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GB/T 1231-2024: High strength bolts with large hexagon head assemblies for steel structures
Status: Valid GB/T 1231: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 1231-2024 | English | 529 |
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High strength bolts with large hexagon head assemblies for steel structures
| Valid |
GB/T 1231-2024
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| GB/T 1231-2006 | English | 399 |
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Specifications of high strength bolts with large hexagon head, large hexagon nuts, plain washers for steel structures
| Valid |
GB/T 1231-2006
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| GB/T 1231-1991 | English | 359 |
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Specifications of high strength bolts with large hexagon head, large hexagon nuts, plain washers for steel structures
| Obsolete |
GB/T 1231-1991
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PDF similar to GB/T 1231-2024
Basic data | Standard ID | GB/T 1231-2024 (GB/T1231-2024) | | Description (Translated English) | High strength bolts with large hexagon head assemblies for steel structures | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | J13 | | Classification of International Standard | 21.060.10; 21.060.20; 21.060.30 | | Word Count Estimation | 26,221 | | Date of Issue | 2024-09-29 | | Date of Implementation | 2025-04-01 | | Older Standard (superseded by this standard) | GB/T 1228-2006,GB/T 1229-2006,GB/T 1230-2006,GB/T 1231-2006 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 1231-2024: High strength bolts with large hexagon head assemblies for steel structures---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
ICS 21.060.10;21.060.20;21.060.30
CCSJ13
National Standard of the People's Republic of China
Replace GB/T 1231-2006, GB/T 1228-2006, etc.
High strength large hexagonal bolt connection for steel structure
Released on 2024-09-29
2025-04-01 Implementation
State Administration for Market Regulation
The National Standardization Administration issued
Table of Contents
Preface III
1 Scope 1
2 Normative references 1
3 Terms and Definitions 2
4 Type 2
5 Size 2
6 Technical Requirements10
7 Test methods 13
8 Inspection Rules 16
9 Marking, marking, labeling, packaging and quality inspection report 16
Appendix A (Normative) 35VB Material Technical Requirements 19
Foreword
This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1.Structure and drafting rules for standardization documents"
Drafting.
This document replaces GB/T 1231-2006 "Technical requirements for high-strength large hexagon head bolts, large hexagon nuts and washers for steel structures".
GB/T 1228-2006 "High-strength large hexagon head bolts for steel structures", GB/T 1229-2006 "High-strength large hexagon nuts for steel structures"
and GB/T 1230-2006 "High Strength Washers for Steel Structures". This document is based on GB/T 1231-2006 and integrates GB/T 1228-
2006, GB/T 1229-2006, GB/T 1230-2006.Compared with GB/T 1231-2006 and other documents, in addition to structural adjustments and
In addition to editorial changes, the main technical changes are as follows.
a) Added bolt connection type diagram (see Chapter 4);
b) Added the specifications of M33 and M36 for large hexagon head bolts, large hexagon nuts and washers in bolted connection pairs (see Chapter 5);
c) The theoretical mass of large hexagon head bolts, large hexagon nuts and washers in bolted joints has been changed (see Chapter 5, GB/T 1228-
2006~Chapter 3 of GB/T 1230-2006);
d) Added gasket type (see 5.3);
e) Added materials used (see 6.1);
f) The requirements for tensile strength, cross-sectional shrinkage and absorbed energy in the mechanical properties of bolt specimens have been changed (see 6.2.1.1, GB/T 1231-
2006, 3.2.1.1);
g) Changed the upper limit of tensile load and core hardness of 10.9S bolt wedge load test (see 6.2.1.2, GB/T 1231-2006
3.2.1.2);
h) Added the provisions for the carburized layer of bolts (see 6.2.1.3);
i) The hardness requirements for 10H nuts have been changed (see 6.2.2.2, 3.2.2.2 of GB/T 1231-2006);
j) The standard deviation of the torque coefficient is changed to the requirement for the coefficient of variation (see 6.3.1, 3.3.1 of GB/T 1231-2006);
k) Added processing requirements for nut threads (see 6.4.3);
l) Added sampling requirements for tensile and impact specimens (see 7.1.1.1);
m) Changed the sampling requirements, notch type and test temperature for bolt impact test (see 7.1.1.3, GB/T 1231-2006
4.1.1.2);
n) The bolt core hardness test method has been changed (see 7.1.3, 4.1.3 of GB/T 1231-2006);
o) Added the bolt carburization test method (see 7.1.4);
p) Added the calculation method of the coefficient of variation in the torque coefficient test (see 7.4.1);
q) The control range of bolt pretension during torque coefficient test has been changed (see 7.4.4, 4.4.4 of GB/T 1231-2006);
r) Added the requirements for the speed of tightening nuts in the torque coefficient test (see 7.4.5);
s) Added inspection rules for decarburization and carburization tests (see 8.4);
t) Added label (see 9.3).
u) The absorbed energy and cold forging requirements for 35VB have been changed (see Appendix A, Appendix A of GB/T 1231-2006).
Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents.
This document was proposed by the China Machinery Industry Federation.
This document is under the jurisdiction of the National Technical Committee on Standardization of Fasteners (SAC/TC85).
This document was drafted by. China Academy of Railway Sciences Group Co., Ltd., China Machinery Productivity Promotion Center Co., Ltd., Shanghai High-intensity
Bolt Factory Co., Ltd., China Railway Bridge Research Institute Co., Ltd., Jinyi Industrial Co., Ltd., Shandong Gaoqiang Fastener Co., Ltd.,
Tieshanqiao Group Co., Ltd., Zhejiang Yeling Industrial Co., Ltd., Mingyang Smart Energy Group Co., Ltd., Shanghai Shenguang High Strength Bolt Co., Ltd.
