GB/T 3098.3-2016 PDF in English
GB/T 3098.3-2016 (GB/T3098.3-2016, GBT 3098.3-2016, GBT3098.3-2016)
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Mechanical properties of fasteners -- Set screws
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GB/T 3098.3-2016: PDF in English (GBT 3098.3-2016) GB/T 3098.3-2016
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 21.060.10
J 13
Replacing GB/T 3098.3-2000
Mechanical Properties of Fasteners – Set Screws
(ISO 898-5.2012, Mechanical Properties of Fasteners Made of Carbon Steel
and Alloy Steel – Part 5. Set Screws and Similar Threaded Fasteners with
Specified Hardness Classes – Coarse Thread and Fine Pitch Thread, 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 ... 7
2 Normative References ... 7
3 Terms and Definitions ... 8
4 Codes ... 9
5 Marking System ... 10
6 Materials ... 10
7 Mechanical and Physical Properties ... 11
8 Applicability of Test Method ... 12
9 Test Methods ... 12
10 Mark ... 21
Appendix A (Informative) Reduce Hydrogen Embrittlement after Set Screw
Electroplating ... 23
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 3098.4 Mechanical Properties of Fasteners – Nuts - Fine Pitch Thread;
--- 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 3 of GB/T 3098.
This Part was drafted as per the rules specified in GB/T 1.1-2009.
This Part replaced GB/T 3098.3-2000 Mechanical Properties of Fasteners – Set
Screws; compared with GB/T 3098.3-2000, the major technical changes are as follows.
--- Expand the thread specification from d=24mm to d=30mm, and specified the fine
pitch thread of M8×1~M30×2(Chapter 1);
--- Replace “property class” by “hardness grade”; add “only applicable to the
compressive stress” (Chapter 1);
--- Add “the usage temperature of fastener produced as per this Part is -
50°C~+150°C. when the usage temperature exceeds the range of -
50°C~+150°C, or as higher as +300°C, the users shall consult the relative parties”
(Chapter 1);
--- Add terms and definitions, as well as codes (Chapter 3, Chapter 4);
--- Add “if the mechanical and physical properties specified in Table 2 and Table 3
are conformed to, then the marking system of hardness grade specified in this
Part can also use the specification exceeding the standard scope (d>30mm)”
(Chapter 5);
--- For 45H-grade alloy steel, add “f these alloy steel shall contain at least one of the
following elements, thereof the minimum content is 0.30% chromium, 0.30%
nickel, 0.20% molybdenum, 0.10% vanadium. When containing two, three or four
composite alloy compositions, the alloying element content shall be no less than
70% total content sum of single alloying element” (Table 2).
--- For Class 22H~45H mechanical and physical properties and the table note,
increase “no carburization HV0.3” and “when adopting the measuring surface
hardness and core hardness of HV0.3, the surface hardness of fastener shall be
no 30HV higher than the core hardness (see Figure 3)” (Table 3);
Mechanical Properties of Fasteners – Set Screws
1 Scope
This Part of GB/T 3098 specifies the mechanical and physical properties of set screws
and similar threaded fasteners with specified hardness classes, which are
manufactured by carbon steel or alloy steel, and tested at the environmental
temperature of 10°C~35°C. At such environmental temperature range, assess the
fasteners (including set screws and similar threaded fasteners with specified hardness
classes, the same below) as per the requirements of this Part. The fasteners meeting
the requirements of this Part shall be classified as per the specified hardness class,
and are only applicable to the compressive stress.
NOTE. The applicable usage temperature of fasteners produced as per this Part is -
50°C~+150°C. When the usage temperature exceeds the range of -50°C~+150°C, even as
higher as +300°C, the users shall consult to the relative parties.
This Part applicable set screws and similar threaded fasteners.
--- Manufactured by carbon steel or alloy steel;
--- Conform to the ordinary thread specified in GB/T 192;
--- Coarse pitch thread M1.6~M30; fine pitch thread M8×1~M30×2;
--- Conform to the diameter and pitch combination specified in in GB/T 193 and
GB/T 9144;
--- Conform to the thread tolerance specified in GB/T 197 and GB/T 9145.
This Part didn’t specify the following property requirements.
--- Tensile strength;
--- Shear strength;
--- Weldability;
--- Corrosion resistance;
--- Property requirement with working temperature higher than +150°C or lower than
-50°C.
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 90.3 Fasteners—Quality Assurance System (GB/T 90.3-2010, ISO
16426.2002, IDT)
GB/T 192 General Purpose Metric Screw Threads-Basic Profile (GB/T 192.2003,
ISO 68-1. 1998, MOD)
GB/T 193 General Purpose Screw Threads--Diameters and Pitches (GB/T 193-
2003, ISO 261.1998, MOD)
GB/T 197 General Purpose Metric Screw Threads – Tolerances (GB/T 197-2003,
ISO 965-1.1998, MOD)
GB/T 230.1 Metallic Rockwell Hardness Test - Part 1. Test Method (Scales A, B,
C, D, E, F, G, H, K, N, T) (GB/T 230.1-2009, ISO 6508-1.2005, MOD)
GB/T 231.1 Metallic Materials - Brinell Hardness Test - Part 1. Test Method (GB/T
231.1-2009, ISO 6506-1.2005, MOD)
GB/T 2516 General Purpose Metric Screw Threads - Limit Deviations (GB/T 2516-
2003, ISO 965-3.1998, MOD)
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 5267.1 Fasteners - Electroplated Coatings (GB/T 5267.1-2002, ISO
4042.1999, IDT)
GB/T 5276 Fasteners - Bolts, Screws, Studs and Nuts - Symbols and Descriptions
of Dimensions (GB/T 5276-2015, ISO 225. 2010, MOD)
GB/T 5779.1 Fasteners - Surface Discontinuities - Bolts, Screws and Studs for
General Requirements (GB/T 5779.1-2000, idt ISO 6157-1.1988)
GB/T 9144 General Purpose Metric Screw Threads - Preferable Plan (GB/T 9144-
2003, ISO 262.1998, MOD)
GB/T 9145 General Purpose Screw Threads - Limits of Sizes for Commercial Bolt
and Nut Threads - Medium Quality (GB/T 9145-2003, ISO 965-2.1998, MOD)
3 Terms and Definitions
The following terms and definitions are applicable to this document.
3.1 Base metal hardness
The hardness closest to the surface before the increase or decrease of hardness
caused by the expression of carburization or decarburization (during test, transverse
8 Applicability of Test Method
8.1 Manufacturer inspection
The fasteners manufactured as per this Part shall conform to the technical
requirements of Table 3~Table 5.
This Part d...
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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