GB/T 16674.2-2016 English PDF (GB/T16674.2-2016)

GB/T 16674.2-2016: Hexagon bolts with flange -- Fine pitch thread -- Small series
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GB/T 16674.2-2016
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 21.060.10
J 13
Replacing GB/T 16674.2-2004
Hexagon Bolts with Flange –
Fine Pitch Thread – S mall Series
(ISO 15072.2012, Hexagon Bolts with Flange with Metric Fine
Pitch Thread – Small Series – Product Grade A, MOD)
ISSUED ON. FEBRUARY 24, 2016
IMPLEMENTED ON. JUNE 1, 2016
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the People's Republic of China;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 3 
1 Scope ... 5 
2 Normative References ... 5 
3 Dimensions ... 6 
4 Requirements and Reference Standards ... 11 
5 Designation ... 11 
Annex A (Normative) Gauging of Hexagon Flange Heads ... 13 
Foreword
This Part of GB/T 16674 belongs to a complete group of national standards “Hexagon
Bolts with Flange”. It comprises the following.
-- GB/T 5789 Hexagon Flange Bolts – Heavy Series – Product Grade B
-- GB/T 5790 Hexagon Flange Bolts – Heavy Series – Reduced Shank – Product
Grade B
-- GB/T 16674.1 Hexagon Bolts with Flange – Small Series
-- GB/T 16674.2 Hexagon Bolts with Flange – Fine Pitch Thread – Small Series
This Part is the 2nd Part of GB/T 16674.
This Part was drafted in accordance with the rules given in GB/T 1.1-2009.
This Part replaces GB/T 16674.2-2004, Hexagon Bolts with Flange – Fine Pitch Thread
– Small Series. Compared with GB/T 16674.2-2004, the main technical differences are
as follows.
-- it adds steel bolts grade 12.9 (Chapter 1);
-- it deletes “If, in special cases, specifications other than those listed in this
Standard are required, they can be selected from existing Standards, ... GB/T
3098.6 and GB/T 3103.1.” (Chapter 1, Edition 2004);
-- it adds for the surface defects of steel bolts. for products grades 8.8, 9.8 and 10.9,
in accordance with the specifications of GB/T 5779.1 (Table 2);
-- it adds that the surface of steel bolts is as processed and deletes surface oxidation
treatment (Table 2);
-- it adds the technical requirements of non-electrolytically applied zinc flake
coatings of steel bolts in accordance with GB/T 5276.2 (Table 2);
-- it adds the technical requirements of passivating treatment of stainless steel bolts
in accordance with GB/T 5267.4 (Table 2); and
-- it is only allowed to omit in Designation that the surface is as processed, instead
of oxidation treatment (5.2).
This Part was redrafted by reference to ISO 15072.2012, Hexagon Bolts with Flange
with Metric Fine Pitch Thread – Small Series – Product Grade A (English Edition).
The technical differences between this Part and ISO 15072.2012 and their reasons are
as follows.
-- it deletes the specification of ISO 15072.2012, “If, in special cases, specifications
other than those listed in this International Standard are required, they can be
selected from existing International Standards, ... ISO 965-2 and ISO 3506-1”
(Chapter 1), which does not belong to the content of this Standard;
-- in the Normative References, it uses Chinese standards to replace the
international standards (Chapter 2), adds the references of GB/T 90.2 (Table 2),
GB/T 5779.1 (Table 2) and GB/T 1237 (5.1), in order to meet Chinese basic
standards of fasteners;
-- it adds for the surface defects of steel bolts. for products grades 8.8, 9.8 and 10.9,
in accordance with the specifications of GB/T 5779.1 (Table 2);
-- it adds the technical requirements of packaging (Table 2), in order to meet
Chinese basic standards of fasteners; and
-- it modifies the Designation Example into the simplified Designation Examples
(5.2), in order to meet the specifications of GB/T 1237.
The following editorial modifications are made in this Standard.
-- it changes the name of the standard; and
-- it deletes the Bibliography of ISO 15072.
This Part was proposed by China Machinery Industry Federation.
This Part shall be under the jurisdiction of the National Standardization Technical
Committee on Fasteners (SAC/TC 85).
The responsible drafting organization of this Part. China Productivity Center for
Machinery.
The participating drafting organization of this Part. Ningbo Ningli High-Strength
Fastener Industrial Co., Ltd.
This Part shall be interpreted by the Secretariat of the National Standardization
Technical Committee on Fasteners.
The previous edition replaced by this Part is as follows.
-- GB/T 16674.2-2004
Hexagon Bolts with Flange –
Fine Pitch Thread – Small Series
1 Scope
This Part of GB/T 16674 specifies the dimensions, requirements and designation of
hexagon bolts with flange with metric fine pitch thread, small series.
This Part applies to hexagon bolts with flange with metric fine pitch thread, small series,
with product grade A, and with nominal thread diameter from 8 mm up to and including
16 mm and property class 8.8, 9.8, 10.9, 12.9/12.9 and A2-70.
2 Normative References
The following referenced documents are indispensable for the application of this
document. For dated references, only the edition dated applies to this document. For
undated references, the latest edition of the referenced document (including any
amendments) applies to this Standard.
