GB/T 2673.2-2020 English PDF (GBT2673.2-2020)

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GB/T 2673.2-2020: Hexalobular socket high countersunk head screws
GB/T 2673.2-2020
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 21.060.10
J 13
Hexalobular Socket High Countersunk Head Screws
内六角花形高沉头螺钉
(ISO 14582:2013, Fasteners - Hexalobular Socket Countersunk Head
Screws, High Head, MOD)
ISSUED ON: MARCH 6, 2020
IMPLEMENTED ON: OCTOBER 1, 2020
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword ... 3 
1 Scope ... 5 
2 Normative References ... 5 
3 Type Dimensions ... 6 
4 Technical Conditions and Reference Standards ... 9 
5 Marking ... 10 
6 Designation ... 10 
Bibliography ... 11 
Foreword
This Part is one of the series standards of “Hexalobular Socket Screws”. This series includes:
---GB/T 2671.1 Hexalobular Socket Cheese (short) Head Screws;
---GB/T 2671.2 Hexalobular Socket Head Cap Screws;
---GB/T 2672 Hexalobular Socket Pan Head Screws;
---GB/T 2673.1 Hexalobular Socket Countersunk Flat Head Screws;
---GB/T 2673.2 Hexalobular Socket High Countersunk Head Screws;
---GB/T 2674 Hexalobular Socket Raised Countersunk Head Screws.
This is Part 2 of GB/T 2673.
This Part was drafted in accordance with the rules provided in GB/T 1.1-2009.
This Part uses the re-drafting method in the modification and adopt of ISO 14582:2013
Fasteners - Hexalobular Socket Countersunk Head Screws, High Head.
In comparison with ISO 14582:2013, the technical differences and the causes for these
differences are as follows:
---The stipulation of ISO 14582:2013 “if other technical requirements are required, ……
choose from ISO 4759-1.” is deleted (see Chapter 1 of ISO 14582:2013), because it
does not belong to the content specified in this Part;
---In Normative References, Chinese standards are used to replace international standards
(see Chapter 2), and the references GB/T 2, GB/T 90.2 (see Table 2), GB/T 1237 (see
Chapter 6) and GB/T 5267.4 (see Table 2) are added, so as to comply with the
fundamental standards on fasteners in our country;
---The technical requirements for packaging are added (see Table 2), so as to comply with
the fundamental standards on fasteners in our country;
---The designation example is modified into simplified designation example (see 6.2), so
as to comply with the stipulations of GB/T 1237.
This Part also makes the following editorial modifications:
---The title of the Standard is modified;
---The “Bibliography” is modified.
This Part was proposed by China Machinery Industry Federation.
Hexalobular Socket High Countersunk Head Screws
1 Scope
This Part of GB/T 2673 specifies the type dimensions, technical conditions and markings of
hexalobular socket high countersunk head screws, as well as gauge size that controls the height
of the head.
This Part is applicable to hexalobular socket high countersunk head screws with the thread
specification of M3 ~ M10, the performance grade of 4.8, 8.8 and 10.9, and the product grade
of Grade-A.
NOTE 1: in comparison with ordinary countersunk head screws, the height of the head is slightly
increased, so that the screws can have the full load-bearing capacity that complies with
the stipulations of GB/T 3098.1.
NOTE 2: due to the increased head height, the screws specified in this Part are not completely
interchangeable with other metric countersunk head screws. The countersink of the
assembled parts also needs to be slightly deeper than the depth specified in GB/T 152.2.
2 Normative References
The following documents are indispensable to the application of this document. In terms of
references with a specified date, only versions with a specified date are applicable to this
document. In terms of references without a specified date, the latest version (including all the
modifications) 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 90.1-2002, idt ISO 3269:2000)
GB/T 90.2 Fasteners - Marking and Packaging
GB/T 193 General Purpose Metric Screw Threads - General Plan (GB/T 193-2003, ISO
261:1998, 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 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 - Electroplated Coatings (GB/T 5267.1-2002, ISO 4042:1999, IDT)
GB/T 5267.2 Fasteners - Non-electrolytically Applied Zinc Flake Coatings (GB/T 5267.2-2017,
ISO10683:2014, MOD)
GB/T 5267.3 Fasteners - Hot Dip Galvanized Coatings (GB/T 5267.3-2008, ISO 10684:2004,
IDT)
GB/T 5276 Fasteners - Bolts, Screws, Studs and Nuts - Symbols and Descriptions of
Dimensions (GB/T 5276-2015, ISO 225:2010, MOD)
GB/T 5279 Countersunk Head Screws - Head Configuration and Gauging (GB/T 5279-1985,
idt ISO 7721:1983)
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 6188 Hexalobular Internal Driving Feature for Bolts and Screws (GB/T 6188-2017, ISO
10664:2014, IDT)
GB/T 9145 General Purpose Metric Screw Threads - Limits of Sizes for the Screw Threads of
Medium Quality and Preferable Plan (GB/T 9145-2003, ISO 965-2:1998, MOD)
GB/T 16938 Fasteners - General Requirements for Bolts, Screws, Studs and Nuts (GB/T 16938-
2008, ISO 8992:2005, IDT)
3 Type Dimensions
The type dimensions of the screws are shown in Figure 1, Figure 2 and Table 1.
The symbols and descriptions of dimensions shall comply with GB/T 5276.