This national standard is modified in relation to international standard IS0 4032:1999 "Hexagon Head Screws - Product Grades A and B".
This standard is a part of national standards for "Hexagon Keys and Bits" product series which include:
a) Hexagon head bolts: GB/T 27, GB/T 28, GB/T 29.1, GB/T 29.2, GB/T 31.1, GB/T 31.2, GB/T 31.3, GB/T 32.1, GB/T 32.2, GB/T 32.3, GB/T 5780, GB/T 5781, GB/T 5782, GB/T 5783, GB/T 5784, GB/T 5785 and GB/T 5786;
b) Hexagon nuts: GB/T 41, GB/T 56, GB/T 802, GB/T 804, GB/T 805, GB/T 808, GB/T 889.1, GB/T 889.2, GB/T 923, GB/T 6170, GB/T 6171, GB/T 6172.1, GB/T 6172.2, GB/T 6173, GB/T 6174, GB/T 6175, GB/T 6176, GB/T 6178, GB/T 6179, GB/T 6180, GB/T 6181, GB/T 6182, GB/T 6184, GB/T 6185.1, GB/T 6185.2, GB/T 6186, GB/T 9457, GB/T 9458, GB/T 9459 and GB/T 18195;
c) Hexagon flange bolt: GB/T 5789, GB/T 5790 and GB/T 16674;
d) Hexagon flange nut: GB/T 6177.1, GB/T 6177.2, GB/T 6183.1, GB/T 6183.2, GB/T 6187.1 and GB/T 6187.2;
e) Bolt connecting assembly for structural bolting: GB/T 1228, GB/T 1229, GB/T 1230, GB/T 3632, GB/T 16939, GB/T 18230.1, GB/T 118230.2, GB/T 18230.3, GB/T 18230.4, GB/T 18230.5, GB/T 18230.6 and GB/T 18230.7;
f) Hexagon head screw, wood screw, self-tapping screw and assembly: GB/T 838, GB/T 102, GB/T 5285, GB/T 6563, GB/T 9456, GB/T 15856.4, GB/T 16824.1, GB/T 16824.2, GB/T 9074.11, GB/T 9074.12, GB/T 9074.13, GB/T 9074.14, GB/T 9074.15, GB/T 9074.16, GB/T 9074.17, GB/T 9074.20, GB/T 9074.21, GB/T 9074.22 and GB/T 9074.23.
ISO 4032 doesn't specify packaging technical requirements, and this standard makes stipulation (Table 3).
ISO 4032 doesn't specify technical requirements on surface defects, and this standard makes stipulations (Table 3).
ISO 4032 doesn't specify simplified designations but this standard provides simplified designations (article 5.2) according to simplification principle of GB/T 11237.
This standard doesn't adopt list attached to ISO 4032 and its contents has been listed in foreword of this standard.
This standard is revision of GB/T 6170 - 1986 and major modifications are given below:
a) For washer face style, it is changed from permissible style to the style be indicated in order;
b) Division according to optimization extent of thread: Table 1 Preferred threads specifications (equivalent to table 1 and table 2 of former standard); table 2 non-preferred thread specifications (equivalent to Table 3 of former standard).
c) Add reference of GB/T 16938 General requirements (Table 3);
d) Add A4-50, A4-70 and non-ferrous metal nuts; it is required to adopt property class according to GB/T 3098.10 (Table 3);
e) Add non-electrolytically applied zinc flake coatings.
This national standard will replace GB/T 6170 - 11986 from the implementation date of this standard.
This standard is proposed by China Machinery Industry Bureau.
This standard is under the jurisdiction of National Technical Committee of Standardization for Fasteners.
This standard is in the charge of China Academy of Machinery Science and Technology and was drafted by Shanghai Biaosan Standard Parts Co., Ltd., Beijing Standard Fasteners Industrial (Group) Company, Ningbo Xiangxiang Large-scale Fastener Co., Ltd., Shenyang Standard Parts Co., Ltd. and Zhejiang High-Strength Fastener Factory.
Secretariat of National Technical Committee of Standardization for Fastener is responsible for the explanation of this standard.
