GB/T 3098.5-2016 PDF English
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Mechanical properties of fasteners -- Tapping screws
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| GB/T 3098.5-2000 | English | 170 |
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Mechanical properties of fasteners - Tapping screws
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GB/T 3098.5-2016: PDF in English (GBT 3098.5-2016) GB/T 3098.5-2016
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 21.060.10
J 13
Replacing GB/T 3098.5-2000
Mechanical Properties of Fasteners – Tapping Screws
(ISO 2702.2011, Heat-Treated Steel Tapping Screws – Mechanical Properties,
MOD)
ISSUED ON. FEBRUARY 24, 2016
IMPLEMENTED ON. JUNE 1, 2016
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 6
2 Normative References ... 6
3 Materials ... 6
4 Technical Requirements ... 6
5 Acceptance ... 8
6 Test Methods ... 8
Foreword
GB/T 3098 Mechanical Properties of Fasteners include the following parts.
--- GB/T 3098.1 Mechanical Properties of Fasteners - Bolts, Screws and Studs;
--- GB/T 3098.2 Mechanical Properties of Fasteners - Nuts;
--- GB/T 3098.3 Mechanical Properties of Fasteners - Set Screws;
--- GB/T 3098.5 Mechanical Properties of Fasteners - Tapping Screws;
--- GB/T 3098.6 Mechanical Properties of Fasteners - Stainless Steel Bolts, Screws
and Studs;
--- GB/T 3098.7 Mechanical Properties of Fasteners - Thread Rolling Screws;
--- GB/T 3098.8 Mechanical Properties of Fasteners - Components for Bolted
Connections Made Mainly from Materials with a High Temperature Strength;
--- GB/T 3098.9 Mechanical Properties of Fasteners - Prevailing Torque Type Steel
Hexagon Nuts;
--- 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 - Drilling Screws with Taping
Screw Thread;
--- GB/T 3098.12 Mechanical Properties of Fasteners - Cone Proof Load Test on
Nuts;
--- GB/T 3098.13 Mechanical Properties of Fasteners - Torsional Test and Minimum
Torques for Bolts and Screws with Nominal Diameters 1mm to 10mm;
--- GB/T 3098.14 Mechanical Properties of Fasteners - Widening Test on Nuts;
--- GB/T 3098.15 Mechanical Properties of Fasteners - Nuts Made of Stainless-
Steel;
--- GB/T 3098.16 Mechanical Properties of Fasteners - Stainless Steel Set Screws;
--- GB/T 3098.17 Mechanical Properties of Fasteners - Preloading Test for the
Detection of Hydrogen Embrittlement - Parallel Bearing Surface Method;
--- GB/T 3098.18 Mechanical Properties of Fasteners - Blind Rivets Testing;
--- GB/T 3098.19 Mechanical Properties of Fasteners - Blind Rivets with Break Pull
Mandrel;
--- GB/T 3098.20 Mechanical Properties of Fasteners - Wing Nuts with Specified
Proof Torque;
--- GB/T 3098.21 Mechanical Properties of Fasteners - Stainless Steel Tapping
Screws;
--- GB/T 3098.22 Mechanical Properties of Fasteners - Made of the Fine Grain Non-
Heat Treatment Steel - Bolts, Screws and Studs.
This Part belongs to Part 5 of GB/T 3098.
This Part was drafted as per the rules specified in GB/T 1.1-2009.
This Part replaced GB/T 3098.5-2000 Mechanical Properties of Fasteners - Tapping
Screws; compared with GB/T 3098.5-2000, the major technical changes are as follows.
--- Increase Thread Specification ST 9.5 (Chapter 1);
--- Reduce the maximum hardness of the core from 390HV to 370HV (4.1.3);
--- Add “use the calibrated torque-measuring device according to provision of 3.2.2
in GB/T 3098.13” (6.2.2).
This Part adopts the re-drafting method to modify and use ISO 2702. 2011 Heat-
Treated Steel Tapping Screws – Mechanical Properties (English Edition).
The technical differences and causes between this Part and ISO 2702. 2011 are as
follows.
--- In the Normative References, use national standards to replace international
standards (Chapter 2); add the reference of GB/T 5280 (Chapter 1), so that
conform to basic China fastener standard.
This Part also makes the following editorial changes.
--- Modify the standard name;
--- Delete the bibliography of ISO 2702.
This Part was proposed by China Machinery Industry Federation.
This Part shall be under the jurisdiction of National Technical Committee for
Standardization of Fasteners (SAC/TC 85).
Drafting organization of this Part. China Productivity Center for Machinery.
Participating drafting organizations of this Part. Machinery Industry General Product
Mechanical Properties of Fasteners - Tapping Screws
1 Scope
This Part of GB/T 3098 specifies the materials, technical requirements and test
methods of tapping screws.
This Part is applicable to the tapping screws manufactured by carburizing carbon steel,
thread specification of ST2.2~ST9.5; and thread conforms to the provisions of GB/T
5280.
2 Normative References
The following documents are essential to the application of this document. For the
dated documents, only the versions with the dates indicated are applicable to this
document; for the undated documents, only the latest version (including all the
amendments) are applicable to this standard.
GB/T 3098.13-1996 Mechanical Properties of Fasteners - Torsional Test and
Minimum Torques for Bolts and Screws with Nominal Diameters 1mm to 10mm
(idt ISO 898-7.1992)
GB/T 4340.1 Metallic Materials - Vickers Hardness Test - Part 1. Test Method
(GB/T 4340.1-2009, ISO 6507-1.2005, MOD)
GB/T 5280 Tapping Screws Thread (GB/T 5280-2002, idt ISO 1478.1999)
3 Materials
The tapping screws shall be manufactured by the cold heading and carburizing carbon
steel.
4 Technical Requirements
4.1 Metallic phase
4.1.1 Surface hardness
The surface hardness of tapping screws after heat treatment shall be ≥450HV0.3 (see
5 Acceptance
The conventional acceptance test can only include screw-in performance, breakaway
torque and core hardness test; however, for the arbitration, all technical requirements
specified in Chapter 4 shall be met.
6 Test Methods
6.1 Metallic phase test
6.1.1 Surface hardness test
The Vickers-hardness test shall conform to the provisions of GB/T 4340.1.
The surface hardness test shall be performed on the plane, and preferentially on the
head of the tapping screw.
6.1.2 Carburized layer depth – metallic phase method
The carburized layer depth test shall be performed on the side of the thread, the
measuring point shall be at the 1/2 distance between tooth top and tooth bottom. For
the tapping screw with thread specification≤ST3.9, it shall be measured on the tooth
bottom.
The arbitration test shall be performed on the thread profile by the test force with
micro Vickers hardness of 300g. The carburized layer depth shall be calculated since
the point with core hardness of 30 HV.
6.1.3 Core Hardness test
The core hardness test shall conform to the provisions of GB/T 4340.1, and perform
on the 1/2 cross section of the sufficient distance (with complete minor diameter of
thread) away from the tapping screw end.
6.1.4 Microstructure test
The microstructure test shall be performed as per the metallic phase test standard.
6.2 Mechanical property test
6.2.1 Screw-in property test
Screw-in the tapping screw specimen (during acceptance period, with or without
coatings) into the test plate, till a complete thread totally passes through the test
plate.
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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