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GB/T 3098.2-2015 English PDF (GBT3098.2-2015)

GB/T 3098.2-2015 English PDF (GBT3098.2-2015)

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GB/T 3098.2-2015: Mechanical properties of fasteners -- Nuts

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 10C to 35C. Nuts conforming to the requirements of this part may not retain the specified mechanical and physical properties at elevated and/or lower temperature.
GB/T 3098.2-2015
GB
NATIONAL STANDARD
OF THE PEOPLE REPUBLIC OF CHINA
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);
- 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.
Nuts conforming to the requirements of this part may not retain the specified mechanical and physical properties at elevated and/or lower temperature. Note 1. The nuts conforming to the requirements of this part have been used in applications ranging from -50 ??C to +150 ??C. It is the responsibility of users to consult an experienced fastener material expert for temperatures outside the range of -50 ??C to +150 ??C and up to a maximum temperature of +300 ??C.
Note 2. Information for the selection and application of steels for use at lower and elevated temperatures is given for instance in EN 10269, ASTM F 2281 and ASTM A 320/A 320M.
This part is applicable to nuts.
a) Made of carbon steel or alloy steel;
b) With coarse thread M5 ??? D ??? M39, and fine pitch thread M8 x 1 ??? D ??? M39 x 3;
c) With the ordinary thread in accordance with GB/T 192;
d) With diameter/pitch combinations in accordance with GB/T 193 and GB/T 9144;
e) With the specified property classes, including proof load;
f) With the specified three nut styles. thin nuts, regular nuts, and high nuts; g) With minimum height mmin ??? 0.45D;
h) With a minimum outside diameter or width across flats side smin ??? 1.45D (SEE Appendix A);
i) Able to mate with bolts, screws, and studs with property classes in
accordance with GB/T 3098.1.
For technical requirements for surface treatment of hot dip galvanized nuts, SEE GB/T 5267.3.
This part does not specify requirements for properties such as.
- Prevailing torque properties (SEE GB/T 3098.9);
- Torque/clamp force properties (SEE GB/T 16823.3 for the test methods); - Weldability;
- Corrosion resistance.
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.
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 metric screw threads - General plan (GB/T
193-2003, ISO 261.1998, MOD)
GB/T 228.1 Metallic materials - Tensile testing - Part 1. Method of test...

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