GB/T 3098.7-2000 PDF English
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| GB/T 3098.7-2000 | English | 70 |
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Mechanical properties of fasteners. Thread rolling screws
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| GB/T 3098.7-1986 | English | RFQ |
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Mechanical properties of fasteners--Thread forming screws--Metric coarse thread series
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GB/T 3098.7-2000: PDF in English (GBT 3098.7-2000) GB/T 3098.7-2000
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 21.060.10
J 13
GB/T 3098.7-2000 / idt ISO 7085:1999
Replacing GB/T 3098.7-1986
Mechanical properties of fasteners -
Thread rolling screws
ISSUED ON: SEPTEMBER 26, 2000
IMPLEMENTED ON: FEBRUARY 01, 2001
Issued by: The State Bureau of Quality and Technical Supervision
Table of Contents
Foreword ... 3
ISO Foreword ... 6
1 Scope ... 7
2 Reference standards ... 7
3 Materials ... 8
4 Mechanical and working performance ... 8
5 Test methods ... 10
6 Torque wrenches ... 14
7 Marking ... 14
Foreword
This Standard is identical to the international standard ISO 7085:1999
"Mechanical and performance requirements of case hardened and tempered
metric thread rolling screws".
The general title of GB/T 3098 is "Mechanical properties of fasteners", including
the following parts:
- GB/T 3098.1-2000 Mechanical properties of fasteners - Bolts, screws and
studs
- GB/T 3098.2-2000 Mechanical properties of fasteners - Nuts - Coarse
thread
- GB/T 3098.3-2000 Mechanical properties of fasteners - Set screws
- GB/T 3098.4-2000 Mechanical properties of fasteners - Nuts - Fine pitch
thread
- GB/T 3098.5-2000 Mechanical properties of fasteners - Tapping screws
- GB/T 3098.6-2000 Mechanical properties of fasteners - Stainless steel bolts,
screws and studs
- GB/T 3098.7-2000 Mechanical properties of fasteners - Thread rolling
screws
- GB/T 3098.8-1992 Mechanical properties of fasteners - Components for
bolted connections made mainly from materials with a high temperature
strength
- GB/T 3098.9-1993 Mechanical properties of fasteners - Prevailing torque
type steel hexagon nuts
- GB/T 3098.10-1993 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 from 1mm
to 10mm
- GB/T 3098.14-2000 Mechanical properties of fasteners - Widening test on
nuts
- GB/T 3098.15-2000 Mechanical properties of fasteners - Nuts made of
stainless-steel
- GB/T 3098.16-2000 Mechanical properties of fasteners - Set screws made
of stainless-steel
- GB/T 3098.17-2000 Mechanical properties of fasteners - Preloading test
for the detection of hydrogen embrittlement - Parallel bearing surface
method
ISO 7085 does not specify the content of footnote 1) (Clause 1).
This Standard is a revised edition of GB/T 3098.7-1986. The main changes are
as follows:
a) Modify the standard name;
b) Delete the mechanical property grades distinguished by materials and the
material designations for reference (Table 1);
c) ADD the provisions of "core hardness after retempering" (Table 2,
subclauses 4.9 and 5.8);
d) Delete the requirement of "anti-hydrogen embrittlement torque" and quote
the requirements of GB/T 3098.17 (Table 2, subclauses 4.8 and 5.7);
e) Adjust the provisions of "breaking torque" (Table 2, Table 3, subclauses
4.5 and 5.4);
f) ADD the requirement that "the minimum tempering temperature is 340 °C"
(subclause 4.2);
g) Adjust the "core hardness" index (subclause 4.3);
h) INCREASE the angle of the ductility test to 7° (subclauses 4.6, 5.5 and
Figure 4);
i) CHANGE "tensile breaking load" to a reference value; and the test can
only be carried out by agreement between the purchaser and the supplier
(Table 3 and subclause 4.10);
j) ADD the requirements of marking (Clause 7);
Mechanical properties of fasteners -
Thread rolling screws
1 Scope
This Standard specifies the technical requirements for case hardened and
tempered thread rolling screws 1 ). Thread rolling screws according to this
Standard can produce various general female threads, in the range from 2 mm
~ 12 mm nominal thread diameter, for use in electromechanical products.
GB/T 3098.1 is not applicable to screws made according to this Standard.
2 Reference standards
The following standards contain provisions which, through reference in this
Standard, constitute provisions of this Standard. At the time of publication of
this Standard, the editions indicated are valid. All standards are subject to
revision. The parties who are using this Standard shall explore the possibility of
using the latest edition of the following standards.
GB/T 197-1981 General purpose screw threads - Tolerances and fits for
diameter from 1 to 355mm
GB/T 709-1988 Dimensions, shape, weight and tolerances for hot-rolled
plates and sheets
GB/T 3098.2-2000 Mechanical properties of fasteners - Nuts - Coarse thread
(idt ISO 898-2:1992)
GB/T 3098.17-2000 Mechanical properties of fasteners - Preloading test for
the detection of hydrogen embrittlement - Parallel bearing surface method
(idt ISO 15330:1999)
GB/T 4340.1-1999 Metallic materials - Vickers hardness test - Part 1: Test
method (eqv ISO 6507-1:1997)
GB/T 5267-1985 Electroplated coatings on threaded fasteners
1) It includes thread forming screws with a thread shank of arc-shaped triangular cross-
section in accordance with GB/T 6559.
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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