GB/T 68-2016 English PDF (GBT68-2016)

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GB/T 68-2016: Slotted countersunk flat head screws
GB/T 68-2016
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 21.060.10
J 13
Replacing GB/T 68-2000
Slotted Countersunk Flat Head Screws
(ISO 2009.2011, Slotted Countersunk
Flat Head Screws – Product Grade A, MOD)
开槽沉头螺钉
ISSUED ON. FEBRUARY 24, 2016
IMPLEMENTED ON. JUNE 1, 2016
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 6
2 Normative References ... 6
3 Dimension ... 7
4 Technical Conditions and Reference Standards ... 9
5 Markings ... 10
Foreword
This Standard is one of the serial national standards of “Slotted Screws and Cross
Recess Screws”, such series include.
--- GB/T 65 Slotted Cheese Head Screws;
--- GB/T 67 Slotted Pan Head Screws;
--- GB/T 68 Slotted Countersunk Flat Head Screws;
--- GB/T 69 Slotted Raised Countersunk Head Screws;
--- GB/T 818 Pan Head Screws with Cross Recess;
--- GB/T 819.1 Countersunk Flat Head Screws with Cross Recess – Part 1. Property
Class 4.8;
--- GB/T 819.2 Countersunk Flat Head Screws with Cross Recess – Part 2. Property
Class 8.8, Stainless Steel Screws and Non-Ferrous Metal Screws;
--- GB/T 820 Raised Countersunk Head Screws with Cross Recess;
--- GB/T 822 Cross Recessed Cheese Head Screws;
--- GB/T 823 Cross Recessed Small Pan Head Screws;
--- GB/T 13806.1 Fasteners for Fine Mechanics - Cross Recessed Screws.
This Standard was drafted as per the rules specified in GB/T 1.1-2009.
This Standard replaced GB/T 68-2000 Slotted Countersunk Flat Head Screws;
compared with GB/T 68-2000, this Standard has the major technical changes as
follows.
--- Delete “if other technical requirements are needed, ... selection in GB/T 3098.10
and GB/T 3103.1” (Chapter 1 in 2000 Edition);
--- Unify the reference thread standards into GB/T 193, GB/T 9145 (see Chapter 2);
--- Add “d< 3mm, as per agreement” to the property class of steel and nonferrous
screws (see Table 2);
--- Add the steel screws non--electrolytically applied zinc flake coating technical
requirements as per GB/T 5267.2 (see Table 2);
--- Add the stainless-steel screws passivation treatment technical requirements as
per GB/T 5267.4 (see Table 2);
--- Add the non-ferrous metal screws electroplating technical requirements as per
GB/T 5267.1 (see Table 2).
This Standard adopts re-drafting method to modify and use ISO 2009.2011 Slotted
Countersunk Flat Head Screws – Product Grade A (English Edition).
The technical differences and causes between this Standard and ISO 2009.2011
are as follows.
--- Delete ISO 2009 provisions. “if other technical requirements are needed, ...
selection in ISO 4759-1” (Chapter 1), which doesn’t belong to the contents of this
Standard;
--- In the normative references, use national standards to replace the international
standards (Chapter 2); add the reference of GB/T 5279 (Table 1), GB/T 90.2
(Table 2), and GB/T 1237 (5.1); so that conform to China’s fastener basic
standard;
--- Add steel and non-ferrous metal screws property class of “d< 3mm, as per
agreement” (table 2), expand the applicable scope of the standard;
--- Add the non-ferrous metal screws property class (Table 2); expand the applicable
scope of the standard;
--- Add the packaging technical requirements (Table 2); so that conform to China’s
fastener basic standard;
--- Modify the marking examples into simplified marking examples (5.2); so that
conform to the provisions of GB/T 1237.
This Standard also has the following editorial changes.
--- Modify the standard name;
--- Delete the bibliography of ISO 2009.
This Standard was proposed by China Machinery Industry Federation.
This Standard shall be under the jurisdiction of National Technical Committee for
Standardization of Fastener (SAC/TC 85).
Drafting organizations of this Standard. China Productivity Center for Machinery.
Participating drafting organizations of this Standard. Machinery Industry General Parts
Product Quality Supervision and Testing Center, and Ningbo Zhongji Machinery Parts
Testing Co., Ltd.
This Standard shall be interpreted by the Secretariat of National Technical Committee
Slotted Countersunk Flat Head Screws
1 Scope
This Standard specifies the type and dimension, technical conditions and marks of
slotted countersunk flat head screws.
This Standard is applicable to the slotted countersunk flat head screws with Thread
Specification M1.6~M10, Property Class 4.8, 5.8, A2-50, A2-70, CU2, CU3, and AL4,
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 90.1 Fasteners – Acceptance Inspection (GB/T 90.1-2002, idt ISO
3269.2000, IDT)
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, IDT)
GB/T 3098.6 Mechanical Properties of Fasteners – Stainless Steel Bolts, Screws
and Studs (GB/T 3098.6-2000, ISO 3506-1.2009, MOD)
GB/T 3098.10 Mechanical Properties of Fasteners –Bolts, Screws and Studs
Made of Non-Ferrous Metals (GB/T 3908.10-1993, 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