GB/T 3098.2-2015 PDF English
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| GB/T 3098.2-2015 | English | 145 |
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Mechanical properties of fasteners -- Nuts
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| GB/T 3098.2-2000 | English | 299 |
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Coarse thread fasteners mechanical properties of nuts
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| GB/T 3098.2-1982 | English | RFQ |
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Mechanical properties of fasteners--Nuts
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GB/T 3098.2-2015: Mechanical properties of fasteners -- Nuts---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT3098.2-2015
GB
NATIONAL STANDARD
ICS 21.060.10
J 13
Replacing GB/T 3098.2-2010, GB/T 3098.4-2000
Mechanical properties of fasteners - Nuts
(ISO 898-2.2012, Mechanical properties of fasteners made of carbon
steel and alloy steel - Part 2.Nuts with specified property classes -
Coarse thread and fine pitch thread, MOD)
Issued on. DECEMBER 10, 2015
Implemented on. JANUARY 01, 2017
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the People's Republic of China;
Standardization Administration of the PRC.
Table of Contents
Foreword... 3
1 Scope... 7
2 Normative references... 8
3 Symbols... 9
4 Designation systems... 10
5 Design of bolt and nut assemblies... 11
6 Materials... 12
7 Mechanical properties... 14
8 Inspection... 18
9 Test method... 19
10 Marking... 24
Appendix A (Informative) Design principles of nuts... 29
Appendix B (Informative) Thread dimensions for the test mandrel... 32
Foreword
GB/T 3098 “Mechanical properties of fasteners” is composed of 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 - Self-drilling tapping
screws;
- 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 - Fasteners - Mechanical
properties - 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 is part 2 of GB/T 3098.
This part was drafted in accordance with the rules given in GB/T 1.1-2009.
This part replaces GB/T 3098.2-2000 “Mechanical properties of fasteners -
Nuts - Coarse thread” and GB/T 3098.4-2000 “Mechanical properties of
fasteners - Nuts - Fine pitch thread”.
As compared with GB/T 3098.2-2000 and GB/T 3098.4-2000, the main
changes of this part are as follows.
- COMBINE the two standards, MODIFY the standard name;
- ADD the examples for selection and application of low temperature and
high temperature steel, AND it may make reference to the contents of EN
10269, ASTM F 2281 and ASTM A 320/A 320M (SEE note 2 of Clause 1);
- SPEFICY the code used in this part (SEE Clause 3);
- SPECIFY the three types of nuts and their markings based on nut height
(SEE 4.1);
- ADD the design requirements for the bolt-nut connection (SEE Clause 5,
Appendix A);
- ADD that “when a thin nut is used as a lock nut, it shall be used together
with a regular nut or high nut. During installation, it shall firstly tighten the
thin nut on the assembly part, AND then tighten the regular nut or high nut
on the thin nut”; (SEE Clause 5);
- CANCEL the style 1 grade 4 coarse thread nuts (SEE Table 1 ~ Table 6);
- MAKE the following requirements for the coarse thread 04, 5, 6, 8 (style 2),
8 (style 1, D ≤ M16), and grade 9 AND the fine pitch thread 04, 5, 6 (D ≤
M16) and grade 8 nuts “it may be quenched and tempered at the discretion
of the manufacturer”; (SEE footnote d of Table 3);
- ADD the requirements “it shall have sufficient hardenability” for the product
material requiring “quenching and tempering”; (SEE footnote e of Table 3);
- Not SPECIFY the proof stress, thread stress cross-sectional area, and the
thin nut failure load (SEE Table 7; Table 3, Table 5, Table 6 and Table 7 of
2000 version);
- ADD Brinell hardness and Rockwell hardness indicators (SEE Table 6,
Table 7);
- ADD the provisions that the manufacturer, supplier and purchaser may
choose their own method to test the quality of products (SEE Clause 8);
- ADD the requirements for testing machines and fixtures (SEE 9.1.3);
- ADD that “The sample shall be such nuts as passing the size inspections,
the GB/T 228.1 is referred, the separation rate of the test machine chuck
shall not exceed 3 mm/min, AND during the test, it shall limit the conditions
exceeding the proof load value at the minimum degree” (SEE 9.1.5);
- This part specifies that the minimum load for the Vickers hardness test is
98 N, and adds the Brinell hardness test load (SEE 9.2.3.1);
- In this part, USE the “Appendix A. Design principles of nuts” to replace the
“Appendix A. Bolt connection bearing capacity” of GB/T 3098.2-2000, and
ADJUST comprehensively the relevant content;
- In this part, “Failure mode of bolt-nut connection” does not contain
“looseness of nuts and screws” (SEE A.1; 3.1 of 2000 version);
- In this part, ADD the “Appendix B. Test mandrel thread size”.
