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Basic data
| Standard ID | GB/T 3098.5-2025 (GB/T3098.5-2025) |
| Description (Translated English) | Mechanical properties of fasteners - Part 5: Tapping screws |
| Sector / Industry | National Standard (Recommended) |
| Classification of Chinese Standard | J13 |
| Classification of International Standard | 21.060.10 |
| Word Count Estimation | 16,155 |
| Date of Issue | 2025-10-31 |
| Date of Implementation | 2026-02-01 |
| Older Standard (superseded by this standard) | GB/T 3098.5-2016 |
| Issuing agency(ies) | State Administration for Market Regulation, Standardization Administration of China |
GB/T 3098.5-2025: Mechanical properties of fasteners - Part 5: Tapping screws
---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
ICS 21.060.10
CCSJ13
National Standards of the People's Republic of China
Replaces GB/T 3098.5-2016
Fastener Mechanical Properties Part 5.Self-Tapping Screws
physicalproperties, MOD)
Published on 2025-10-31
Implemented on February 1, 2026
State Administration for Market Regulation
The State Administration for Standardization issued a statement.
Table of contents
Preface III
Introduction V
1.Scope 1
2 Normative References 1
3.Terms and Definitions 1
4.Materials 1
5.Mechanical and physical properties 1
6.Test Methods 3
7.Check 7
8.Signs and Labels
References 9
Foreword
This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1.Structure and Drafting Rules of Standardization Documents".
Drafting.
This document is Part 5 of GB/T 3098 "Mechanical Properties of Fasteners". GB/T 3098 has already published the following parts.
---GB/T 3098.1 Mechanical properties of fasteners. bolts, screws and studs;
---GB/T 3098.2 Mechanical properties of fasteners – Part 2.Nuts;
---GB/T 3098.3 Mechanical properties of fasteners - Set screws;
---GB/T 3098.5 Mechanical properties of fasteners—Part 5.Self-tapping screws;
---GB/T 3098.6 Mechanical properties of fasteners - Stainless steel bolts, screws and studs;
---GB/T 3098.7 Mechanical Properties of Fasteners - Self-Extruding Screws;
---GB/T 3098.8 Mechanical properties of fasteners - Bolted connections for use at -200℃~700℃;
---GB/T 3098.9 Mechanical Properties of Fasteners - Effective Torque Type Steel Locknuts;
---GB/T 3098.10 Mechanical properties of fasteners – Bolts, screws, studs and nuts made of non-ferrous metals;
---GB/T 3098.11 Mechanical Properties of Fasteners - Self-Drilling and Self-Tapping Screws;
---GB/T 3098.12 Mechanical properties of fasteners - Tapered proof load test for nuts;
---GB/T 3098.13 Mechanical properties of fasteners - Torque test and breaking torque of bolts and screws (nominal diameter 1~10mm);
---GB/T 3098.14 Mechanical properties of fasteners - Nut hole expansion test;
---GB/T 3098.15 Mechanical Properties of Fasteners - Stainless Steel Nuts;
---GB/T 3098.16 Mechanical properties of fasteners - Stainless steel set screws;
---GB/T 3098.17 Preload test for hydrogen embrittlement of fasteners—parallel bearing surface method;
---GB/T 3098.18 Test methods for mechanical properties of fasteners, specifically blind rivets;
---GB/T 3098.19 Mechanical Properties of Fasteners - Blind Rivets;
---GB/T 3098.20 Mechanical properties of fasteners - Guaranteed torque for wing nuts;
---GB/T 3098.21 Mechanical Properties of Fasteners - Stainless Steel Self-Tapping Screws;
---GB/T 3098.22 Mechanical properties of fasteners - Fine-grained non-quenched and tempered steel bolts, screws and studs;
---GB/T 3098.23 Mechanical properties of fasteners M42~M72 bolts, screws and studs;
---GB/T 3098.24 Mechanical properties of fasteners - Stainless steel and nickel alloy bolts, screws, studs and nuts for high temperature applications;
---GB/T 3098.25 Mechanical Properties of Fasteners - Guidelines for the Selection of Stainless Steel and Nickel Alloy Fasteners;
---GB/T 3098.26 Mechanical properties of fasteners - flat washers.
This document replaces GB/T 3098.5-2016 "Fasteners - Mechanical Properties - Self-Tapping Screws". Compared with GB/T 3098.5-2016, it includes the following changes.
Aside from structural adjustments and editorial changes, the main technical changes are as follows.
a) Mechanical and physical properties and related test methods have been added (see Table 1);
b) The maximum carburized layer depth for ST2.2 and ST2.6 has been changed from 0.10 mm to 0.12 mm (see 5.3, 4.1.2 of the.2016 edition);
c) The maximum core hardness has been changed from 370 HV to 390 HV, and the core hardness test is specified in detail (see 5.4 and 6.4,.2016 edition).
