GB/T 819.2-2016 (GB/T819.2-2016, GBT 819.2-2016, GBT819.2-2016) & related versions
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| GB/T 819.2-2016 | English | 90 |
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Countersunk flat head screws with cross recess -- Part 2: Property class 8.8, stainless steel screws and non-ferrous metal screws
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GB/T 819.2-2016
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GBT 819.2-2016
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| GB/T 819.2-1997 | English | 70 |
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Cross recessed countersunk flat head screws(common head style) - Grade A - Part 2: Steel of property class 8 - 8, stainless and non-ferrous metals
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GB/T 819.2-1997
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GBT 819.2-1997
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GB/T 819.2-2016
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 21.060.10
J 13
Replacing GB/T 819.2-1997
Countersunk Flat Head Screws with Cross Recess –
Part 2. Property Class 8.8, Stainless Steel Screws and
Non-Ferrous Metal Screws
[ISO 7046-2.2011, Countersunk Flat Head Screws (Common Head Style) with
Type H or Type Z Cross Recess – Product Grade A – Part 2. Steel Screws of
Property Class 8.8, Stainless Steel Screws and Non-Ferrous Metal Screws,
MOD]
ISSUED ON. FEBRUARY 24, 2016
IMPLEMENTED ON. JUNE 1, 2016
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 6
2 Normative References ... 6
3 Dimension ... 7
4 Technical Conditions and Reference Standards ... 10
5 Markings ... 11
Foreword
This Part is one of the serial national standards of “Slotted Screws and Cross Recess
Screws”, such series include.
--- GB/T 65 Slotted Cheese Head Screws;
--- GB/T 67 Slotted Pan Head Screws;
--- GB/T 68 Slotted Countersunk Flat Head Screws;
--- GB/T 69 Slotted Raised Countersunk Head Screws;
--- GB/T 818 Pan Head Screws with Cross Recess;
--- GB/T 819.1 Countersunk Flat Head Screws with Cross Recess – Part 1. Property
Class 4.8;
--- GB/T 819.2 Countersunk Flat Head Screws with Cross Recess – Part 2. Property
Class 8.8, Stainless Steel Screws and Non-Ferrous Metal Screws;
--- GB/T 820 Raised Countersunk Head Screws with Cross Recess;
--- GB/T 822 Cross Recessed Cheese Head Screws;
--- GB/T 823 Cross Recessed Small Pan Head Screws;
--- GB/T 13806.1 Fasteners for Fine Mechanics - Cross Recessed Screws.
This Part was drafted as per the rules specified in GB/T 1.1-2009.
This Part replaced GB/T 819.2-1997 Countersunk Flat Head Screws with Cross
Recess – Part 2. Steel Property Class 8.8, Stainless Steel A2-70 and Non-Ferrous
Metal CU2 or CU3; compared with GB/T 819.2-1997, the major technical changes are
as follows.
--- Delete “if under special conditions, the technical conditions specified beyond this
Standard, ... GB 3106 and GB 9145” (Chapter 1 of 1997 Edition);
--- Unify the reference thread standards into GB/T 193, GB/T 9145 (see Chapter 2);
--- add “d< 3mm, as per agreement” to the property class of steel and non-ferrous
metal screws (see Table 2);
--- Add the steel screws non--electrolytically applied zinc flake coating technical
requirements as per GB/T 5267.2 (see Table 2);
--- Add the stainless-steel screws passivation treatment technical requirements as
Countersunk Flat Head Screws with Cross Recess –
Part 2. Property Class 8.8, Stainless Steel Screws and
Non-Ferrous Metal Screws
1 Scope
This Part of GB/T 819 specifies the type and dimension, technical conditions and
markings of stainless steel and non-ferrous metal countersunk flat head screws with
cross recess and property class 8.8.
This Part is applicable to Type-H and Type-Z countersunk flat head screws with cross
recess for Thread Specification M2~M10, Property Class 8.8, A2-70, CU2, CU3,
Product Grade A.
2 Normative References
The following documents are essential to the application of 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) are applicable to this document.
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 193 General Purpose Screw Threads – Diameters and Pitches (GB/T 193-
2003, ISO 261.1998, MOD)
GB/T 944.1 Cross Recesses for Screws (GB/T 944.1-1985, eqv ISO 4757.1983)
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 3098.10 Mechanical Properties of Fasteners –Bolts, Screws and Studs
Made of Non-Ferrous Metals (GB/T 3908.10-1993, eqv ISO 8839.1986)
GB/T 3103.1 Tolerances for Fasteners – Bolts, Screws and Nuts (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
5267.2-2002, ISO 10683.2000, IDT)
GB/T 5267.4 Passivation of Corrosion – Resistant Stainless – Steel Fasteners
(GB/T 5267.4-2009, ISO 16048.2003, 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 5279.2 Countersunk Flat Head Screws - Part 2. Penetration Depth of Cross
Recesses (GB/T 5279.2-1997, idt ISO 7721-2.1990)
GB/T 5779.1 Fastener – Surface Discontinues – Bolts, Screws and Studs for
General Requirements (GB/T 5779.1-2000, idt ISO 6157-1.1988)
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 Dimension
The type and dimension of screws can refer to Figure 1 and Table 1.
