GB/T 9125.1-2020 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 9125.1-2020 | English | 1005 |
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Fasteners for steel pipe flange joints - Part 1: PN designated
| Valid |
| GB/T 9125-2010 | English | 719 |
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3 days
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Fasteners for pipe flange joints
| Obsolete |
| GB/T 9125-2003 | English | 639 |
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5 days
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Fasteners for pipe flange joints
| Obsolete |
| GB/T 9125-1988 | English | RFQ |
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Specification for steel pipe flanges
| Obsolete |
Excerpted PDFs (Download full copy in 9 seconds upon purchase)PDF Preview: GB/T 9125.1-2020
GB/T 9125.1-2020: Fasteners for steel pipe flange joints - Part 1: PN 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/GBT9125.1-2020
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 1.PN designated
Issued on. SEPTEMBER 29, 2020
Implemented on. APRIL 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 Equal-length studs... 8
3.3 Full-thread studs... 9
3.4 Hexagonal nuts... 9
3.5 Tolerance... 12
3.6 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... 15
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) Fastener length and mass... 21
Annex B (informative) Calculation of fastener length... 90
Annex C (informative) Strength classification of fastener materials... 94
Bibliography... 95
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 PN designated
fasteners for steel pipe flange joints.
This Part applies to fasteners for steel pipe flange joints specified in GB/T 9124.1
(including hexagon head bolts, equal-length studs, full-thread studs and nuts).
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
3 Structural types, dimensions and tolerances
3.1 Hexagon head bolts
3.1.1 The structural type of hexagon head bolts is shown in Figure 1.The size code and
marking shall comply with the requirements of GB/T 5276.
3.1.2 When the thread size of the hexagonal head bolt is less than or equal to M33, the
pitch shall be of the coarse pitch series. The dimensions shall comply with the
provisions of GB/T 5782.
3.2.1 The structural type of equal-length studs is shown in Figure 2.The size code and
marking shall comply with the provisions of GB/T 5276.
3.2.2 When the thread specification of equal-length studs is less than or equal to M33,
the pitch shall be of the coarse pitch series.
3.3 Full-thread studs
3.3.1 The structural type of the full-thread stud is shown in Figure 3.The size code and
marking shall comply with the provisions of GB/T 5276.
3.3.2 When the thread size of the full-thread stud is less than or equal to M33, the pitch
shall be coarse pitch series.
3.5 Tolerance
3.5.1 For bolts and studs with thread size less than or equal to M24 and nominal length
in accordance with the smaller value of the following items a) and b), their unmarked
dimensional tolerances and geometric tolerances shall comply with the provisions for
grade A products in GB/T 3103.1.
3.5.3 The dimensional tolerance and geometric tolerance of nuts with thread size less
than or equal to M16 shall comply with the provisions for grade A products in GB/T
3103.1.
3.6 Length and mass
3.6.1 For the length and mass of fasteners, refer to Annex A.
3.6.2 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 comply with the following requirements.
4.1.3 Fastener materials used at temperatures below or equal to -20°C shall be subjected
to low-temperature Charpy impact tests. The requirements for the impact tests shall
comply with the provisions of relevant standards.
4.2 Technical requirements
4.2.1 The materials and mechanical properties of hexagon head bolts and equal-length
studs shall comply with the requirements of GB/T 3098.1 or GB/T 3098.6.
4.2.4 The material and hardness of type 2 nuts shall comply with the requirements of
Table 7.
5 Manufacturing and heat treatment
5.1 Manufacturing
5.1.1 The basic dimensions of the thread shall comply with the requirements of GB/T
196.
5.1.2 The surface roughness of the thread flanks and roots of bolts and studs shall not
exceed Ra 3.2.The surface roughness of the thread flanks and roots of nuts shall not
exceed Ra 6.3.
5.1.3 The minimum height E of the un-decarburized layer of bolt and stud threads is 0.5
times the tooth profile height. The maximum depth of the fully decarburized layer is
0.015 mm. The decarburization test method shall be carried out in accordance with the
relevant provisions of GB/T 3098.1.
5.2 Heat treatment
5.2.1 The heat treatment requirements for hexagon head bolts or equal-length studs shall
comply with the requirements of GB/T 3098.1 or GB/T 3098.6.
5.2.2 The heat treatment requirements for full-thread studs shall comply with the
requirements in Table 8.
5.2.3 The heat treatment requirements for type 1 nuts shall comply with the
requirements of GB/T 3098.2 or GB/T 3098.15.
5.2.4 The heat treatment requirements for type 2 nuts shall comply with the
requirements in Table 9.
5.2.5 Raw materials supplied in accordance with the heat treatment process in Table 8
or Table 9 can be directly processed into products for delivery, provided that the
mechanical properties of the products are guaranteed.
6 Inspection and acceptance
6.1 Inspection
6.1.1 Inspection shall be conducted in batches. Products with the same material
designation, same smelting furnace number, same type, same thread specification, same
length (except nuts) and same production process shall be considered as a batch.
6.1.2 The inspection of dimensions shall comply with the requirements of GB/T 90.1.
6.1.3 The surface defects of bolts and studs shall comply with the provisions of GB/T
5779.1.
6.1.5 The outer surface of fasteners shall not have cutting burrs.
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.
8 Marks and signs
8.1 The marks of fasteners shall comply with the following provisions.
8.2 The ends of the studs, the top surface of the head of the hexagonal bolts and the
bearing surface or side surface of the nuts shall be marked by steel stamp or laser. The
marking shall be clearly visible.
8.3 The material code shall comply with the requirements of Table 10.
9 Protection and packaging
9.1 Products shall be rust-proof.
9.3 Fasteners shall be packed in sets.
9.4 The packing box shall contain a product packing list and a product quality certificate.
9.5 The product packing list shall include the following.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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