GB/T 70.4-2015 English PDF (GBT70.4-2015)

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GB/T 70.4-2015: Hexagon socket button head screws with collar
GB/T 70.4-2015
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 21.060.10
J 13
Hexagon Socket Button Head Screws with Collar
(ISO 7380-2.2011, Button Head Screws – Part 2. Hexagon Socket Button
Head Screws with Collar, MOD)
内六角平圆头凸缘螺钉
ISSUED ON. DECEMBER 10, 2015
IMPLEMENTED ON. JANUARY 1, 2017
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative References ... 5
3 Dimension ... 6
4 Technical Conditions and Reference Standards ... 10
5 Markings ... 11
Foreword
The serial national standards of GB/T 70 “Internal Wrenching Screws (Hexagon
Socket Part)” include.
--- GB/T 70.1 Hexagon Socket Head Cap Screws;
--- GB/T 70.2 Hexagon Socket Button Head Screws;
--- GB/T 70.3 Hexagon Socket Countersunk Head Screws;
--- GB/T 70.4 Hexagon Socket Button Head Screws with Collar;
--- GB/T 5281 Hexagon Socket Head Shoulder Screws.
This Part belongs to Part 4 of GB/T 70.
This Part was drafted as per the rules specified in GB/T 1.1-2009.
This Part adopts re-drafting method to modify and use ISO 7380-2. 2011 Button Head
Screws – Part 2. Hexagon Socket Button Head Screws with Collar (English Edition).
Compared with ISO 7380-2.2011, this Part has the major changes as follows.
--- In the normative references, use national standards to replace the international
standards (see Chapter 2);
--- Since the description of “Property Class” and “Marking Code” of the screws reducing
the carrying capacity in ISO 7380-2 is wrong, which is not adopted in this Part (see
Chapter 4 and Chapter 5);
--- This Part specifies the package technical requirements, which are not specified in
ISO 7380-2 (see Table 2);
--- This Part specifies the surface oxidation treatment, which is not specified in ISO
7380-2 (see Table 2, 5.2);
--- This Part gives the simplified marking example, while ISO 7380-2 doesn’t specify
the simplified marking (see 5.2).
This Part was proposed by China Machinery Industry Federation.
This Part shall be under the jurisdiction of National Technical Committee for
Standardization of Fastener (SAC/TC 85).
Drafting organizations of this Part. China Productivity Center for Machinery.
Participating drafting organizations of this Part. Ningbo Jinding Fastening Piece Co.,
Hexagon Socket Button Head Screws with Collar
1 Scope
This Part of GB/T 70 specifies the type and dimension, technical conditions and
markings of hexagon socket button head screws with collar for Thread Specification
M3~M16, Property Class 08.8, 010.9, Product Grade A, and the carrying capacity is
reduced as per Table 3.
This Part is applicable to the hexagon socket button head screws with collar that are
screwed into the internal threads of the machine by using an Allen key.
2 Normative References
The following documents are essential to the application of this document. For the
dated documents, only the versions with the dates indicated are applicable to this
document; for the undated documents, only the latest version (including all the
amendments) are applicable to this document.
GB/T 2 Fasteners - Ends of Parts with External Thread (GB/T 2-2001, idt ISO
4753.1999)
GB/T 70.5 Gauging of Hexagon Sockets (GB/T 70.5-2008, ISO 23429.2004, IDT)
GB/T 90.1 Fasteners – Acceptance Inspection (GB/T 90.1-2002, idt ISO
3269.2000)
GB/T 90.2 Fasteners – Marking and Packaging
GB/T 193 General Purpose Screw Threads – Diameters and Pitches (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 Tolerances for Fasteners – Bolts, Screws and Nuts (GB/T 3103.1-
2002, ISO 4759-1.2000, IDT)
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 5276-1985, eqv ISO 225.1983)
GB/T 5779.1 Fasteners - Surface Discontinuities - Bolts, Screws and Studs for
General Requirements (GB/T 5779.1-2000, idt ISO 6157-1.1988)
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 Dimension
The types and dimensions of screws can refer to Figure 1 and Table 1.
The dimension codes and markings shall conform to GB/T 5276.
5.2 Marking example
The marking of hexagon socket button head screws with collar for Thread Specification
M12, Nominal Length l=40mm, Property Class 08.8, untreated surface, Product Grade
A is shown as follows.
Screw GB/T 70.4 M12×40