GB/T 2672-2017 English PDF (GBT2672-2017)

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GB/T 2672-2017: Hexalobular socket pan head screws
GB/T 2672-2017
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 21.060.10
J 13
Replacing GB/T 2672-2004
Hexalobular Socket Pan Head Screws
(ISO 14583.2011, MOD)
内六角花形盘头螺钉
ISSUED ON. JULY 12, 2017
IMPLEMENTED ON. FEBRUARY 1, 2018
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of PRC.
3. No action is required - Full-copy of this standard will be automatically and
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Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative References ... 5
3 Type and Dimension ... 6
4 Technical Conditions and Reference Standards ... 9
5 Marking ... 10
Foreword
This Standard is one of the serial national standards of “Hexalobular Socket Screws”,
which include.
--- GB/T 2671.1 Hexalobular Socket Cheese (Short) Head Screws
--- GB/T 2671.2 Hexalobular Socket Head Cap Screws
--- GB/T 2672 Hexalobular Socket Pan Head Screws
--- GB/T 2673 Hexagon Lobular Socket Countersunk Head Screws
--- GB/T 2674 Hexagon Lobular Socket Raised Countersunk Head Screws
This Standard was drafted as per the rules specified in GB/T 1.1-2009.
This Standard replaced GB/T 2672-2004 Hexalobular Socket Pan Head Screws;
compared with GB/T 2672-2004, this Standard has the major technical changes as
follows.
--- Delete “If other technical requirements are needed, ... the selection in GB/T
3098.6 and GB/T 3103.1).” (see Clause 1 of 2004 Edition);
--- Add “the acceptance and inspection of hexalobular socket can refer to GB/T 6188”
(see Table 1);
--- Add the passivation treatment technical requirements against the stainless-steel
screws as per GB/T 5267.4 (see Table 2).
This Standard adopts re-drafting method to modify and use ISO 14583.2011
Hexalobular Socket Pan Head Screws.
The technical differences and causes between ISO 14583.2011 and this Standard are
as follows.
--- Delete ISO 14583 provisions “if other technical requirements are needed, ...the
selection in ISO 4759-1.” (see Clause 1); which doesn’t belong to the contents
of this Standard;
--- In the Normative References, use national standards replace the international
standards (see Clause 2); increase the quotation of GB/T 2 (see Figure 1), GB/T
90.2 (see Table 2), GB/T 1237 (see 5.1) and GB/T 5267.4 (see Table 2), so that
conform to China’s basic standards on fasteners;
--- Add the steel and non-ferrous metal screws’ property class “d< 3mm; as per
agreement” (see Table 2); confirm the provisions on the property class of small
Hexalobular Socket Pan Head Screws
1 Scope
This Standard specifies the type and dimension, technical conditions, and marking of
hexalobular socket pan head screws.
This Standard is applicable to the hexalobualr socket pan head screws with Thread
Specification M2~M10, Property Class 4.8, A2-70, A3-70, CU2 and CU3, and Product
Grade A.
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 2-2016, ISO
4753.2011, MOD)
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 Metric Screw Threads – General Plan (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 3098.6 Mechanical Properties of Fasteners – Stainless-Steel Bolts, Screws
and Studs (GB/T 3098.6-2014, ISO 3506-1.2009, MOD)
GB/T 3098.10 Mechanical Properties of Fasteners – Bolts, Screws, Studs and
Nuts Made of Non-Ferrous Metals (GB/T 3098.10-1993, eqv ISO 8839.1986)
GB/T 3103.1 Tolerances for Fasteners – Bolts, Screws and Nuts (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 5267.4 Passivation of Corrosion – Resistant Stainless – Steel Fasteners
(GB/T 5267.4-2009, ISO 16048.2003, 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 5779.1 Fasteners – Surface Discontinuities -Bolts, Screws and Nuts for
General Requirements (GB/T 5779.1-2000, idt ISO 6157-1.1988)
GB/T 6188 Hexalobular Internal Driving Feature for Bolts and Screws (GB/T 6188-
2000, idt ISO 10664.1999)
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 Type and Dimension
The type and dimension of screws can refer to Figure 1 and Table 1.
The dimension code and marking shall conform to GB/T 5276.