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, ISO 3269.2000,
IDT)
GB/T 90.2 Fasteners – Marking and Packaging (GB/T 90.2-2002)
GB/T 193 General Purpose Metric Screw Threads – Diameters and Pitches (GB/T
193-2003, ISO 261.1998, ISO General Purpose Metric Screw Threads – General
Plan, 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 3098.6-2014, ISO 3506-1.2009, MOD)
GB/T 3103.1 Essential Oils and Aromatic Extracts – Determination of Residual
Benzene Content (GB/T 3103.1-2002, ISO 4759-1.2000, IDT)
GB/T 5267.1 Fasteners – Electroplated Coatings (GB/T 5267.1-2002, ISO
GB/T 16674.2-2016
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 21.060.10
J 13
Replacing GB/T 16674.2-2004
Hexagon Bolts with Flange –
Fine Pitch Thread – S mall Series
(ISO 15072.2012, Hexagon Bolts with Flange with Metric Fine
Pitch Thread – Small Series – Product Grade A, MOD)
ISSUED ON. FEBRUARY 24, 2016
IMPLEMENTED ON. JUNE 1, 2016
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the People's Republic of China;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 3 
1 Scope ... 5 
2 Normative References ... 5 
3 Dimensions ... 6 
4 Requirements and Reference Standards ... 11 
5 Designation ... 11 
Annex A (Normative) Gauging of Hexagon Flange Heads ... 13 
Foreword
This Part of GB/T 16674 belongs to a complete group of national standards “Hexagon
Bolts with Flange”. It comprises the following.
-- GB/T 5789 Hexagon Flange Bolts – Heavy Series – Product Grade B
-- GB/T 5790 Hexagon Flange Bolts – Heavy Series – Reduced Shank – Product
Grade B
-- GB/T 16674.1 Hexagon Bolts with Flange – Small Series
-- GB/T 16674.2 Hexagon Bolts with Flange – Fine Pitch Thread – Small Series
This Part is the 2nd Part of GB/T 16674.
This Part was drafted in accordance with the rules given in GB/T 1.1-2009.
This Part replaces GB/T 16674.2-2004, Hexagon Bolts with Flange – Fine Pitch Thread
– Small Series. Compared with GB/T 16674.2-2004, the main technical differences are
as follows.
-- it adds steel bolts grade 12.9 (Chapter 1);
-- it deletes “If, in special cases, specifications other than those listed in this
Standard are required, they can be selected from existing Standards, ... GB/T
3098.6 and GB/T 3103.1.” (Chapter 1, Edition 2004);
-- it adds for the surface defects of steel bolts. for products grades 8.8, 9.8 and 10.9,
in accordance with the specifications of GB/T 5779.1 (Table 2);
-- it adds that the surface of steel bolts is as processed and deletes surface oxidation
treatment (Table 2);
-- it adds the technical requirements of non-electrolytically applied zinc flake
coatings of steel bolts in accordance with GB/T 5276.2 (Table 2);
-- it adds the technical requirements of passivating treatment of stainless steel bolts
in accordance with GB/T 5267.4 (Table 2); and
-- it is only allowed to omit in Designation that the surface is as processed, instead
of oxidation treatment (5.2).
This Part was redrafted by reference to ISO 15072.2012, Hexagon Bolts with Flange
with Metric Fine Pitch Thread – Small Series – Product Grade A (English Edition).
The technical differences between this Part and ISO 15072.2012 and their reasons are
as follows.
-- it deletes the specification of ISO 15072.2012, “If, in special cases, specifications
other than those listed in this International Standard are required, they can be
selected from existing International Standards, ... ISO 965-2 and ISO 3506-1”
(Chapter 1), which does not belong to the content of this Standard;
-- in the Normative References, it uses Chinese standards to replace the
international standards (Chapter 2), adds the references of GB/T 90.2 (Table 2),
GB/T 5779.1 (Table 2) and GB/T 1237 (5.1), in order to meet Chinese basic
standards of fasteners;
-- it adds for the surface defects of steel bolts. for products grades 8.8, 9.8 and 10.9,
in accordance with the specifications of GB/T 5779.1 (Table 2);
-- it adds the technical requirements of packaging (Table 2), in order to meet
Chinese basic standards of fasteners; and
-- it modifies the Designation Example into the simplified Designation Examples
(5.2), in order to meet the specifications of GB/T 1237.
The following editorial modifications are made in this Standard.
-- it changes the name of the standard; and
-- it deletes the Bibliography of ISO 15072.
This Part was proposed by China Machinery Industry Federation.
This Part shall be under the jurisdiction of the National Standardization Technical
Committee on Fasteners (SAC/TC 85).
The responsible drafting organization of this Part. China Productivity Center for
Machinery.
The participating drafting organization of this Part. Ningbo Ningli High-Strength
Fastener Industrial Co., Ltd.
This Part shall be interpreted by the Secretariat of the National Standardization
Technical Committee on Fasteners.
The previous edition replaced by this Part is as follows.
-- GB/T 16674.2-2004
Hexagon Bolts with Flange –
Fine Pitch Thread – Small Series
1 Scope
This Part of GB/T 16674 specifies the dimensions, requirements and designation of
hexagon bolts with flange with metric fine pitch thread, small series.
This Part applies to hexagon bolts with flange with metric fine pitch thread, small series,
with product grade A, and with nominal thread diameter from 8 mm up to and including
16 mm and property class 8.8, 9.8, 10.9, 12.9/12.9 and A2-70.
2 Normative References
The following referenced documents are indispensable for the application of this
document. For dated references, only the edition dated applies to this document. For
undated references, the latest edition of the referenced document (including any
amendments) applies to this Standard.
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, ISO 3269.2000,
IDT)
GB/T 90.2 Fasteners – Marking and Packaging (GB/T 90.2-2002)
GB/T 193 General Purpose Metric Screw Threads – Diameters and Pitches (GB/T
193-2003, ISO 261.1998, ISO General Purpose Metric Screw Threads – General
Plan, 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 3098.6-2014, ISO 3506-1.2009, MOD)
GB/T 3103.1 Essential Oils and Aromatic Extracts – Determination of Residual
Benzene Content (GB/T 3103.1-2002, ISO 4759-1.2000, IDT)
GB/T 5267.1 Fasteners – Electroplated Coatings (GB/T 5267.1-2002, ISO