The dimension codes and markings shall conform to GB/T 5276.
The shank diameter of the part without thread equals to the medium diameter of thread
or allows equaling to the large diameter of thread.
Screw GB/T 819.2 M5×20
If insert depth series are needed to designate, the type and series number of cross
recess shall be indicated in the marking, e.g.. Type-H, Series 1.
Screw GB/T 819.2 M5×20 H1
......
GB/T 819.2-1997
ICS 21.060.10
J 13
GB
National Standard
of the People’s Republic of China
idt ISO 7046-2.1990
Cross recessed countersunk flat head screws
(common head style) - Grade A - Part 2.
Steel of property class 8.8, stainless and
non-ferrous metals
ISSUED ON. AUGUST 5, 1997
IMPLEMENTED ON. FEBRUARY 01, 1998
Issued by. The State Bureau of Technical Supervision
Table of Contents
Foreword ... 3
ISO Foreword ... 4
ISO Introduction ... 5
1 Scope ... 6
2 Quoted Standards ... 6
3 Dimensions ... 7
4 Technical conditions ... 10
5 Mark ... 10
Foreword
This Standard equivalently adopts international standard ISO 7046-2.1990 "Cross recessed
countersunk flat head screws (common head style) - Grade A - Part 2. Steel of property class 8.8,
stainless and non-ferrous metals".
General title of GB/T 819 is "Cross recessed countersunk flat head screws", it includes following
sections.
- Part 1. Steel 4.8 (It shall be revised according to ISO 7046-1.1994, and it shall be published
according to GB/T 819.1);
- Part 2. Steel 8.8, stainless steel A2-70 and non-ferrous metal CU2 or CU3.
This Standard was proposed by the Ministry of Machinery Industry of the People's Republic of
China.
This Standard shall be under the jurisdiction of the National Fasteners Standardization Technical
Committee.
This Standard was responsibly drafted by Machinery Research Institute of Ministry of Machinery
Industry.
ISO Foreword
ISO (International Standardization Organization) is a syndicate consisting of state standard group
(members of ISO) across the world. The formulation of the international standard is made by all technical
committees of ISO. Each member who is interested in projects of certain technical committee can
participate in the committee. Governmental and non-governmental international organizations related
with ISO can also take part in the job. ISO is closely related with IEC in terms of electro-technical
normalization.
International standard draft adopted by technical committee shall be distributed to all member groups for
voting. The official publication of international standards needs at least 75% votes by the member
groups.
International standard ISO 7046-2 was formulated by ISO/TC2 Fasteners Technical Committee.
General title of ISO 7721 "Cross recessed countersunk flat head screws (common head style)
Grade A", it includes following sections.
- Part 1. Property class Steel 4.8 (ISO 7046-1.1994);
- Part 2. Property class Steel 8.8, stainless steel and non-ferrous metals.
ISO Introduction
Insertion depth of cross recessed of countersunk flat head screws
Insertion depth of cross recessed of countersunk flat head screws must meet requirements at 2
aspects. That is, for a given head size, it shall meet the conflicting requirements.
First of all, it requires enough head strength, so as to achieve the ensured load and failure load
specified by various property classes. A shallow cross recessed head can increase the head
strength. On the other hand, screwing performance of the screws shall be satisfactory, which can
only adopt deep-enough cross recessed.
Formulation of ISO 7721-2 is to seek a comprehensive solution to meet the 2 requirements, the
solution shall also consider the long-term requirements as possible.
For low strength countersunk screws, ISO 7721-2 specifies shallow cross recessed. It can achieve
good screwing performance, while the head strength is sufficient. This result shall be used in ISO
7046-1 (see Preface).
For higher strength screws, sufficient head strength can only use the shallow cross recessed
insertion depth. If the screw also requires good screwing performance, then, under the conditions of
universal head, a shoulder must be added under the head, so as to ensure that there is sufficient
head strength and larger insertion depth. ISO 7046 can meet these 2 requirements.
This comprehensive solution, except that the interchangeability of head type of cross recessed
countersunk screw is different, is currently the only way to achieve the international level
agreements.
National Standard of the People’s Republic of China
Cross recessed countersunk flat head screws
(common head style) - Grade A - Part 2.
Steel of property class 8.8, stainless and
non-ferrous metals
idt ISO 7046-2.1990
1 Scope
This Standard specifies the cross recessed countersunk flat head screws - thread size of M2 - M10,
property class is. steel 8.8, stainless steel A2-70, and non-ferrous metals CU2 or CU3.
