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Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be consulted authority.
This standard is developed in accordance with the rules given in GB/T 1.1-2009.
This standard replaces GB/T 16939-1997 High strength bolts for joints of space grid structures, and the following main technical changes have been made with respect to GB/T 16939-1997:
——Thread standards cited have been unified as GB/T 193 and GB/T 9145 (see Clause 2);
——Bolt specifications for M22, M33 and M52 have been deleted;
——Bolt specifications for M68×4, M72×4, M76×4, M80×4 and M85×4 have been added;
——35VB steel and Annex B have been deleted;
——42CrMo steel has been added.
This standard was proposed by China Machinery Industry Federation.
This Standard is under the jurisdiction of National Technical Committee on Fasteners of Standardization Administration of China (SAC/TC 85).
The Secretariat of the National Technical Committee on Fasteners of Standardization Administration of China is in charge of the explanation of this standard.
The previous edition of this standard is as follows:
——GB/T 16939-1997
High strength bolts for joints of space grid structures
1 Scope
This standard specifies the types, dimensions, technical conditions, designation, mechanical properties, test method, acceptance rules, marking and packaging of high strength bolts for joints of space grid structures.
This standard is applicable to high strength bolts for joints of space grid structures with the thread specification of M12~M85×4.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition (including any amendments) applies.
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 193 General purpose metric screw threads - General plan
GB/T 228.1 Metallic materials - Tensile testing - Part 1 : Method of test at room temperature
GB/T 230.1 Metallic materials - Rockwell hardness test - Part 1: Test method (Scales A, B, C, D, E, F, G, H, K, N, T)
GB/T 699 Quality carbon structure steels
GB/T 700 Carbon structural steels
GB/T 1237 Designation system for fasteners
GB/T 1591 High strength low alloy structural steels
GB/T 3077 Alloy structure steels
GB/T 3098.1 Mechanical properties of fasteners - Blots, screws and studs
GB/T 3103.1 Tolerances for fasteners - Bolts, screws, studs and nuts
GB/T 5779.1 Surface discontinuities of fasteners on bolts, screws and studs for general requirements
GB/T 9145 General purpose metric screw threads - Limits of sizes for the screw threads of medium quality and preferable plan
3 Dimensions
For types and dimensions of bolts, see Figure 1 and Table 1.
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1 Scope
2 Normative references
3 Dimensions
4 Technical conditions and referenced standards
5 Designation
6 Mechanical properties
7 Test methods
8 Acceptance rules
9 Marking and packaging
Annex A (Informative) Bottom thickness of sockets, and sealing plates or conical heads