This part, through the re-drafting method, modifies and adopts the ISO
898-2.2012 “Mechanical properties of fasteners made of carbon steel and alloy
steel - Part 2.Nuts with specified property classes - Coarse thread and fine
pitch thread” (English version).
As compared with ISO 898-2.2012, the main changes are as follows.
- CHNAGE the standard name;
- In the reference documents, USE Chinese standards to replace
international standards (SEE Clause 2);
- ISO 898-2 makes reference to “ISO286-2 Geometrical product
specifications (GPS) - ISO code system for tolerances on linear sizes -
Part 2.Tables of standard tolerance grades and limit deviations for holes
and shafts” (SEE Clause 2);
- In ISO 898-2, it specifies that “These tests shall be carried out in the
manufacturing process or in the final inspection”, which is in contradiction
with the provisions of 8.1 for the manufacturer's inspection, so it is not
adopted in this part (SEE Clause 7, 8.1);
- In ISO 898-2, it does not specify the basis for hardness conversion; in this
part, it specifies that if using the Brinell or Rockwell hardness test, it shall
conduct conversion in accordance with ISO 18265.2013 (SEE 9.2.2).
This part was proposed by the China Machinery Industry Federation.
This part shall be under the jurisdiction of the National Standardization
Technical Committee on Fasteners (SAC/TC 85).
The responsible drafting organization of this part. China Machine Productivity
Promotion Center.
This participating drafting organizations of this part. Haiyan Yuxing Nut Co.,
Ltd., Shanghai Shenguang High Strength Bolt Co., Ltd., Shanghai Jinma High
Strength Fastener Co., Ltd., Hebei Xinde Power Accessories Co., Ltd., Ningbo
Jiulong Fastener Manufacturing Co., Ltd. Shandong Gaoqiang Fasteners Co.,
Ltd., Zhejiang Huarui Standard Parts Co., Ltd., Jinyi Industrial Co., Ltd.,
Machinery Industry General Parts Product Quality Supervision and Testing
Center, Ningbo Mingli Fasteners Co., Ltd.
As for this part, the Secretariat of the National Standardization Technical
Committee for Fasteners is responsible for interpretation.
This part replaces the standard previously issued as follows.
- GB/T 3098.2-1982, GB/T 3098.2-2000.
- GB/T 3098.4-1986, GB/T 3098.4-2000.
Mechanical properties of fasteners - Nuts
1 Scope
This part of GB/T 3098 specifies the mechanical and physical properties of the
nuts with coarse thread and fine pitch thread made of carbon steel or alloy
steel when tested at ambient temperature range of 10 °C to 35 °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 document.
3 Symbols
For the purposes of this document, the following symbols apply.
4 Designation systems
The marking and labelling of nuts with property classes shall be as specified in
Clause 10 for only those nuts which meet all applicable requirements of this
part.
The ranges of nominal diameters in relation to nut style and property class are
as given in Table 1.
5 Design of bolt and nut assemblies
Explanations of basic design principles of nuts and loadability of bolted
assemblies are given in Appendix A.
Thin nuts used as jam nuts shall be assembled together with a regular nut or
high nut.
6 Materials
Table 3 specifies the material and heat treatment for different property classes
of nuts.
7 Mechanical properties
When tested by the methods specified in Clause 9, the nuts of the specified
property class shall meet, at ambient temperature, the requirements for the
proof loads (SEE Table 4 and 5) AND for the hardness (SEE Table 6 and 7).
8 Inspection
The supplier tests the nuts which he provides using methods of their choice
(periodic evaluation of the manufacturer, checking of test results from the
manufacturers, physical tests on the nuts, etc), provided the mechanical and
physical properties specified in Table 3, 4, 5, 6 and 7 are met.
9 Test method
The tensile testing machine shall be in accordance with GB/T 16825.1, class 1
or better. Side thrust on the nut shall be avoided, e.g. by self-aligning grips.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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