GB/T 9125.2-2020 PDF English
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Fasteners for steel pipe flange joints - Part 2: Class designated
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GB/T 9125.2-2020: Fasteners for steel pipe flange joints - Part 2: Class designated---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT9125.2-2020
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 23.040.60
J 15
Replacing GB/T 9125-2010
Fasteners for steel pipe flange joints - Part 2: Class
designated
ISSUED ON: JULY 21, 2020
IMPLEMENTED ON: FEBRUARY 01, 2021
Issued by: State Administration for Market Regulation;
Standardization Administration of the People's Republic of China.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Structural types, dimensions and tolerances ... 6
3.1 Hexagon head bolts ... 6
3.2 Full-thread stud ... 8
3.3 Hexagonal nut ... 8
3.4 Tolerances ... 11
3.5 Length and mass ... 12
4 Materials ... 12
4.1 General ... 12
4.2 Technical requirements ... 13
5 Manufacturing and heat treatment ... 15
5.1 Manufacturing ... 15
5.2 Heat treatment ... 16
6 Inspection and acceptance ... 17
6.1 Inspection ... 17
6.2 Acceptance ... 18
7 Product quality certificate ... 18
8 Marks and signs ... 18
9 Protection and packaging ... 20
Annex A (informative) Length and mass of fasteners ... 21
Annex B (informative) Calculation of fastener length ... 47
Annex C (informative) Strength classification of fastener materials ... 51
Bibliography ... 52
Foreword
GB/T 9125 "Fasteners for steel pipe flange joints" is divided into two parts:
- Part 1: PN designated;
- Part 2: Class designated.
This is Part 2 of GB/T 9125.
This Part was drafted in accordance with the rules given in GB/T 1.1-2009.
This Part replaces part of GB/T 9125-2010 "Fasteners for pipe flange joints". Compared
with GB/T 9125-2010, the main technical changes are as follows:
- Modified the scope statement (see Chapter 1 of this Edition; Chapter 1 of Edition
2010);
- Supplemented and improved the normative references (see Chapter 2 of this
Edition; Chapter 2 of Edition 2010);
- Added the specifications of bolts and studs (see Table 1, Table 2 of this Edition);
- Deleted the content of equal length studs (see 3.2 of Edition 2010);
- Deleted the performance grades A2-80 and A4-80 of hexagonal head bolts and
equal-length studs (see Table 1 and Table 2 of Edition 2010);
- Added material designations for full-thread studs and nuts (see Table 2 and Table 4
of this Edition);
- Added the requirements for fastener tolerances (see 3.4 of this Edition);
- Added length and mass of fasteners (see 3.5 of this Edition);
- Added manufacturing and heat treatment (see Chapter 5 of this Edition);
- Modified the provisions on surface treatment of fasteners (see 5.1.6 of this Edition;
Chapter 5 of Edition 2010);
- Modified the provisions on inspection and testing (see Chapter 6 of this Edition;
Chapter 6 and Chapter 7 of Edition 2010);
- Added Annex A "Length and mass of fasteners" (see Annex A of this Edition);
- Modified the contents of Class designated in the Annex A of Edition 2010 into
Annex B (see Annex B of this Edition; Annex A of Edition 2010);
Fasteners for steel pipe flange joints - Part 2: Class
designated
1 Scope
This Part of GB/T 9125 specifies the structural types, dimensions and tolerances,
materials, manufacturing and heat treatment, inspection and acceptance, product quality
certificates, marks and signs, protection and packaging requirements for Class
designated fasteners for steel pipe flange joints.
This Part applies to fasteners for steel pipe flange connections (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 rod
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
nominal length meets the smaller value of the following items a) and b), their unmarked
dimensional tolerances and geometric tolerances shall comply with the provisions for
Class B products in GB/T 3103.1:
a) greater than 10 d;
b) greater than 150 mm.
3.4.3 The dimensional tolerance and geometric tolerance of nuts with thread size less
than or equal to M16 shall comply with the provisions for Class A products in GB/T
3103.1. The dimensional tolerance and geometric tolerance of nuts with thread size
greater than M16 shall comply with the provisions for Class B products in GB/T 3103.1.
3.4.4 The thread tolerance of bolts and studs shall comply with 6 g of GB/T 197. The
thread tolerance of nuts shall comply with 6H of GB/T 197.
3.4.5 Unspecified fastener tolerances shall comply with the requirements of GB/T
3103.1.
3.5 Length and mass
3.5.1 For the length and mass of fasteners, refer to Annex A.
3.5.2 For the calculation of fastener length, refer to Annex B.
4 Materials
4.1 General
4.1.1 Fastener raw materials shall have quality certificates. Chemical composition
analysis shall be conducted. For fastener raw materials with the same steel grade, the
same smelting furnace number, the same cross-sectional dimensions, and the same heat
treatment conditions, the sampling quantity shall be 1% of each batch and shall not be
less than 1 piece.
4.1.2 The blank after heat treatment or strain hardening shall be subjected to mechanical
property analysis and shall meet the following requirements:
a) The blanks of same steel grade, same smelting furnace number, same section size,
same heat treatment conditions and manufactured in the same period constitute a
batch. The number of random inspections for each batch shall be 1 piece.
b) The sampling direction of the specimen shall be longitudinal. When the diameter
of the blank is less than or equal to 40 mm, the longitudinal axis of the specimen
shall be located at the center of the blank. When the diameter of the blank is
6.1.6 The non-destructive testing and qualified level of fasteners shall comply with the
requirements of the contract or relevant standards.
6.2 Acceptance
The acceptance of fasteners shall comply with the provisions of GB/T 90.1.
7 Product quality certificate
7.1 Each batch of fasteners produced in accordance with this Part shall be accompanied
by a product quality certificate.
7.2 The product quality certificate shall include the following contents:
a) Manufacturer name and date of manufacture;
b) Official seal of the manufacturer’s technical (quality) inspection department;
c) Signature of the quality inspector and inspection date;
d) Product name, specification, material designation and material standard or
performance grade;
e) Chemical composition and mechanical properties;
f) Other inspection reports specified in the contract.
8 Marks and signs
8.1 The marks of fasteners shall comply with the following provisions:
a) Product name;
b) Reference to this Part: GB/T 9125.2;
c) Thread size and nominal length, no length marking for nuts;
d) Material designation or performance level;
e) Nut type code.
Example 1:
The mark of a hexagonal head bolt with thread size M20, nominal length 100 mm and
performance grade 8.8 is: Hexagonal head bolt GB/T 9125.2 M20×100 8.8.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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