HG/T 20634-2009 in English

1. Scope
This standard specifies the type, dimension, material, labeling, technical requirements and application of bolting for steel pipe flanges (C1ass designated).
This standard is applicable to the bolting for steel pipe flanges (including: hexagon head bolt, full thread bolt and screw nut) specified in HG/T 20615, HG/T 20623.
2. Normative references
The following standards contain provisions which, through reference in this text, constitute provisions of this national standard. For dated reference, subsequent amendments (excluding amending error in the text) to, or revisions of, any of these publications do not apply. However, parties to agreement based on this standard are encouraged to research whether the latest editions of these references are applied or not. For undated references, the latest edition of the normative document is applicable to this national standard.
"Fasteners-Ends of Parts with External Thread" GB/T 2
"Fasteners--Acceptance Inspection" GB/T 90.1
"Fasteners--Marking and Packaging” GB/T 90.2
"General Purpose Metric Screw Threads—Basic Dimensions " GB/T 196
"General Purpose Metric Screw Threads—Tolerance" GB/T 197
"Double End Studs (clamping type)-Product Grade B” GB/T 901
"Stainless Steel Bars" GB/T 1220
"Alloy Constructional Steel" GB/T 3077
"Mechanical Properties of Fasteners-Bolts, Screws and Studs" GB/T 3098.1
"Mechanical Properties of Fasteners—Nuts—Coarse Thread" GB/T 3098.2
"Mechanical Properties of Fasteners-Stainless Steel Bolts, Screws and Studs" GB/T 3098.6
"Mechanical Properties of Fasteners—Stainless Steel Screw Nuts” GB/T 3098.15
"Tolerances for Fasteners-Bolts, Screws, Studs and Screw Nuts” GB/T 3103.1
"Laminated Rods" GB/T 5133—1985
"Hexagon Head Bolt" GB/T 5782
"I-type Hexagon Nuts” GB/T 6170
"Fasteners-Surface Discontinuities-Bolts, Screws and Studs for General Requirements" GB/T 5779.1

1. Scope
2. Normative references
3. Types, Specification and Dimension of Bolting
3.1 Bolting Type
3.2 Hexagon Head Bolts
3.3 Full Thread Bolts
3.4 Screw Nuts
4. Materials
5. Usage of Bolting
6. Dimensional Tolerance
7. Surface Treatment
8. Inspection
9. Acceptance, Packaging and Quality Certificate
10. Labeling and Mark
Appendix A (Informative Appendix) Plain Washers for Pipe Flange Bolting
Appendix B (Informative Appendix) Bolting and Insulated Members for Insulated Flanges