, inspection, delivery, acceptance and
quality (GB/T 3099.4-2021, ISO 1891-4:2018, MOD)
GB/T 3103.1 Essential oils and aromatic extracts - Determination of residual benzene
content (GB/T 3103.1-2002, idt ISO 4759-1:2000)
GB/T 5267.1 Fasteners - Electroplate coating (GB/T 5267.1-2023, ISO 4042:2022, MOD)
GB/T 5267.2 Fasteners - Non-electrolytically applied zinc flake coatings (GB/T 5267.2-
2021, ISO 10683:2018, MOD)
GB/T 5276 Fasteners - Bolts, screws, studs and nuts - Symbols and descriptions of
dimensions (GB/T 5276-2015, ISO 225:2010, MOD)
GB/T 5779.1 Fasteners-Surface discontinuities - Bolts, screws and studs for general
requirements (GB/T 5779.1-2000, idt ISO 6157-1:1988)
GB/T 5779.3 Fasteners - Surface discontinuities - Bolts, screws and studs for special
requirements (GB/T 5779.3-2000, idt ISO 6157-3:1988)
GB/T 16938 Fasteners - General requirements for bolts screws studs and nuts (GB/T
16938-2008, ISO 8992:2005, IDT)
3 Terms and Definitions
For the purposes of this Document, no terms and definitions apply.
4 Type, Dimension and Head Inspection
4.1 Type and dimension
The type of screw shall be as per the Figures 1~4; dimension of screw shall be as per Tables
1~2.
The dimension code and labelling shall be as stipulated in GB/T 5276.
......
GB/T 70.3-2008
ICS 21.060.10
J 13
GB
National Standard
of The People’s Republic of China
Replacing GB/T 70.3-2000
Hexagon socket countersunk head screws
内六角沉头螺钉
(ISO 10642. 2004, MOD)
ISSUE ON. AUGUST 25, 2012
IMPLEMENTED ON. FEBRUARY 1, 2009
Issued by. The General Administration of Quality Supervision, Inspection and
Quarantine of People's Republic of China; and China National
Standardization Management Committee
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative reference documents ... 5
3 Dimensions ... 6
4 Technical conditions and reference standards ... 11
5 Mark ... 12
Foreword
This Part is one of the product (including gauging) series standards of national standard
"Hexagon socket screws". The series include.
- GB/T 70.1-2008 Hexagon socket head cap screws
- GB/T 70.2-2008 Hexagon socket button head screws
- GB/T 70.3-2008 Hexagon socket countersunk head screws
- GB/T 70.4 Hexagon socket cap head screws – Fine thread stud
- GB/T 70.5-2008 Gauging of Hexagon Sockets
- GB/T 77-2007 Hexagon socket set screws with flat point
- GB/T 78-2007 Hexagon socket set screws with cone point
- GB/T 79-2007 Hexagon socket set screws with dog point
- GB/T 80-2007 Hexagon socket set screws with cup point
- GB/T 5281-1985 Hexagon socket head shoulder screws
This Part is part 3 of GB/T 70.
This Part modifies and adopts ISO 10642. 2004 "Hexagon socket countersunk head
screws" (English version), major changes are as follows.
- In reference documents, USE our national standards to replace international
standards (Chapter 2);
- ISO 10642 does not specify the packaging technical requirements, this Part
specified the packaging requirements (see Table 2);
- ISO 10642 does not specify simplified mark, this Part provides simplified mark (see
5.2) according to GB/T 1237.
This Part replaces GB/T 70.3-2000 "Hexagon socket countersunk head screws".
Compared with GB/T 70.3-2000, the major changes of this Part are as follows.
- ADD reference standard GB/T 5267.2 "Fasteners - Non-Electrolytically Applied
Zinc Flake Coatings" and GB/T 70.5 "Gauging of Hexagon Sockets" (Chapter 2);
- DELETE Appendix A.
This Part was proposed by the China Machinery Industry Federation.
This Part shall be administered by the National Fastener Standardization Technical
Committee (SAC/TC85).
Responsible drafting organization of this Part. The Machine Productivity Promotion
Center.
Participating drafting organizations of this Part. Shanghai Biaowu High-strength Fastener
Co., Beijing Standard Part Industry Corporation, Shenyang Standard Part Manufacturing
Plant, and Ningbo Zhongbin Fastener Manufacturing Co., Ltd.
This Part shall be responsibly interpreted by Secretariat of the National Fastener
Standardization Technical Committee.
The previous version of the standard replaced by this Part is.