(4.1.3 and 6.1.3)
d) Added ductility and stretchability tests (see 5.8 and 6.8);
e) The test method for determining the carburized layer depth has been modified (see 6.3, 6.1.2 of the.2016 version);
f) The torque test method has been changed (see 6.7);
g) Acceptance requirements have been added (see Chapter 7);
h) Added requirements for signage and labeling (see Chapter 8).
This document is modified to adopt ISO 2702.2022 "Fasteners - Heat-treated self-tapping screws - Mechanical and physical properties".
The technical differences between this document and ISO 2702.2022, and the reasons therefor, are as follows.
---ISO 1478 has been replaced with the normatively referenced GB/T 5280 to adapt to my country's technical requirements (see 3.1 and 6.4);
---ISO 6507-1 has been replaced with the normatively referenced GB/T 4340.1 to adapt to my country's technical requirements (see Chapter 6);
---ISO 16228 has been replaced with the normatively referenced GB/T 39310 to adapt to my country's technical requirements (see 7.4);
---ISO 1891-4 has been replaced with the normatively referenced GB/T 3099.4 to adapt to my country's technical conditions (see 8.3).
The following editorial changes have been made to this document.
---The standard title has been changed to "Mechanical Properties of Fasteners Part 5.Self-Tapping Screws";
---Use GB/T 6478 and GB/T 90.3, which are cited in reference material, instead of ISO 4954 and ISO 16426.
Please note that some content in this document may involve patents. The issuing organization of this document assumes no responsibility for identifying patents.
This document was proposed by the China Machinery Industry Federation.
This document is under the jurisdiction of the National Fastener Standardization Technical Committee (SAC/TC85).
This document was drafted by. China Machinery Productivity Promotion Center Co., Ltd., Zhejiang Mengshi Technology Co., Ltd., and Zhejiang Xinshengda Metal Technology Co., Ltd.
Technology Development Co., Ltd., Shenzhen Aviation Standard Parts Co., Ltd., Zhejiang Tiankai Industrial Co., Ltd., Zhejiang Yutai Auto Parts Co., Ltd.
Geely Automobile Research Institute (Ningbo) Co., Ltd., Zhejiang Guojian Testing Technology Co., Ltd., Zhejiang Keteng Precision Machinery Co., Ltd.
Ningbo Zhongji Mechanical Parts Testing Co., Ltd., Ningbo Xuebote Fasteners Co., Ltd., Hebei Zhanyu Electromechanical Technology Co., Ltd., Ningbo Min
Da Auto Technology Co., Ltd., and Liaoning Zhongke Lile Testing Technology Service Co., Ltd.
This document is subject to interpretation by the National Fastener Standardization Technical Committee.
The release history of this document and the document it replaces is as follows.
This document was first published in 1985, first revised in.2000, and second revised in.2016;
---This is the third revision.
Introduction
GB/T 3098 "Mechanical Properties of Fasteners" specifies the mechanical properties for different categories of fasteners, providing guidance for fastener design and manufacturing.
It provides a basis for construction, acceptance inspection and use, and is proposed to consist of 28 parts.
