GB/T 3098.9-2020 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Name of Chinese Standard | Status |
| GB/T 3098.9-2020 | English | 385 |
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Mechanical properties of fasteners -- Prevailing torque type steel nuts
| Valid |
| GB/T 3098.9-2010 | English | 150 |
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Mechanical properties of fasteners -- Prevailing torque type steel nuts
| Obsolete |
| GB/T 3098.9-2002 | English | 839 |
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Mechanical properties of fasteners -- Prevailing torque type steel hexagon nuts
| Obsolete |
| GB/T 3098.9-1993 | English | 279 |
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Mechanical properties of fasteners. Prevailing torque type steel hexagon nuts
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GB/T 3098.9-2020: PDF in English (GBT 3098.9-2020) GB/T 3098.9-2020
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;
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.
This Part applies to prevailing torque all metal type nuts and prevailing torque
non-metallic insert type nuts:
- with general purpose thread in accordance with GB/T 192;
- with diameter/pitch combination in accordance with GB/T 193 and GB/T
9144;
- with coarse pitch thread M5 to M39 or with fine pitch thread with nominal
diameter d = 8 mm ~ 39 mm;
- with thread tolerances in accordance with GB/T 9145;
- with mechanical properties in accordance with GB/T 3098.2;
Prevailing torque values specified in this Part are based on laboratory test
conditions.
Note 1: Actual prevailing torques in practical application can vary.
Note 2: Prevailing torque all metal type nuts conforming to the requirements of this Part
are used in applications ranging from −50 °C to +150 °C.
Note 3: Prevailing torque non-metallic insert type nuts conforming to the requirements of
this Part are used in applications ranging from −50 °C to +120 °C.
WARNING: When used outside the ambient temperature range, it may
influence the functional properties of the nuts (torque/clamp force and prevailing
torque properties), see Annex A.
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.
GB/T 3098.1 Mechanical properties of fasteners - Bolts, screws and studs
(GB/T 3098.1-2010, ISO 898-1:2009, MOD)
GB/T 3098.2 Mechanical properties of fasteners - Nuts (GB/T 3098.2-2015,
ISO 898-2:2012, MOD)
GB/T 5277 Fasteners - Clearance holes for bolts and screws (GB/T 5277-
1985, eqv ISO 273:1979)
GB/T 9145 General purpose metric screw threads - Limits of sizes for the
screw threads of medium quality and preferable plan (GB/T 9145-2003, ISO
965-2:1998, MOD)
GB/T 16823.3 Fasteners - Torque/clamp force testing (GB/T 16823.3-2010,
ISO 16047:2005, IDT)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T
16823.3 and the following apply.
3.1
Prevailing torque nut
Nut which is not free-running on a mating thread by virtue of a self-contained
prevailing torque feature, and which provides a certain degree of resistance to
rotation independent of clamping or compression forces.
3.2
Prevailing torque developed by the nut
Torque necessary to rotate the nut on its mating externally threaded component
and without axial force.
3.3
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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