GB/T 3098.5-2016 English PDF (GB/T3098.5-2016)

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GB/T 3098.5-2016: Mechanical properties of fasteners -- Tapping screws
GB/T 3098.5-2016
Mechanical properties of fasteners.Tapping screws
ICS 21.060.10
J13
National Standards of People's Republic of China
Replacing GB/T 3098.5-2000
Mechanical properties of fasteners self-tapping screws
(ISO 2702.2011, Heat-treatedsteeltappingscrews-Mechanical
properties, MOD)
Issued on. 2016-02-24
2016-06-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Foreword
GB/T 3098 "Mechanical properties of fasteners" includes the following sections.
--- GB/T 3098.1 Mechanical properties of fasteners Bolts, screws and studs;
--- GB/T 3098.2 Mechanical properties of fasteners;
--- GB/T 3098.3 Mechanical properties of fasteners set screws;
--- GB/T 3098.5 Mechanical properties of fasteners 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 rolling screws;
--- GB/T 3098.8 Mechanical properties of fasteners bolted connections;
--- GB/T 3098.9 Mechanical properties of fasteners torque type steel hexagon nuts;
--- GB/T 3098.10 Mechanical properties of fasteners non-ferrous metal manufacturing bolts, screws, studs and nuts;
--- GB/T 3098.11 Mechanical properties of fasteners drilling tapping screws;
--- GB/T 3098.12 Mechanical properties of fasteners - Cone proof load test;
--- GB/T 3098.13 Mechanical properties of fasteners Bolts and screws with torque test and minimum torques nominal diameter 1 ~ 10mm;
--- GB/T 3098.14 Mechanical properties of fasteners reaming test;
--- GB/T 3098.15 mechanical properties of stainless steel fasteners nuts;
--- GB/T 3098.16 mechanical properties of stainless steel fasteners Set screws;
--- GB/T 3098.17 Mechanical properties of fasteners - Preloading test for 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 rivet;
--- GB/T 3098.20 Mechanical properties of fasteners wing nut torque assurance;
--- GB/T 3098.21 mechanical properties of stainless steel fasteners self-tapping screws;
--- GB/T 3098.22 fasteners mechanical properties of ultrafine grained non-quenched and tempered steel bolts, screws and studs.
This part of GB/T 53098 Part of.
This section drafted in accordance with GB/T 1.1-2009 given rules.
This Part replaces GB/T 3098.5-2000 "Mechanical properties of fasteners self-tapping screws," compared with the GB/T 3098.5-2000, the main
Technical changes are as follows.
--- Increasing the thread size ST9.5 (Chapter 1);
--- Core hardness reduced to the maximum by the 390HV 370HV (4.1.3);
--- Increase "according to GB/T 3098.13-1996 specified in 3.2.2, using a calibrated torque - measuring device" (6.2.2).
This section uses redrafted law revision using ISO 2702.2011 "heat-treated steel tapping screws and mechanical properties" (in English).
This part of ISO 2702.2011 technical differences and their reasons are as follows.
--- Normative reference document, instead of using our standards with international standards (Chapter 2), increase the reference GB/T 5280 (Chapter 1) to
In line with our basic standard fasteners.
This section also made the following editorial changes.
--- To modify the standard name;
--- Delete references ISO 2702.
This part is proposed by China Machinery Industry Federation.
This part of the National Standardization Technical Committee fasteners (SAC/TC85) centralized.
This section is responsible for drafting unit. Productivity Promotion Center in the machine.
Participated in the drafting of this section. General Mechanical Components industry products Quality Supervision and Testing Center, Zhejiang CIQ Detection Technology Limited.
This standard by the National Standardization Technical Committee Secretariat responsible for the interpretation of fasteners.
This standard replaces the standards previously issued as follows.
--- GB/T 3098.5-1985, GB/T 3098.5-2000.
Mechanical properties of fasteners self-tapping screws
1 Scope
GB/T 3098 provisions of this part of the material, technical requirements and test methods for self-tapping screws.
This section applies to the manufacture of hardened steel, thread specifications for ST2.2 ~ ST9.5, tapping screw thread according to GB/T 5280 regulations.
2 Normative references
The following documents for the application of this document is essential. For dated references, only the dated version suitable for use herein
Member. For undated references, the latest edition (including any amendments) applies to this document.
GB/T 3098.13-1996 Mechanical properties of fasteners Bolts and screws with torque test and minimum torques nominal diameter 1 ~ 10mm
(IdtISO 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 with a self-tapping screw thread (GB/T 5280-2002, idtISO 1478.1999)
3 Materials
Self-tapping screws by cold heading, carburizing steel.
4. Technical Requirements
4.1 Metallographic
4.1.1 Surface hardness
After the heat treatment of the surface hardness of the self-tapping screws should ≥450HV0.3 (see GB/T 4340.1).
4.1.2 case depth
Tapping screw case depth shall comply with the provisions in Table 1.
