GB/T 3098.13-1996 English PDF (GBT3098.13-1996)

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GB/T 3098.13-1996: Mechanical properties of fasteners. Torsional test and minimum torques for bolts and screws with nominal diameters from 1mm to 10mm
GB/T 3098.13-1996
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
Mechanical properties of fasteners - Torsional test and
minimum torques for bolts and screws with nominal
diameters 1 mm to 10 mm
公称直径 1 ~ 10 mm
(IDT ISO898-7:1992)
APPROVED ON: DECEMBER 18, 1996
IMPLEMENTED ON: JULY 01, 1997
Approved by: State Bureau of Technical Supervision
Table of Contents
Foreword ... 3 
ISO Foreword ... 5 
1 Scope ... 6 
2 Normative references ... 6 
3 Torque test ... 6 
4 Minimum breaking torque ... 7 
Appendix A (Informative) Comment ... 9 
Foreword
This standard is equivalent to the international standard ISO 898-7:1992
"Mechanical properties of fasteners - Part 7: Torsional test and minimum
torques for bolts and screws with nominal diameters 1 mm to 10 mm".
The general title of GB 3098 is "Mechanical properties of fasteners", including
the following parts:
- GB 3098.1-82 Mechanical properties of fasteners - Bolts, screws and studs
- GB 3098.2-82 Mechanical properties of fasteners - Nuts - Coarse thread
- GB 3098.3-82 Mechanical properties of fasteners - Set screws
- GB 3098.4-86 Mechanical properties of fasteners - Nuts with fine pitch
thread
- GB 3098.5-85 Mechanical properties of fasteners - Tapping screws
- GB 3098.6-86 Mechanical properties of fasteners - Stainless steel bolts,
screws and studs
- GB 3098.7-86 Mechanical properties of fasteners - Thread rolling screws
-GB/T 3098.8-92 Mechanical properties of fasteners - Components for belted
connections made mainly from materials with a high temperature strength
-GB/T 3098.9-93 Mechanical properties of fasteners - Prevailing torque type
steel hexagon nuts
-GB/T 3098.10-93 Mechanical properties of fasteners - Bolts, screws, studs
and nuts made of non-ferrous metals
- GB/T 3098.11-1995 Mechanical properties of fasteners - Self-drilling
tapping screws
- GB/T 3098.12-1996 Mechanical properties of fasteners - Cone proof load
test on nuts
- GB/T 3098.13-1996 Mechanical properties of fasteners - Torsional test and
minimum torques for bolts and screws with nominal diameters 1mm to 10
mm
Appendix A of this standard is an informative appendix.
This standard was proposed by the Ministry of Machinery Industry of the
People's Republic of China.
ISO Foreword
ISO (International Organization for Standardization) is a worldwide association
of national standards bodies (ISO member bodies). The formulation of
international standards is carried out through ISO technical committees. If each
member group is interested in a project carried out by a certain technical
committee, they can also participate in the committee. Governmental and non-
governmental international organizations related to iso can also participate in
this work. ISO has a close relationship with the International Electrotechnical
Commission (IEC) in terms of electrical standardization.
The draft international standard adopted by the technical committee is
distributed to all member groups for voting. The official publication of
international standards requires at least 75% of the member groups to vote for
it.
The international standard ISO 898-7 was formulated by the ISO/TC2 Fastener
Technical Committee and the SC1 Fastener Mechanical Performance
Subcommittee.
The general title of ISO 898 is "Mechanical properties of fasteners" and includes
the following parts:
- Part 1: Bolts, screws and studs
- Part 2: Coarse thread of nut with specified guaranteed load value
- Part 5: Set screws and similar threaded fasteners not subject to tensile
stress
- Part 6: Nuts with specified guaranteed load value - Fine thread
- Part 7: Torque test and minimum torque of bolts and screws with nominal
diameter 1 ~ 10 mm
Appendix A is an informative appendix.
Mechanical properties of fasteners - Torsional test and
minimum torques for bolts and screws with nominal
diameters 1 mm to 10 mm
1 Scope
This standard specifies the torque test and breaking torque values of bolts and
screws with a nominal diameter of 1 ~ 10 mm and a performance level of 8.8 ~
12.9 (GB 3098.1).
This standard applies to bolts and screws whose thread size is smaller than M3
and the minimum tensile load and guaranteed load are not specified in GB
3098.1, as well as the bolts and screws with a nominal diameter of 3 ~ 10 mm
whose length is too short to carry out the tensile test.
The breaking torque does not apply to hexagon socket set screws.
2 Normative references
The clauses contained in the following standards constitute the clauses of this
standard by being quoted in this standard. At the time of publication, the editions
indicated were valid. All standards will be revised; all parties using this standard
shall study the possibility of using the latest version of the following standard.
GB 3098.1-82 Mechanical properties of fasteners - Bolts, screws and
studs
3 Torque test
3.1 Principle
Clamp the tested bolt or screw in the test device and measure its breaking
torque.
3.2 Device (instrument)
3.2.1 Torque test device, as shown in Figure 1.
3.2.2 The indicated value of the torque meter shall not exceed five times the