GB/T 9125-2010 in English

《GB/T 9125-2010管法兰连接用紧固件》由TC237（全国管路附件标准化技术委员会）归口，主管部门为中国机械工业联合会。

1 Scope

This standard specifies technical requirements for types and dimensions, materials and mechanical properties, etc. of fasteners for pipe flange joints.
This standard is applicable to the fasteners for pipe flange joints of different materials such as steel flange, cast iron flange, copper alloy and composite flange.
Fasteners specified in this standard cover hexagon head bolts, stud bolts, full thread studs, hexagon nuts and large hexagon nuts.

2 Normative References

The following standards contain provisions which, through reference in this text, constitute provisions of this standard. For dated reference, subsequent amendments to (excluding correction to), or revisions of, any of these publications do not apply. However, all parties coming to an agreement according to this standard are encouraged to study whether the latest edition of these documents is applicable. For undated references, the latest edition of the normative document is applicable to this standard.
GB/T 2 "Fasteners - Ends of Parts with External Thread" (GB/T 2-2001, idt ISO 4753:1999)
GB/T 90.1 "Fasteners - Acceptance Inspection" (GB/T 90.1-2002, idt ISO 3269:2000)
GB/T 90.2 "Fasteners - Marking and Packaging"
GB/T 196 "General Purpose Metric Screw Threads-Basic Dimensions" (GB/T 196-2003, ISO 724:1993, MOD)
GB/T 197 "General Purpose Metric Screw Threads - Tolerances" (GB/T 197-2003, ISO 965-1:1998, MOD)
GB/T 699 "Quality Carbon Structural Steels"
GB/T 901 "Double End Studs (Clamping Type)-Product Grade B"
GB/T 1220 "Stainless Steel Bars"
GB/T 1229 "High Strength Large Hexagon Nuts for Steel Structures"
GB/T 1237 "Designation System for Fasteners" (GB/T 1237-2000, eqv ISO 8991:1986)
GB/T 3077 "Alloy Structure Steels"
GB/T 3098.1 "Mechanical Properties of Fasteners-Bolts, Screws and Studs" (GB/T 3098.1-2000, idt ISO 898-1:1999)
GB/T 3098.2 "Mechanical Properties of Fasteners-Nuts-Coarse Thread" (GB/T 3098.2-2000, idt ISO 898-2:1992)
GB/T 3098.6 "Mechanical Properties of Corrosion-resistant Stainless-steel Fasteners-Part 1: Bolts, Screws and Studs" (GB/T 3098.6-2000, idt ISO 3506-1:1997)
GB/T 3098.15 "Mechanical Properties of Fasteners-Nuts Made of Stainless-steel" (GB/T 3098.15-2000, idt ISO 3506-2:1997)
GB/T 5782 "Hexagon Head Bolts" (GB/T 5782-2000, eqv ISO 4014:1999)
GB/T 6170 "Hexagon Nuts, Style 1" (GB/T 6170-2000, eqv ISO 4032:1999)
JB/T 4730 "Nondestructive Testing of Pressure Equipments"

3 Types and Dimension, Property Grades and Material Designations

3.1 Hexagon head bolts
3.1.1 The types and dimensions of hexagon head bolts for pipe flange joints shall meet the requirements of GB/T 5782; the bolt end shall be rounded (as shown in Figure 1), and the rounding shall meet the requirements of GB/T 2.

Foreword I
1 Scope
2 Normative References
3 Types and Dimension, Property Grades and Material Designations
4 Material and Mechanical Properties of Fasteners
5 Surface Treatment
6 Test Methods
7 Acceptance Inspection
8 Marking and Packing
9 Designation
Appendix A (Informative) Calculation Method for the Length of Fasteners for Pipe Flange Joints
Appendix B (Informative) Operating Guide to Fasteners for Pipe Flange Joints