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GB/T 3098.9-2020 PDF English

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GB/T 3098.9-2020: Mechanical properties of fasteners - Prevailing torque type steel nuts
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GB/T 3098.9: Evolution and historical versions

Standard IDContents [version]USDSTEP2[PDF] deliveryName of Chinese StandardStatus
GB/T 3098.9-2020English385 Add to Cart 0-9 seconds. Auto-delivery Mechanical properties of fasteners - Prevailing torque type steel nuts Valid
GB/T 3098.9-2010English150 Add to Cart 0-9 seconds. Auto-delivery Mechanical properties of fasteners -- Prevailing torque type steel nuts Obsolete
GB/T 3098.9-2002English839 Add to Cart 4 days Mechanical properties of fasteners -- Prevailing torque type steel hexagon nuts Obsolete
GB/T 3098.9-1993English279 Add to Cart 3 days Mechanical properties of fasteners. Prevailing torque type steel hexagon nuts Obsolete

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GB/T 3098.9-2020: Mechanical properties of fasteners - Prevailing torque type steel nuts

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GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 21.060.20 J 13 Replacing GB/T 3098.9-2010 Mechanical properties of fasteners - Prevailing torque type steel nuts (ISO 2320.2015, Fasteners - Prevailing torque steel nuts - Functional properties, MOD) Issued on. MARCH 31, 2020 Implemented on. OCTOBER 01, 2020 Issued by. State Administration for Market Regulation; Standardization Administration of the PRC.

Table of Contents

Foreword... 3 1 Scope... 6 2 Normative references... 7 3 Terms and definitions... 7 4 Symbols... 8 5 Thread... 9 6 Lubrication... 9 7 Mechanical properties of prevailing torque nuts... 9 8 Functional requirements for prevailing torque properties... 10 9 Test method... 18 Annex A (Normative) Temperature influence on prevailing torques of nuts with non-metallic insert... 24 Annex B (Informative) Principles for the evaluation of the total coefficient of friction, μtot... 25 Annex C (Informative) Test clamp force and prevailing torques for prevailing torque steel nuts M3 and M4 in property classes 8 and 10... 26 Bibliography... 27

Foreword

GB/T 3098 "Mechanical properties of fasteners" includes 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 - Parts for bolted connections for use at temperatures from -200 Celsius~+700 Celsius; - GB/T 3098.9 Mechanical properties of fasteners - Prevailing torque type steel 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 tapping 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 from 1 mm to 10 mm; - 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; - GB/T 3098.23 Mechanical properties of fasteners - M42~M72 bolts, screws and studs; - GB/T 3098.24 Mechanical properties of fasteners - Stainless steel and nickel alloy bolts, screws, studs and nuts for high temperature; - GB/T 3098.25 Mechanical properties of fasteners - Guide for selection of stainless steel and nickel alloy fasteners. This Part is Part 9 of GB/T 3098. This Part is drafted in accordance with the rules given in GB/T 1.1-2009. This Part replaces GB/T 3098.9-2010 "Mechanical properties of fasteners - Prevailing torque type steel nuts". Compared with GB/T 3098.9-2010, the main technical changes of this Part are as follows. - Delete nuts of class 9 (see Table 6 and Table 9 of the 2010 edition); - GIVE the data of thread specifications M3 and M4 as an annex (see Annex C); - Surface condition of the test bolt/screw shall be in accordance with GB/T 16823.3 (see 9.3.2); - In the test procedure, change the thread length of the test bolt/screw end protruding through the nut from "4 to 7 pitches" to "3 to 5 pitches" (see Figure 1 and 9.3.4); - CHANGE the method for determination of the prevailing-off torque value (see point 5 of Figure 2). This Part uses the redraft law to modify and adopt ISO 2320.2015 "Fasteners - Prevailing torque steel nuts - Functional properties". The technical differences between this Part and ISO 2320.2015 and their reasons are as follows. - In the normative references, replace the international standards with Chinese standards (see Clause 2), to comply with China's basic fastener standards; - In footnote a, add "When D > 24 mm, it is equal to 80 % of the proof load of class 4.8 for bolts", to meet the actual production (see Table 3). This Part also makes the following editorial change. - Modify the standard name. This Part was proposed by China Machinery Industry Federation. This Part shall be under the jurisdiction of National Technical Committee 85 on Fasteners of Standardization Administration of China (SAC/TC 85). Drafting organizations of this Part. China Productivity Center for Machinery, Haiyan Yuxing Nuts Co., Ltd., Gem-Year Industrial Co., Ltd., Shandong Gaoqiang Fastener Co., Ltd., Zhoushan 7412 Factory, Wenling Luogang Machinery Co., Ltd., Bossard Fastening Solutions (Shanghai) Co., Ltd., Hunan Shenyi Machinery Application Research Institute Co., Ltd., Beijing Automotive Technology Center Co., Ltd., Geely Automobile Research Institute (Ningbo) Co., Ltd., Meishan CRRC Fastening System Co., Ltd., Zhejiang New Oriental Auto- parts Co., Ltd., Shanghai High Strength Bolts Plant Co., Ltd., Mechanical Industry General Parts Product Quality Supervision and Testing Center. This Part is explained by National Technical Committee 85 on Fasteners of Standardization Administration of China. The previous editions of the standard replaced by this Part were released as follows. - GB/T 3098.9-1993, GB/T 3098.9-2002, GB/T 3098.9-2010; - GB/T 928-1980. Mechanical properties of fasteners - Prevailing torque type steel nuts

1 Scope

This Part of GB/T 3098 specifies the functional properties for prevailing torque steel nuts when tested at an ambient temperature of 10 °C to 35 °C. It includes a combined test method to determine the prevailing torque properties and the torque/clamp force properties at the same time.

2 Normative references

The following documents are indispensable for the application of this document. For the dated references, only the editions with the dates indicated are applicable to this document. For the undated references, the latest edition (including all the amendments) are applicable to this document.

3 Terms and definitions

For the purposes of this document, the terms and definitions given in GB/T 16823.3 and the following apply. Point in the tightening process where clamp force first appears.

4 Symbols

For the purpose of this document, the following symbols apply together with those defined in GB/T 16823.3.

5 Thread

Threads for the nuts shall be in accordance with GB/T 9145 except for the prevailing torque feature.

6 Lubrication

At the option of the manufacturer, a lubricant may be applied to the manufacturing lot to fulfil the functional requirements.

7 Mechanical properties of prevailing torque nuts

The mechanical properties of prevailing torque nuts shall conform to GB/T 3098.2.

8 Functional requirements for prevailing torque properties

The prevailing-on torque shall not exceed the value specified in Tables 1 to 7.

9 Test method

The proof load test shall be carried out in accordance with GB/T 3098.2. Additionally, the following applies.

Annex A

(Normative) Temperature influence on prevailing torques of nuts with non-metallic insert

Annex B

(Informative) Principles for the evaluation of the total coefficient of friction, μtot In Figure B.1, the tightening process runs up to a test clamp force of 80 % of the proof load of the mating bolt. ......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.


      

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