- GB/T 70.3-2000.
Hexagon socket countersunk head screws
1 Scope
This Part specifies the hexagon socket countersunk head screws with. thread size is
M3~M20; performance grades are 8.8, 10.9, and 12.9; and product grade is A.
NOTE. Special attention shall be paid to the note in Table 2, and to the provisions in Table 3 relating to
tensile load.
If other technical requirements are required, it shall select from existing standards (such as
GB/T 196, GB/T 3106, GB/T 3098.1, and GB/T 3103.1).
2 Normative reference documents
The provisions in following documents become part of this Part, through reference in this
Part. For dated documents, subsequent amendments (excluding corrections) or revisions
shall not apply to this Part. However, all parties who enter into agreement according to this
Part are encouraged to study if the latest versions of these documents are applicable. For
undated documents, the latest version applies to this Part.
GB/T 2 Fasteners - Ends of Parts with External Thread GB/T 2-2001, IDT ISO 4753.
1999)
GB/T 70.5 Gauging of Hexagon Sockets (GB/T 70.5-2008, ISO 23429. 2004, IDT)
GB/T 90.1 Fasteners - Acceptance Inspection (GB/T 90.1-2002, IDT ISO 3269. 2000)
GB/T 90.2 Fasteners - Marking and Packaging
GB/T 196 General Purpose Metric Screw Threads - Basic Dimensions (GB/T
196-2003, ISO 724. 1993, ISO General Purpose Metric Screw Threads-Basic
Dimensions, MOD)
GB/T 197 General Purpose Metric Screw Threads - Tolerances (GB/T 197-2003, ISO
965-1. 1998, ISO General Purpose Metric Screw Threads - Tolerances-Part 1.
Principles and Basic Data, MOD)
GB/T 1237 Designation System for Fasteners (GB/T 1237-2000, eqv ISO 8991. 1986)
GB/T 3098.1 Mechanical Properties of Fasteners - Bolts, Screws and Studs (GB/T
3098.1-2000, IDT ISO 898-1. 1999)
GB/T 3103.1 Tolerances for Fasteners - Bolts, Screws, Studs and Nuts (GB/T
3103.1-2002, ISO 4759-1. 2000, IDT)
GB/T 3106 Bolts, Screws and Studs - Nominal Lengths and Thread Lengths for
General Purpose Bolts [GB/T 3106-1982 (affirmed in 1988), eqv ISO 888. 1976]
GB/T 5267.1 Fasteners - Electroplated Coatings (GB/T 5267.1-2002, ISO 4042. 1999,
IDT)
GB/T 5267.2 Fasteners - Non-Electrolytically Applied Zinc Flake Coatings (GB/T
5267.2-2002, ISO 10683. 2000, IDT)
GB/T 5276 Fasteners; Bolts, Screws, Studs and Nuts - Symbols and Designations of
Dimensions (GB/T 5276-1985, eqv ISO 225. 1983)
GB/T 5779.1 Fasteners - Surface Discontinuities-Bolts, Screws and Studs for General
Requirements (GB/T 5779.1-2000, IDT ISO 6157-1. 1988)
GB/T 5779.3 Fasteners - Surface Discontinuities-Bolts, Screws and Studs for Special
Requirements (GB/T 5779.3-2000, IDT ISO 6157-3. 1988)
GB/T 16938 Fasteners - General Requirements for Blots, Screws, Studs and Nuts
(GB/T 16938-2008, ISO 8839. 2005, IDT)
3 Dimensions
3.1 Dimensions
Type dimensions are shown in Figure 1 and Table 1.
Dimension symbols and marking shall comply with GB/T 5276.
broken, the fracture may occur at part of the thread, the head or the join of head-pole.
Table 3 Minimum tensile loading of hexagon countersunk head screws
(80% of specified value by GB/T 3098.1)
Thread size d
Performance grade
8.8 10.9 12.9
Minimum tensile load / N
M3 3220 4180 4910
M4 5620 7300 8560
M5 9080 11800 13800
M6 12900 16700 19600
M8 23400 30500 35700
M10 37100 48200 56600
M12 53900 70200 82400
M14 73600 96000 112000
M16 100000 130000 154000
M20 162000 204000 239000
5 Mark
5.1 Marking method
Marking method shall be according to the provisions of GB/T 1237.
5.2 Marking example
Marking of hexagon socket countersunk head screws with - thread size d = M12, nominal length l =
40 mm, performance grade is grade 8.8, oxidized surface, and class A.
Screw GB/T 70.3 M12×40
......
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