If there are such special conditions that require the technical conditions beyond the provisions of
this Standard, it shall select from existing national standards, such as GB 193, GB 3098.1, GB
3098.6, GB/T 3098.10, GB 3103.1, GB 3106, and GB 9145.
2 Quoted Standards
The following standards contain provisions which, through reference in this Standard, constitute
provisions of this Standard. At time of publication, the editions indicated are valid. All standards are
subject to revision. The parties who are using this Standard shall explore the possibility of using the
latest version of the following standards.
GB 90-85 Acceptance Inspection, Marking and Packaging of Fasteners
GB 193-81 General purpose screw threads - Diameters and pitches (diameter 1 - 600 mm)
GB 944.1-85 Cross recesses for screws
GB 1237-88 Designation system for fasteners
GB 3098.1-82 Mechanical properties of fasteners - Bolts, screws and studs (1988 confirmation)
GB 3098.6-86 Fasteners and mechanical properties of stainless steel bolts, screws, studs and
nuts
GB/T 3098.10-93 Mechanical properties of fasteners Bolts, screws, studs and nuts made of
non-ferrous metals
GB 3103.1-82 Tolerances for fasteners bolts, screws and nuts (confirmed in 1988)
GB 3106-82 Bolts, screws and studs - Nominal length and ordinary bolt thread length
(confirmed in 1988)
GB 5267-85 Electroplated coatings on threaded fasteners
GB 5276-85 Fasteners - Bolts, screws, studs and nuts - Symbols and designations of
dimensions
GB 5279-85 Countersunk head screws - Head configuration and gauging
GB/T 5279.2-1997 Countersunk flat head screws - Part 2. Penetration depth of cross recesses
GB 5779.1-86 Fasteners. Surface discontinuities. Bolts, screws and studs for general
requirements
GB 5779.3-86 Fasteners. Surface discontinuities. Bolts, screws and studs for special
requirements
GB 9145-88 General purpose screw threads - Limits of sizes for commercial bolt and nut
threads - Medium quality
3 Dimensions
Type size shall be specified according to Figures 1, 2, 3 and Table 1.
Rod diameter is approximately equal to the medium diameter or equal to the large diameter.
Note. Dimension code and marking shall be specified according to GB 5276.
If there are special circumstances which need to specify one of the two series, then the digit of that
series (e.g., Series 1) shall be indicated in the marking.
Screw GB/T 819.2 M5×20-H1
......
| Standard ID | GB/T 819.2-2016 (GB/T819.2-2016) | | Description (Translated English) | Countersunk flat head screws with cross recess -- Part 2: Property class 8.8, stainless steel screws and non-ferrous metal screws | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | J13 | | Classification of International Standard | 21.060.10 | | Word Count Estimation | 11,160 | | Date of Issue | 2016-02-24 | | Date of Implementation | 2016-06-01 | | Older Standard (superseded by this standard) | GB/T 819.2-1997 | | Quoted Standard | GB/T 90.1; GB/T 90.2; GB/T 193; GB/T 944.1; GB/T 1237; GB/T 3098.1; GB/T 3098.6; GB/T 3098.10; GB/T 3103.1; GB/T 5267.1; GB/T 5267.2; GB/T 5267.4; GB/T 5276; GB/T 5279; GB/T 5279.2; GB/T 5279.1; GB/T 9145; GB/T 16938 | | Adopted Standard | ISO 7046-2-2011, MOD | | Drafting Organization | Productivity Promotion Center in the machine | | Administrative Organization | National Fastener Standardization Technical Committee (SAC/TC 85) | | Regulation (derived from) | National Standard Announcement No | | 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 8.8 type, stainless steel and non-ferrous metal cross-shaped countersunk head screw type size, technical conditions and markings. This standard applies to H and Z type cross recessed countersunk screws with thread grade M2 ??to M10, performance classes 8.8, A2-70, CU2, CU3, grade A of the product. | | Standard ID | GB/T 819.2-1997 (GB/T819.2-1997) | | Description (Translated English) | Cross recessed countersunk flat head screws(common head style) - Grade A - Part 2: Steel of property class 8 - 8, stainless and non-ferrous metals | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | J13 | | Classification of International Standard | 21.060.10 | | Word Count Estimation | 8,834 | | Date of Issue | 1997/8/5 | | Date of Implementation | 1998/2/1 | | Adopted Standard | ISO 7046-2-1990, IDT | | Drafting Organization | Ministry of Science and Research Institute of Machinery Industry Machinery | | Administrative Organization | National Standardization Technical Committee fasteners | | Summary | This standard specifies the thread size of M2 ~ M10, performance levels are: 8. 8 steel, stainless steel and non-ferrous metals A2-70 CU2 or CU3 Phillips head screws. If, in exceptional circumstances, requiring technical conditions other than those specified in this standard, select from existing national standards should be, as GB 193, GB 3098. 1, GB 3098. 6, GB/T 3098. 10, GB 3103. 1, GB 3106 and GB 9145. |
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