ISO Foreword
ISO (International Organization for Standardization) is a worldwide united organization of all national standard organizations (ISO member organizations) in the world. Formulation of international standards is handled by ISO technical committees. Every member organization may take part in a certain committee if it is interested in the project of such committee. Government or nongovernmental international organization that related to ISO also shall take part in this job. ISO has close relation with International Electrotechnical Commission (IEC) in terms of electrotechnical standardization.
Drafting of international standard shall be carried out according to rules in part 3 of ISO/IEC guideline.
Draft international standard adopted by technical committee shall be given out to all member organizations for voting by ballot. Formal publication of international standard requires agreement of 75% members at least.
International standard ISO 4032 was formulated by ISO/TC 2 Technical Committee for Fastener.
The third edition is technical revision for carrying out deletion and supplement for the second edition (ISO 4032: 1999).
ISO Introduction
This international standard is a part of standards for "Exterior Hexagon Keys and Bits" ISO product series which contain:
a) Hexagonal head bolt (ISO 4014~4016 and ISO 8765) ;
b) Hexagon head screw (ISO 4017, ISO 4018 and ISO 8676) ;
c) Hexagon nuts (ISO 4032~4036 and ISO 8673~8675) ;
d) Hexagon flange bolt (ISO 4162 and ISO 15071) ;
e) Hexagon flange nut (ISO 4161 and ISO 10663) ;
f) Bolts and nuts for structural bolting (ISO 4775, ISO 7411~7414 and ISO 7417).
Hexagon Nuts, Style 1
1型六角螺母
1 Scope
This standard specifies hexagon nuts, style 1, whose thread specifications are M1.6~ M64, property class are class 6, 8, 10, A2-50, A2-70, A4-50, A4-70, CU2, CU3 and AL4, product grade are grades A and B. Those of grade A shall be used for nuts whose D≤16 mm; and grade B shall be used for nuts whose D>6 mm.
If other technical requirements are required, they shall be selected from current standards (such as GB/T 196, GB/T 3098.2, and GB/T 3103.1).
2 Normative references
The following standards contain provisions which constitute provisions of this standard through reference in this text. At time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below.
GB/T 90-1985 Acceptance Inspection, Marking and Packaging of Fasteners (eqv ISO 3269: 1984)
GB/T 196-1981 General Purpose Metric screw threads - Basic dimensions (for diameter from 1 to 600mm)
GB/T 197-1981 General Purpose Screw Threads - tolerances and fits (for diameter from 1 to 355mm)
GB/T 1237-2000 Designation System for Fasteners (eqv ISO 8991: 1986)
GB/T 3098.2-2000 Mechanical Properties of Fasteners - Nuts - Coarse Thread (idt ISO 898-2: 1992)
GB/T 3098.10-1993 Mechanical properties of Fasteners - Bolts, Screws, Studs and nuts made of non-ferrous metals screw (eqv ISO 8839: 1986)
GB/T 3098.15-2000 Mechanical Properties of Fasteners - Nuts Made of Stainless Steel (idt ISO 3506-2: 1997)
GB/T 3103.1-1982 (Affirmed in 1988) Tolerances for Fasteners - Bolts, Screws and Nuts. (eqv ISO 4759-1: 1978)
GB/T 5267-1985 Electroplated Coatings on Threaded Fasteners
GB/T 5276-11985 Fasteners - Bolts, Screws, Studs and Nuts - Symbols and Designations of dimensions (eqv ISO 225: 1983)
GB/T 5779.2-2000 Fasteners - Surface Discontinuities - Nuts (idt ISO 6157-2: 1995)
GB/T 16938-1997 Fasteners—General Requirements for Blots, Screws, Studs and Nuts (idt ISO 8992: 1986)
ISO 10683: 2000 Fastener - Non-electrolytically Applied Zinc Flake Coatings
3 Dimensions
Note: Symbols and designation of dimensions shall comply with GB/T 5276.
1) β=15°-30°.
2) Washer face style shall be indicated in order.
3) θ=90°~120°.