---GB/T 3098.1 Mechanical properties of fasteners. bolts, screws and studs;
---GB/T 3098.2 Mechanical properties of fasteners – Part 2.Nuts;
---GB/T 3098.3 Mechanical properties of fasteners - Set screws;
---GB/T 3098.5 Mechanical properties of fasteners—Part 5.Self-tapping screws;
---GB/T 3098.6 Mechanical properties of fasteners - Stainless steel bolts, screws and studs;
---GB/T 3098.7 Mechanical Properties of Fasteners - Self-Extruding Screws;
---GB/T 3098.8 Mechanical properties of fasteners - Bolted connections for use at -200℃~700℃;
---GB/T 3098.9 Mechanical Properties of Fasteners - Effective Torque Type Steel Locknuts;
---GB/T 3098.10 Mechanical properties of fasteners – Bolts, screws, studs and nuts made of non-ferrous metals;
---GB/T 3098.11 Mechanical Properties of Fasteners - Self-Drilling and Self-Tapping Screws;
---GB/T 3098.12 Mechanical properties of fasteners - Tapered proof load test for nuts;
---GB/T 3098.13 Mechanical properties of fasteners - Torque test and breaking torque of bolts and screws (nominal diameter 1~10mm);
---GB/T 3098.14 Mechanical properties of fasteners - Nut hole expansion test;
---GB/T 3098.15 Mechanical Properties of Fasteners - Stainless Steel Nuts;
---GB/T 3098.16 Mechanical properties of fasteners - Stainless steel set screws;
---GB/T 3098.17 Preload test for hydrogen embrittlement of fasteners—parallel bearing surface method;
---GB/T 3098.18 Test methods for mechanical properties of fasteners, specifically blind rivets;
---GB/T 3098.19 Mechanical Properties of Fasteners - Blind Rivets;
---GB/T 3098.20 Mechanical properties of fasteners - Guaranteed torque for wing nuts;
---GB/T 3098.21 Mechanical Properties of Fasteners - Stainless Steel Self-Tapping Screws;
---GB/T 3098.22 Mechanical properties of fasteners - Fine-grained non-quenched and tempered steel bolts, screws and studs;
---GB/T 3098.23 Mechanical properties of fasteners M42~M72 bolts, screws and studs;
---GB/T 3098.24 Mechanical properties of fasteners - Stainless steel and nickel alloy bolts, screws, studs and nuts for high temperature applications;
---GB/T 3098.25 Mechanical Properties of Fasteners - Guidelines for the Selection of Stainless Steel and Nickel Alloy Fasteners;
---GB/T 3098.26 Mechanical Properties of Fasteners - Flat Washers;
---GB/T 3098.27 Mechanical properties of fasteners—Part 27.Stainless steel flat washers;
---GB/T 3098.28 Mechanical properties of fasteners - Part 28.M42~M100 nuts.
GB/T 3098 has been converted to ISO 898 series of mechanical properties of carbon steel and alloy steel fasteners and ISO 3506 series of mechanical properties of stainless steel fasteners.
Performance, and mechanical properties of self-tapping screws, self-extruding screws, effective torque steel lock nuts, non-ferrous metal fasteners, self-drilling self-tapping screws, etc.
International standards; independently formulated mechanical performance standards for blind rivets, fine-grained non-quenched and tempered steel fasteners, and M42~M72 external thread fasteners; incorporated into
The test methods include. nut hole enlargement test, preload test for hydrogen embrittlement using the parallel bearing surface method, blind rivet test method, and guaranteed torque test for wing nuts.
Legal standards. The standards for the mechanical properties of various materials and types of products, along with related testing methods, are incorporated into the GB/T 3098 series.
For use.
Self-tapping screw connections use self-tapping screws to tap matching internal threads into the pilot holes of the connected parts, without deforming the screw's own threads.
Non-load-bearing structures are connected using fasteners. During the tapping and tightening process, the screw and the inner hole form an interference fit, which is superior to bolting and riveting.
The fastening method is simpler and more efficient.
Fastener Mechanical Properties Part 5.Self-Tapping Screws
1 Scope
This document specifies the material, mechanical, and physical properties, and test methods for self-tapping screws when tested under ambient temperatures ranging from 10℃ to 35℃.
Requirements such as laws, inspections, markings, and labels.
This document applies to self-tapping screws made of carburized steel with thread specifications of ST2.2~ST9.5 and threads conforming to GB/T 5280.
Screw.
Self-tapping screws are used to create mating threads in metal sheets without deforming their own threads. Self-tapping screws are not used to bear preload.
Moreover, it can withstand low levels of tensile stress even after installation.
2 Normative references
The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included.
For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies.
This document.
GB/T 3099.4 Fastener Terminology – Control, Inspection, Delivery, Acceptance and Quality (GB/T 3099.4-2021, ISO 1891-4)
2018, MOD)
GB/T 4340.1 Metallic materials – Vickers hardness test – Part 1.Test methods (GB/T 4340.1-2024, ISO 6507-
1.2023, MOD)
GB/T 5280 Threads for self-tapping screws (GB/T 5280-2002, idtISO 1478.1999)
GB/T 39310 Fastener Inspection Document Types (GB/T 39310-2020, ISO 16228.2017, MOD)
3 Terms and Definitions
The following terms and definitions apply to this document.
3.1
self-tapping screwscrew
sheetmetal screw
Screws with threads conforming to GB/T 5280, when screwed into the pilot hole, form a mating contact with the material of the clamped part (usually a thin metal sheet).
The thread, without deforming its own thread.
4.Materials
Self-tapping screws should be made of cold-heading steel that can be surface-carburized (e.g., GB/T 6478, ISO 4954, EN10263-3, ASME).
B18.6.3, JISG3507).
5.Mechanical and physical properties
5.1 General Requirements
Whether during the manufacturing process or during final product inspection, the methods specified in Chapter 6 shall be followed under ambient temperatures ranging from 10°C to 35°C.
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