GB/T 18230.6-2000Hexagon nuts for structural bolting, style 1, hot-dip galvanized (oversize tapped) - Product grades A and B - Property classes 5, 6 and 8 (English PDF)
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Issued by
the State Bureau of Quality Technical Supervision
Level / Type
National · Recommended
Issue date
October 17, 2000
Implementation date
May 1, 2001
Scope
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) is available as an English-translated PDF.
GB/T 18230.6-2000 is the Chinese standard "Hexagon nuts for structural bolting, style 1, hot-dip galvanized (oversize tapped) - Product grades A and B - Property classes 5, 6 and 8".
Its scope clause reads: 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).
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Document preview — GB/T 18230.6-2000
National Standard of the People's Republic of China
Issued by: the State Bureau of Quality Technical Supervision
Contents
- Foreword3
- 1 Scope5
- 2 Normative references5
- 3 Dimensions6
- 4 Technical conditions and normative references8
- 5 Proof load8
- 6 Marks9
- 7 Marking9
- Annex A (Normative) Extreme Dimension of 6AX Internal Thread10
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.
GB/T 18230.1-2000 | GB/T 18230.2-2000 | GB/T 18230.3-2000 | GB/T 18230.5-2000 | GB/T 15389-2025 | […]
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 3 pages — is available in the English PDF.
Referenced standards
Normative references
- GB/T 196-1981General purpose metric screw threads - Basic dimensions
- GB/T 197-1981General purpose metric screw threads -- Tolerances
- GB/T 1237-2000Designation system for fasteners
GB/T 90-1985 · ISO 3269.1984 · ISO 8991.1986
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Related Standards
GB/T 1237-2000 — Designation system for fasteners
GB/T 18230.1-2000 — Hexagon bolts for high-strength structural bolting with large width across flats (thread lengths according to GB/T 3106) - Product grade C - Property classes 8 - 8 and 10 - 9
GB/T 18230.2-2000 — Hexagon bolts for high-strength structural bolting with large width across flats (short thread length) - Product grade C - Property classes 8 - 8 and 10 - 9
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GB/T 18230.6-2000
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