GB/T 818-2016 English PDF (GBT818-2016)

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GB/T 818-2016: Pan head screws with cross recess
GB/T 818-2016
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 21.060.10
J 13
Replacing GB/T 818-2000
Pan Head Screws with Cross Recess
(ISO 7045.2011, Pan Head Screws with Type H or Type Z Cross Recess –
Product Grade A, MOD)
十字槽盘头螺钉
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 818-2000 Pan Head Screws with Cross Recess;
compared with GB/T 818-2000, the major technical changes are as follows.
--- Delete “if other technical requirements are needed, ... selection in GB/T 3098.6
and GB/T 3098.10” (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 non-ferrous
metal 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 the re-drafting method to modify and use ISO 7045.2011 Pan
Head Screws with Type H or Type Z Cross Recess – Product Grade A (English Edition).
The technical differences and causes between this Standard and ISO 7045.2011 are
as follows.
--- Don’t adopt ISO 7045 provision. “if other technical requirements are needed, ...
the selection in ISO 965-2 and ISO 3506-1” (Chapter 1), which doesn’t belong to
the content of this Standard;
--- In the normative references, use national standards to replace the international
standards (Chapter 2); add the reference of GB/T 90.2 (Table 2), GB/T 1237 (5.1);
so that conform to China’s fastener basic standard;
--- Add the property class of steel and non-ferrous metal screws of “d< 3mm, as per
agreement” (Table 2); expand the applicable scope of this Standard;
--- Add the property class of non-ferrous metal screws (Table 2), expand the
applicable scope of this 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 7045.
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 Inspection Center, and Ningbo Zhongji Machine Parts
Inspection Co., Ltd..
This Standard shall be interpreted by the Secretariat of National Technical Committee
for Standardization of Fastener.
Pan Head Screws with Cross Recess
1 Scope
This Standard specifies the type and dimension, technical conditions and markings of
pan head screw with cross recess.
This Standard is applicable to the Type H and Type Z pan head screws with cross
recess for Thread Specification M1.6~M10, Property Class 4.8, A2-50, A2-70, CU2,
CU3 and AL4, 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, 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 944.1 Cross Recesses for Screws (GB/T 944.1-1985, eqv ISO 4757.1983)
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 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)