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GB/T 3098.5-2016 English PDF (GBT3098.5-2016)

GB/T 3098.5-2016 English PDF (GBT3098.5-2016)

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GB/T 3098.5-2016: Mechanical properties of fasteners -- Tapping screws

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.
GB/T 3098.5-2016
GB
NATIONAL STANDARD OF THE
PEOPLE 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.

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