GB/T 18230.6-2000 English PDF (GBT18230.6-2000)

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GB/T 18230.6-2000: Hexagon nuts for structural bolting, style 1, hot-dip galvanized (oversize tapped) - Product grades A and B - Property classes 5, 6 and 8
GB/T 18230.6-2000
NATIONAL STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
Hexagon Nuts for Structural Bolting, Style 1, Hot-dip
Galvanized (Oversize Tapped) - Product Grades A and
B - Property Classes 5.6 and 8
ISSUED ON. OCTOBER 17, 2000
IMPLEMENTED ON. MAY 01, 2001
Issued by. the State Bureau of Quality Technical Supervision
Table of Contents
Foreword ... 3
ISO Foreword ... Error! Bookmark not defined.
1 Scope ... 5
2 Normative references ... 5
3 Dimensions... 6
4 Technical conditions and normative references ... 8
5 Proof load ... 8
6 Marks ... 9
7 Marking ... 9
Annex A (Normative) Extreme Dimension of 6AX Internal Thread ... 10
Foreword
This Standard equivalently adopts international standard ISO 7413.1984 "Hexagon
Nuts for Structural Bolting, Style 1, Hot-dip Galvanized (oversize tapped) - Product
Grade A and B - Property Classes 5.6 and 8".
This Standard specifies packaging technical requirements which is not specified in
ISO 7413 (Table 2).
ISO 7413 does not cite ISO 225 Fasteners - Bolts, Screws, Studs and Nuts - Symbols
and Designations of Dimensions and ISO 8992 Fasteners - General Requirements for
Bolts, Screws, Studs and Nuts. This Standard amends provisions (see notes in
Chapter 3 and contents in Table 2) according to the latest ISO Fasteners Standard of
the same kind (such as ISO 4014. 1999 Hexagon Bolts of Grades A and B).
This Standard adds the provision (Table 2) of sherardizing which is not specified in
ISO 7413.
This Standard specifies the extreme dimension (Annex A1) of 6AX thread according
to ISO 965-5.1998 "ISO General Purpose Metric Screw Threads - Tolerances - Part 5.
Limits of Sizes for Internal Screw Threads to Mate with Hot-dip Galvanized External
Screw Threads with Maximum Size of tolerance Position h Before Galvanizing".
Annex A of this Standard is normative.
This Standard was proposed by State Administration of Machinery Industry.
This Standard shall be administered by the National Fastener Standardization of
Technical Committee.
Academy of Machinery Science and Technology is the responsible drafting
organization of this Standard. Shanghai Jinma High Strength Fastener Co., Ltd,
Shanghai High strength Bolts Plant, Shanghai Shenguang High strength Bolts Plant,
Zhejiang Shaoxing High Strength Fastener Plant, and Hebei Ren County High
strength Bolts Co., Ltd are the participating drafting organizations of this Standard.
ISO Foreword
ISO (International Standardization Organization) is a syndicate consisting of state
standard group (members of ISO) across the world. The formulation of the international
standard is made by all technical committees of ISO. Each member who is interested in
projects of certain technical committee can participate in the committee. Governmental
and non-governmental international organizations related with ISO can also take part in
the job. ISO is closely related with IEC in terms of electro-technical normalization.
International standard draft adopted by technical committee shall be distributed to all
member groups for voting. The official publication of international standards needs at least
75% votes by the member groups.
International standard ISO 7413 was formulated by ISO/TC 2 Fasteners Technical
Committee.
National Standard of the People's Republic of China
Hexagon Nuts for Structural Bolting, Style 1, Hot-dip Galvanized
(Oversize Tapped) - Product Grades A and B –
Property Classes 5.6 and 8
eqv ISO 7413.1984
1 Scope
This Standard specifies the hexagon nuts for structural bolting - thread specification of
M10 ~ M36, style 1, hot-dip galvanized according to GB/T 13912 or sherardized
according to GB/T 5067, oversize tapped according to 6AX, property classes of 5, 6
and 8, product grade of A used for d≤ M16, and product grade of B used for d>M16.
If other technical requirements are required, it shall be selected from current
standards (such as GB/T 196, GB/T 197, GB/T 3098.2, and GB/T 3103.1).
2 Normative references
The provisions contained in the following standards become part of this Standard,
through the reference of this Standard. At the time of publication of this Standard, the
shown versions of these standards are valid. All standards are subject to revision, and
all parties who use this Standard are encouraged to investigate the possibility of
applying the newest version of these standards.
GB/T 90-1985 Acceptance Inspection, Marking, and Packaging of Fasteners (eqv
ISO 3269.1984)
GB/T 196-1981 General Purpose Screw Threads - Basic Dimensions for Diameter
from 1 to 600 mm)
GB/T 197-1981 General Purpose Screw Threads - Tolerances and Fits for Diameter
from 1 to 355 mm)
GB/T 1237-2000 The Markings of Fasteners (eqv ISO 8991.1986)
Annex A
(Normative)
Extreme Dimension of 6AX Internal Thread
This Annex provides the extreme dimension of 6AX internal thread as adopted by the
hot-dip galvanized nuts. Extreme dimensions provided in Table A1 are applicable to
those hot-dip galvanized ones.
Table A1 Extreme Dimension of 6AX Thread mm
Thread
specification
Large diameter
m in
Medium diameter Small diameter
max m in max m in
M10 10.310 9.516 9.336 8.986 8.686
M12 12.365 11.428 11.228 10.806 10.471
M14 14.420 13.333 13.121 12.630 12.255
M16 16.420 15.333 15.121 14.630 14.255
M20 20.530 19.130 18.906 18.274 17.824
M24 24.640 22.956 22.691 21.892 21.392
M30 30.750 28.757 28.477 27.521 26.961
M36 36.860 34.562 34.262 33.130 32.530
Note. After galvanized, nut’s thread shall be tapped to above dimensions.