Company, Shanghai Jinma High Strength Fasteners Co., Ltd., Ningbo Jiulong Chuangzhan Fasteners Co., Ltd., Dingxi High Strength Fasteners Co., Ltd.
Company, Yanqi Lake Basic Manufacturing Technology Research Institute (Beijing) Co., Ltd., CGN Wind Power Co., Ltd., Shaoxing Shannai High Pressure Fasteners Co., Ltd.
Ningbo Ningli High Strength Fasteners Co., Ltd., Shandong Zhongxing Electric Tools Co., Ltd., Ningbo Zhongbin Fasteners Manufacturing Co., Ltd., Beijing
Jinzhaobo High Strength Fasteners Co., Ltd., Zhoushan Zhengyuan Standard Parts Co., Ltd., CSSC Haiwei High-Tech Co., Ltd., Hunan Shenyi Precision
Components Co., Ltd., China Railway Major Bridge Engineering Group Material Co., Ltd., MCC Testing and Certification Co., Ltd., Suzhou Thermal Engineering Research Institute Co., Ltd.
Ningbo Qunli Fastener Manufacturing Co., Ltd., Ningbo Zhenhai Jinli High Strength Fastener Co., Ltd., Ningbo Dazhi Machinery Technology Co., Ltd.
Co., Ltd., Jiangsu Yongyi Fastener Co., Ltd., Ningbo Zhongji Machinery Parts Inspection Co., Ltd., Hebei Zhongji Inspection Technology Co., Ltd.,
Ningbo Hisense Fastener Co., Ltd., Hunan Shenyi Machinery Application Research Institute Co., Ltd., Anhui Changjiang Fastener Co., Ltd., Zhejiang Hai
Co., Ltd., Hebei Wuwei Avionics Technology Co., Ltd., Ningbo Qingli Fastener Co., Ltd., Guangxi Liancheng Construction Group Co., Ltd.
Company, Handan Zhengfa Technology Co., Ltd., Hebei Bentler Fastener Manufacturing Co., Ltd., Zhejiang Dongming Stainless Steel Products Co., Ltd.,
Handan Deli Standard Parts Co., Ltd., Nanjing Fubel Hardware Products Co., Ltd., Hebei Jinan Fastener Co., Ltd., Hebei Xinde
Run Fastener Technology Co., Ltd., Hangzhou Huajia Standard Parts Co., Ltd., Hebei Tongfa Railway Engineering Group Minghao High-speed Railway Equipment Manufacturing Co., Ltd.
Company, Hangzhou Jiaxiang High Strength Bolt Co., Ltd.
This document is interpreted by the National Technical Committee on Fastener Standardization.
The previous versions of this document and the documents it replaces are as follows.
---First published as GB/T 1231-1976 in 1976, first revised in 1984, second revised in.1991, third revised in.2006
revision;
--- This is the fourth revision, incorporating GB/T 1228-2006 "High-strength large hexagon head bolts for steel structures" (GB/T 1228-
The previous versions of.2006 are. GB 1228-1976, GB 1228-1984, GB/T 1228-1991),
GB/T 1229-2006 "High-strength large hexagon nuts for steel structures" (GB/T 1229-2006 previous versions
GB 1229-1976, GB 1229-1984, GB/T 1229-1991) and GB/T 1230-2006 "High Strength Steel Structures"
The previous versions of GB/T 1230-2006 are. GB 1230-1976, GB 1230-1984,
GB/T 1230-1991).
High strength large hexagonal bolt connection for steel structure
1 Scope
This document specifies the types, dimensions, and technical requirements of high-strength large hexagonal bolt connections (hereinafter referred to as "bolt connections") for steel structures.
Requirements, test methods, inspection rules and marking, logo, label, packaging and quality inspection report.
This document is applicable to railway and highway bridges, tower mast structures, boiler steel structures, industrial and civil buildings, lifting machinery and other steel structures.
Wiping type high strength bolt connection pair.
2 Normative references
The contents of the following documents constitute essential clauses of this document through normative references in this document.
For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to this document.
document.
GB/T 2 Fastener external thread parts end
GB/T 90.1 Fastener acceptance inspection
GB/T 196 Basic dimensions of common threads
GB/T 197 General thread tolerances
GB/T 228.1 Tensile test of metallic materials Part 1.Room temperature test method
GB/T 229 Charpy pendulum impact test method for metallic materials
GB/T 230.1 Rockwell hardness test for metallic materials Part 1.Test method
GB/T 699 High-quality carbon structural steel
GB/T 1237 Fastener marking method
GB/T 3077 Alloy structural steel
GB/T 3098.1 Mechanical properties of fasteners Bolts, screws and studs
GB/T 3098.2 Mechanical properties of fasteners - Nuts
GB/T 3103.1 Fastener tolerances Bolts, screws, studs and nuts
GB/T 3103.3 Fastener tolerances Flat washers
GB/T 4340.1 Vickers hardness test for metallic materials Part 1.Test method
GB/T 5276 Fasteners Bolts, Screws, Studs and Nuts Size Codes and Markings
GB/T 5277 Fasteners Bolts and Screws Through Holes
GB/T 5779.1 Fastener surface defects - General requirements for bolts, screws and studs
GB/T 5779.2 Fasteners Surface Defect Nuts
GB/T 6478 Steels for cold heading and cold extrusion
JJG707 Torque Wrench Verification Procedure
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