Table 1 case depth in millimeters
Thread Size
Case depth
min max
ST2.2, ST2.6 0.04 0.10
ST2.9, ST3.3, ST3.5 0.05 0.18
ST3.9, ST4.2, ST4.8, ST5.5 0.10 0.23
ST6.3, ST8, ST9.5 0.15 0.28
4.1.3 Core Hardness
After the heat treatment of the self-tapping screw core hardness should be.
Thread size ≤ST3.9. 270HV5 ~ 370HV5;
Thread size ≥ST4.2. 270HV10 ~ 370HV10.
4.1.4 Microstructure
Between the carburized layer and the core portion of the microstructure not banded Hypoeutectoid ferrite.
4.2 Mechanical properties
4.2.1 screwing performance
According to the provisions of 6.2.1, when the self-tapping screw into the test plate, can attack out its matching internal thread, while tapping screw thread shall not be damaged.
4.2.2 torques
Tapping screw should have a torsional strength to ensure that when tested according to 6.2.2, tapping screw torques should be equal to or greater than Table 3
Provisions.
5 Acceptance
But for all technical inspection arbitration, the provisions of Chapter 4; routine acceptance tests can only be screwed into the performance, breakaway and core hardness test
Surgery requirements should be met.
6 Test methods
6.1 Metallographic
6.1.1 Surface hardness test
Vickers hardness test according to GB/T 4340.1 regulations.
Surface hardness test shall be on a plane, and preferentially self-tapping screw head conduct.
6.1.2 case depth - METALLOGRAPHY
Case depth flank test shall be carried out at the measuring point should be 1/2 of the tooth crest and bottom distance. For thread size ≤ST3.9
Self-tapping screws, should be measured at the end of the tooth.
Arbitration test shall be used in the thread profile metallographic specimen test force of 300g of micro Vickers hardness. Case depth should Zichao
Had played actual core hardness of 30HV point calculation.
6.1.3 core hardness test
Core Vickers hardness test shall GB/T 4340.1 requirements and should be self-tapping screws from the end of a sufficient distance (due full thread
1/2 radius were small diameter) of the cross section.
6.1.4 Microstructure test
Microstructure metallographic examination test shall be the appropriate standard.
6.2 Mechanical Performance Test
6.2.1 screwing performance test
The self-tapping screws specimen (acceptance, plated or uncoated) screwed into the test plate, until there is a complete thread completely through the test button
Inspection plate.
Test panels shall be ≤0.23% carbon content, low carbon steel, its hardness should 130HV ~ 170HV (according to GB/T 4340.1 Determination).
Thickness of the test plate should be consistent with the provisions of Table 2.
Test wells may be drilled, punched or after the first drilling, reaming or made provisions in Table 2 of its aperture.
Table 2 is screwed into the performance test using a standard test plate thickness and pore size in millimeters
Thread Size
Thickness aperture
min max min max
ST2.2 1.17 1.30 1.905 1.955
ST2.6 1.17 1.30 2.185 2.235
ST2.9 1.17 1.30 2.415 2.465
ST3.3 1.17 1.30 2.68 2.73
ST3.5 1.85 2.06 2.92 2.97
ST3.9 1.85 2.06 3.24 3.29
ST4.2 1.85 2.06 3.43 3.48
ST4.8 3.10 3.23 4.015 4.065
ST5.5 3.10 3.23 4.735 4.785
ST6.3 4.67 5.05 5.475 5.525
ST8 4.67 5.05 6.885 6.935
ST9.5 4.67 5.05 8.270 8.330
Self-tapping screws have been delivered by the user layer (or other coating controlled by the user), because the coating on the fracture caused by the manufacturer will not be
Be responsible for. If the fracture without any post-treatment arising shall be the responsibility of the manufacturer. Coating has chipped off the self-tapping screws can not be used as specimen.
6.2.2 Test torques
Self-tapping screw shank specimen (acceptance when there is no plating or coating) should be clamped with tapping screw thread that matches the opening and closing thereof
Within his means; tapping screw clamping portion should not damage, and at least two buckle complete thread protruding clamping device, in addition to the end of the self-tapping screws, at least,
There are two buckle complete thread clamped in the jig. Mold clamping device should be blind holes (Fig. 1), the depth of the hole should ensure that fracture occurs at the end of the self-tapping screw
Beyond the end.
According to GB/T 3098.13-1996 specified in 3.2.2, using a calibrated torque - measuring device, the self-tapping screw torque is applied until break
crack. Self-tapping screws shall conform to Table 3 destruction torque values.
Explanation.
1 --- blind hole or opening and closing the mold;
2 --- blind hole die;
3 --- mold opening and closing.
A torque test apparatus of FIG.
Table 3 destruction units Nm of torque
Thread Size
Torques
min
ST2.2 0.45
ST2.6 0.9
ST2.9 1.5
ST3.3 2.0
ST3.5 2.7
ST3.9 3.4
ST4.2 4.4
ST4.8 6.3
ST5.5 10.0
ST6.3 13.6
ST8 30.5
ST9.5 68.0