GB/T 5781-2016 English PDF (GBT5781-2016)

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GB/T 5781-2016: Hexagon head bolts -- Full thread -- Product grade C
GB/T 5781-2016
GB
NATIONAL STANDARD OF
THE PEOPLE’S REPUBLIC OF CHINA
ICS 21.060.10
J 13
Replacing GB/T 5781-2000
Hexagon head bolts - Full thread - Product grade C
(ISO 4018.2011, Hexagon head screws - Product grade C, MOD)
六角头螺栓 全螺纹 C级
ISSUED ON. FEBRUARY 24, 2016
IMPLEMENTED ON. JUNE 1, 2016
Issued by. General Administration of Quality Supervision, Inspection
and Quarantine;
Standardization Administration Committee.
Table of Contents
Foreword ... 3 
1 Scope ... 6 
2 Normative references ... 6 
3 Terms and definitions ... 7 
4 Technical conditions and references ... 13 
5 Marks ... 13 
Foreword
This Standard is one of one of the national standards of "Hexagon head bolts".
This series of standards include.
- GB/T 27, Hexagon fit shank bolts
- GB/T 28, Hexagon fit shank bolts with split pin hole on shank
- GB/T 29.1, Hexagon bolts with slot on head - Product grade A and B
- GB/T 29.2, Hexagon bolts with cross recess on head
- GB/T 31.1, Hexagon bolts with split pin hole on shank - Product grade A
and B
- GB/T 31.2, Hexagon bolts with split pin hole on shank - Reduced shank
- Product grade B
- GB/T 31.3, Hexagon bolts with split pin hole on shank - Fine pitch
thread - Product grade A and B
- GB/T 5780, Hexagon Head Bolts - Product grade C
- GB/T 5781, Hexagon head bolts - Full thread - Product grade C
- GB/T 5782, Hexagon Head Bolts
- GB/T 5783, Hexagon Head Bolts - Full Thread
- GB/T 5784, Hexagon head bolts; Reduced shank - Product grade B
- GB/T 5785, Hexagon head bolts with fine pitch thread
- GB/T 5786, Hexagon head bolts with fine pitch thread - Full thread
This Standard was drafted in accordance with the rules given in GB/T
1.1-2009.
This Standard replaces GB/T 5781-2000 Hexagon head bolts - Full thread -
Product grade C. Compared with GB/T 5781-2000, the main technical
modifications are as follows.
- deleted “if other technical requirements are required..., select between
GB/T 3098.1 and GB/T 3103.1” (Clause 1 of Edition 2000);
- uniformed thread references as GB/T 193, GB/T 9145 (Clause 2);
- deleted that the type of pocket allowed to be manufactured is selected
by the manufacturer (Figure 1);
- deleted grade 3.6 (Table 3);
- added that steel bolts non-electrolytic zinc coating technical
requirements are according to GB/T 5267.2 (Table 3).
This Standard uses redrafting method to modify and adopt ISO 4018.2011
Hexagon head screws -- Product grade C (English version).
The technical differences as well as reasons between this Standard and ISO
4018.2011 are as follows.
- deleted the provisions of ISO 4018 “for other technical requirements,
select between ISO 965-1 and ISO 4759-1” (clause 1) because it does
not belong to the content specified in this Standard;
- in normative references, used China national standards to replace the
International standards (Clause 2); added GB/T 5780 (Clause 1), GB/T
90.2 (Table 3), GB/T 193 (Table 3), GB/T 9145 (Table 3) and GB/T 1237
(5.1) as references; deleted ISO 724, ISO 965-1 as references so as to
be in line with China's basic standards for fasteners;
- added packaging technical requirements (Table 3) so as to be in line
with China's basic standards for fasteners;
- modified the marking example as simplified marking example (5.2) so
as to comply with the provisions of GB/T 1237.
This Standard also made the following editorial modifications.
- modified the standard’s name;
- deleted the Bibliography provided by ISO 4018.
This Standard was proposed by China Machinery Industry Federation.
This Standard shall be under the jurisdiction of National Technical Committee
on Fasteners of Standardization Administration of China (SAC/TC 85).
Main drafting organization of this Standard. China Machine Productivity
Promotion Center.
The drafting organizations of this Standard. Zhejiang Haili Co., Ltd., Wenzhou
Shun Tak Power Accessories Co., Ltd.
This Standard shall be interpreted by National Fastener Standardization
Technical Committee Secretariat.
Hexagon head bolts - Full thread - Product grade C
1 Scope
This Standard specifies the type sizes, technical conditions and marks of
grade C of full thread hexagon head bolts.
This Standard is applicable to hexagon head bolts of which thread sizes are
M5 ~ M64, full thread, performance grades are 4.6 and 4.8, product grade is
C.
NOTE In addition that this product is made as full thread, the rest are same with GB/T 5780.
2 Normative references
The following referenced documents are indispensable for the application of
this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including
any amendments) applies.
GB/T 90.1, Fasteners - Acceptance inspection (GB/T 90.1-2002, ISO
3269.2000, IDT)
GB/T 90.2, Fasteners - Marking and packaging
GB/T 193, Common thread - Diameter and pitch series (GB/T 193-2003,
ISO 261.1998, MOD)
GB/T 1237, Designation system for fasteners (GB/T 1237-2000, eqv ISO
8991.1986)
GB/T 3098.1, Mechanical Properties of Fasteners - Bolts, Screws and
Studs (GB/T 3098.1-2010, ISO 898-1.2009, MOD)
GB/T 3103.1, Essential oils and aromatic extracts - Determination of
residual benzene content (GB/T 3103.1-2002, idt ISO 4759-1.2000)
GB/T 5267.1, Fasteners - Electroplated Coatings (GB/T 5267.1-2002, ISO
4042.1999, IDT)
GB/T 5267.2, Fasteners - Non-electrolytically applied zinc flake coatings
(GB/T 5267.2-2002, ISO 10683.2000, IDT)
GB/T 5276, Fasteners - Bolts, screws, studs and nuts - Symbols and
descriptions of dimensions (GB/T 5276-2015, ISO 225.2010, MOD)
GB/T 5780, Hexagon Head Bolts - Product Grade C (GB/T 5780-2016, ISO
4016.2011, MOD)
GB/T 9145, General purpose metric screw threads - Limits of sizes for the
screw threads of medium quality and preferable plan (GB/T 9145-2003,
ISO 965-2.1998, MOD)
GB/T 16938, Fasteners - General requirements for bolts screws studs and
nuts (GB/T 16938-2008, ISO 8992.2005, IDT)
3 Terms and definitions
See Figure 1, Table 1 and Table 2 for type sizes of bolts.
The size codes and markings shall comply with GB/T 5276.