1 Scope
This part of GB/T 9125 specifies the structural style, dimension and tolerance, material, manufacturing and heat treatment, inspection and acceptance, product quality certificate, marking and labeling, protection and packaging requirements of fasteners for class designated steel pipe flange joints.
This part is applicable to fasteners for steel pipe flange joints (including hexagon head bolts, full-thread studs and nuts) specified in GB/T 9124.2 and GB/T 13402.
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 of the referenced document (including any amendments) applies.
GB/T 2 Fasteners - Ends of parts with external thread
GB/T 90.1 Fasteners - Acceptance inspection
GB/T 196 General purpose metric screw threads - Basic dimensions
GB/T 197 General purpose metric screw threads - Tolerances
GB/T 228.1 Metallic materials - Tensile testing - Part 1: Method of test at room temperature
GB/T 699 Quality carbon structure steels
GB/T 700 Carbon structural steels
GB/T 1220 Stainless steel bars
GB/T 1221 Heat-resistant steel bars
GB/T 3077 Alloy structure steels
GB/T 3098.1 Mechanical properties of fasteners - Bolts, screws and studs
GB/T 3098.2 Mechanical properties of fasteners - Nuts
GB/T 3098.6 Mechanical properties of fasteners - Stainless steel bolts, screws and studs
GB/T 3098.15 Mechanical properties of fasteners - Stainless steel nuts
GB/T 3103.1 Tolerances for fasteners - Bolts, screws, studs and nuts
GB/T 5276 Fasteners - bolts, screws, studs and nuts - Symbols and designations of dimensions
GB/T 5779.1 Surface discontinuities of fasteners on bolts, screws and studs for general requirements
GB/T 5779.2 Fasteners - Surface discontinuities - Nuts
GB/T 5782 Hexagon head bolts
GB/T 5785 Hexagon head bolts - Fine pitch thread
3 Structural style, dimension and tolerance
3.1 Hexagon head bolt
3.1.1 The structural style of hexagon head bolt is detailed in Figure 1, and dimension codes and markings shall meet the requirements of GB/T 5276.
Foreword II
1 Scope
2 Normative references
3 Structural style, dimension and tolerance
3.1 Hexagon head bolt
3.2 Full-thread stud
3.3 Hexagon nut
3.4 Tolerance
3.5 Length and mass
4 Materials
4.1 General requirements
4.2 Technical requirements
5 Manufacturing and heat treatment
5.1 Manufacturing
5.2 Heat treatment
6 Inspection and acceptance
6.1 Inspection
6.2 Acceptance
7 Product quality certificate
8 Marking and labeling
9 Protection and packaging
Annex A (Informative) Length and mass of fasteners
Annex B (Informative) Calculation of length of fasteners
Annex C (Informative) Classification of strength of fastener material
1 Scope
This part of GB/T 9125 specifies the structural style, dimension and tolerance, material, manufacturing and heat treatment, inspection and acceptance, product quality certificate, marking and labeling, protection and packaging requirements of fasteners for class designated steel pipe flange joints.
This part is applicable to fasteners for steel pipe flange joints (including hexagon head bolts, full-thread studs and nuts) specified in GB/T 9124.2 and GB/T 13402.
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 of the referenced document (including any amendments) applies.
GB/T 2 Fasteners - Ends of parts with external thread
GB/T 90.1 Fasteners - Acceptance inspection
GB/T 196 General purpose metric screw threads - Basic dimensions
GB/T 197 General purpose metric screw threads - Tolerances
GB/T 228.1 Metallic materials - Tensile testing - Part 1: Method of test at room temperature
GB/T 699 Quality carbon structure steels
GB/T 700 Carbon structural steels
GB/T 1220 Stainless steel bars
GB/T 1221 Heat-resistant steel bars
GB/T 3077 Alloy structure steels
GB/T 3098.1 Mechanical properties of fasteners - Bolts, screws and studs
GB/T 3098.2 Mechanical properties of fasteners - Nuts
GB/T 3098.6 Mechanical properties of fasteners - Stainless steel bolts, screws and studs
GB/T 3098.15 Mechanical properties of fasteners - Stainless steel nuts
GB/T 3103.1 Tolerances for fasteners - Bolts, screws, studs and nuts
GB/T 5276 Fasteners - bolts, screws, studs and nuts - Symbols and designations of dimensions
GB/T 5779.1 Surface discontinuities of fasteners on bolts, screws and studs for general requirements
GB/T 5779.2 Fasteners - Surface discontinuities - Nuts
GB/T 5782 Hexagon head bolts
GB/T 5785 Hexagon head bolts - Fine pitch thread
3 Structural style, dimension and tolerance
3.1 Hexagon head bolt
3.1.1 The structural style of hexagon head bolt is detailed in Figure 1, and dimension codes and markings shall meet the requirements of GB/T 5276.
Contents of GB/T 9125.2-2020
Foreword II
1 Scope
2 Normative references
3 Structural style, dimension and tolerance
3.1 Hexagon head bolt
3.2 Full-thread stud
3.3 Hexagon nut
3.4 Tolerance
3.5 Length and mass
4 Materials
4.1 General requirements
4.2 Technical requirements
5 Manufacturing and heat treatment
5.1 Manufacturing
5.2 Heat treatment
6 Inspection and acceptance
6.1 Inspection
6.2 Acceptance
7 Product quality certificate
8 Marking and labeling
9 Protection and packaging
Annex A (Informative) Length and mass of fasteners
Annex B (Informative) Calculation of length of fasteners
Annex C (Informative) Classification of strength of fastener material