Figure 1
Table 1 Preferred thread specifications mm
Thread specification D M1.6 M2 M2.5 M3 M4 M5 M6 M8 M10 M12
P1) 0.35 0.4 0.45 0.5 0.7 0.8 1 1.25 1.5 1.75
c max 0.2 0.2 0.3 0.40 0.40 0.50 0.50 0.60 0.60 0.60
min 0.1 0.1 0.1 0.15 0.15 0.15 0.15 0.15 0.15 0.15
da max 1.84 2.3 2.9 3.45 4.6 5.75 6.75 8.75 10.8 13
min 1.60 2.0 2.5 3.00 4.0 5.00 6.00 8.00 10.0 12
dw min 2.4 3.1 4.1 4.6 5.9 6.9 8.9 11.6 14.6 16.6
e min 3.41 4.32 5.45 6.01 7.66 8.79 11.05 14.38 17.77 20.03
m max 1.30 1.60 2.00 2.40 3.2 4.7 5.2 6.80 8.40 10.80
min 1.05 1.35 1.75 2.15 2.9 4.4 4.9 6.44 8.04 10.37
mw min 0.8 1.1 1.4 1.7 2.3 3.5 3.9 5.2 6.4 8.3
s nominal=max 3.20 4.00 5.00 5.50 7.00 8.00 10.00 13.00 16.00 18.00
min 3.02 2.82 4.82 5.32 6.78 7.78 9.78 12.73 15.73 17.73
Thread specification D M16 M20 M24 M30 M36 M42 M48 M56 M64
P1) 2 2.5 3 3.5 4 4.5 5 5.5 6
c max 0.8 0.8 0.8 0.8 0.8 1.0 1.0 1.0 1.0
min 0.2 0.2 0.2 0.2 0.2 0.3 0.3 0.3 0.3
da max 17.3 21.6 25.9 32.4 38.9 45.4 51.8 60.5 69.1
min 16.0 20.0 24.0 30.0 36.0 42.0 48.0 56.0 64.0
dw min 22.5 27.7 33.3 42.8 51.1 60 69.5 78.7 88.2
e min 6.75 32.95 39.55 50.85 6.79 71.3 82.6 93.56 104.86
m max 14.8 18.0 21.5 25.6 31.0 34.0 38.0 45.0 51.0
min 14.1 16.9 20.2 24.3 29.4 32.4 36.4 43.4 49.1
mw min 11.3 13.5 16.2 19.4 23.5 25.9 29.1 34.7 39.3
s nominal=mix 24.00 30.00 36 46 55.0 65.0 75.0 85.0 95.0
min 23.67 29.16 35 45 53.8 63.1 73.1 82.8 92.8
1) P - Thread pitch.
Table 2 Non-preferred thread specifications mm
Thread specification D M3.5 M14 M18 M22 M27 M33 M39 M45 M52 M60
P1) 0.6 2 2.5 2.5 3 3.5 4 4.5 5 5.5
c max 0.40 0.60 0.8 0.8 0.8 0.8 1.0 1.0 1.0 1.0
min 0.15 0.15 0.2 0.2 0.2 0.2 0.3 0.3 0.3 0.3
da max 4.0 15.1 19.5 23.7 29.1 35.6 42.1 48.6 56.2 64.8
min 3.5 14.0 18.0 22.0 27.0 33.0 39.0 45.0 52.0 60.0
dw min 5 19.6 24.9 31.4 38 46.6 55.9 64.7 74.2 83.4
e min 6.58 23.36 29.56 37.29 45.2 55.37 66.44 76.95 88.25 99.21
m max 2.80 12.8 15.8 19.4 23.8 28.7 33.4 36.0 42.0 48.0
min 2.55 12.1 15.1 18.1 22.5 27.4 31.8 34.4 40.4 46.4
mw min 2 9.7 12.1 14.5 18 21.9 25.4 27.5 32.3 37.1
s nominal=max 6.00 21.00 27.00 34 41 50 60.0 70.0 80.0 90.0
min 5.82 20.67 26.16 33 40 49 58.8 68.1 78.1 87.8
1) P - Thread pitch
4 Technical requirements and normative references
