GB/T 800-2020 English PDF (GB/T800-2020)

GB/T 800-2020: Countersunk Head Double Nib Bolts
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GB/T 800-2020
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 21.060.10
J 13
Replacing GB/T 800-1988
Countersunk Head Double Nib Bolts
沉头双榫螺栓
ISSUED ON: NOVEMBER 19, 2020
IMPLEMENTED ON: JUNE 1, 2021
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of
China.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative References ... 4 
3 Types and Dimensions ... 5 
4 Technical Conditions and Reference Standards ... 6 
5 Marking ... 7 
Foreword
This Standard is one of the “countersunk head bolts” series of national standards. This
series of standards include:
---GB/T 10 Countersunk Head Square Neck Bolts;
---GB/T 11 Countersunk Head Nib Bolts;
---GB/T 800 Countersunk Head Double Nib Bolts.
This Standard was drafted in accordance with the rules in GB/T 1.1-2009.
This Standard serves as a replacement of GB/T 800-1988 Flat Countersunk Double
Nib Bolts. In comparison with GB/T 800-1988, the main technical changes are as
follows:
---General technical requirements are added (GB/T 16938) (see Table 2);
---The technical requirements for non-electrolytically applied zinc flake coatings
(GB/T 5267.2) and hot dip galvanized coatings (GB/T 5267.3) are added (see
Table 2).
This Standard also makes the following editorial modification:
---The English title of the Standard is modified.
This Standard was proposed by China Machinery Industry Federation.
This Standard shall be under the jurisdiction of National Technical Committee 85 on
Fasteners of Standardization Administration of China (SAC/TC 85).
The drafting organizations of this Standard: China Productivity Center for Machinery;
Yuhuan Tianye Machinery Co., Ltd.; Shanghai Fastener and Welding Material
Technology Research Institute Co., Ltd.; Taizhou Liangbiao Technology Information
Service Co., Ltd.; General Parts Product Quality Supervision and Testing Center for
Machinery Industry.
National Technical Committee 85 on Fasteners of Standardization Administration of
China is responsible for the interpretation of this Standard.
The issuing of the previous versions:
---GB 800-1977, GB/T 800-1988.
Countersunk Head Double Nib Bolts
1 Scope
This Standard specifies the types and dimensions, technical conditions, reference
standards and markings of countersunk head double nib bolts.
This Standard is applicable to countersunk head double nib bolts with a thread
specification of M6 ~ M12, performance grade of Grade 4.8 and product grade of
Grade C.
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 90.1 Fasteners - Acceptance Inspection
GB/T 90.2 Fasteners - Marking and Packaging
GB/T 196 General Purpose Metric Screw Threads - Basic Dimensions
GB/T 197 General Purpose Metric Screw Threads - Tolerances
GB/T 1237 Designation System for Fasteners
GB/T 3098.1 Mechanical Properties of Fasteners - Bolts, Screws and Studs
GB/T 3103.1 Tolerances for Fasteners - Bolts, Screws and Nuts
GB/T 5267.1 Fasteners - Electroplated Coatings
GB/T 5267.2 Fasteners - Non-electrolytically Applied Zinc Flake Coatings
GB/T 5267.3 Fasteners - Hot Dip Galvanized Coatings
GB/T 5276 Fasteners - Bolts, Screws, Studs and Nuts - Symbols and Descriptions of
Dimensions
GB/T 5779.1 Fasteners - Surface Discontinuities - Bolts, Screws and Studs for General
GB/T 800-2020
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 21.060.10
J 13
Replacing GB/T 800-1988
Countersunk Head Double Nib Bolts
沉头双榫螺栓
ISSUED ON: NOVEMBER 19, 2020
IMPLEMENTED ON: JUNE 1, 2021
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of
China.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative References ... 4 
3 Types and Dimensions ... 5 
4 Technical Conditions and Reference Standards ... 6 
5 Marking ... 7 
Foreword
This Standard is one of the “countersunk head bolts” series of national standards. This
series of standards include:
---GB/T 10 Countersunk Head Square Neck Bolts;
---GB/T 11 Countersunk Head Nib Bolts;
---GB/T 800 Countersunk Head Double Nib Bolts.
This Standard was drafted in accordance with the rules in GB/T 1.1-2009.
This Standard serves as a replacement of GB/T 800-1988 Flat Countersunk Double
Nib Bolts. In comparison with GB/T 800-1988, the main technical changes are as
follows:
---General technical requirements are added (GB/T 16938) (see Table 2);
---The technical requirements for non-electrolytically applied zinc flake coatings
(GB/T 5267.2) and hot dip galvanized coatings (GB/T 5267.3) are added (see
Table 2).
This Standard also makes the following editorial modification:
---The English title of the Standard is modified.
This Standard was proposed by China Machinery Industry Federation.
This Standard shall be under the jurisdiction of National Technical Committee 85 on
Fasteners of Standardization Administration of China (SAC/TC 85).
The drafting organizations of this Standard: China Productivity Center for Machinery;
Yuhuan Tianye Machinery Co., Ltd.; Shanghai Fastener and Welding Material
Technology Research Institute Co., Ltd.; Taizhou Liangbiao Technology Information
Service Co., Ltd.; General Parts Product Quality Supervision and Testing Center for
Machinery Industry.
National Technical Committee 85 on Fasteners of Standardization Administration of
China is responsible for the interpretation of this Standard.
The issuing of the previous versions:
---GB 800-1977, GB/T 800-1988.
Countersunk Head Double Nib Bolts
1 Scope
This Standard specifies the types and dimensions, technical conditions, reference
standards and markings of countersunk head double nib bolts.
This Standard is applicable to countersunk head double nib bolts with a thread
specification of M6 ~ M12, performance grade of Grade 4.8 and product grade of
Grade C.
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 90.1 Fasteners - Acceptance Inspection
GB/T 90.2 Fasteners - Marking and Packaging
GB/T 196 General Purpose Metric Screw Threads - Basic Dimensions
GB/T 197 General Purpose Metric Screw Threads - Tolerances
GB/T 1237 Designation System for Fasteners
GB/T 3098.1 Mechanical Properties of Fasteners - Bolts, Screws and Studs
GB/T 3103.1 Tolerances for Fasteners - Bolts, Screws and Nuts
GB/T 5267.1 Fasteners - Electroplated Coatings
GB/T 5267.2 Fasteners - Non-electrolytically Applied Zinc Flake Coatings
GB/T 5267.3 Fasteners - Hot Dip Galvanized Coatings
GB/T 5276 Fasteners - Bolts, Screws, Studs and Nuts - Symbols and Descriptions of
Dimensions
GB/T 5779.1 Fasteners - Surface Discontinuities - Bolts, Screws and Studs for General