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GB/T 823-2016 English PDF (GBT823-2016)

GB/T 823-2016 English PDF (GBT823-2016)

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GB/T 823-2016: Small pan head screws with cross recess

This Standard specifies the type and dimension, technical conditions and markings of small pan head screws with cross recess. This Standard is applicable to the small pan head screws with cross recess for Thread Specification M2~M8, Property Class 4.8, A1-50, C4-50, Product Grade A.
GB/T 823-2016
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 21.060.10
J 13
GB/T 822-2016
Replacing GB/T 823-1988
Small Pan Head Screws with Cross Recess
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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 ... 5
2 Normative References ... 5
3 Dimension ... 6
4 Technical Conditions and Reference Standards ... 8
5 Markings ... 9
Foreword
This Standard is one of the serial national standards of ?€?Slotted Screws and Cross Recessed Screws?€?, which include.
--- GB/T 65 Slotted Cheese Head Screws;
--- GB/T 67 Slotted Pan Head Screws;
--- GB/T 68 Slotted Countersunk Head Screws;
--- GB/T 69 Slotted Raised Countersunk Head Screws;
--- GB/T 818 Cross Recessed Pan Head Screws;
--- GB/T 819.1 Cross Recessed Countersunk Head Screws ?€? Part 1. Class 4.8; --- GB/T 819.2 Cross Recessed Countersunk Head Screws ?€? Part 2. Steel of Property Class 8.8, Stainless Steel Screws and Non-ferrous Metal Screws; --- GB/T 820 Cross Recessed Raised Countersunk Head Screws;
--- 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 823-1988 Small Pan Head Screws with Cross Recess; compared with GB/T 823-1988, this Standard has the major technical changes as follows.
--- Increase the steel screws non-electrolytically applied zinc flake coating technical requirements as per GB/T 5267.2 (see Table 2);
--- Increase the stainless-steel screws passivation treatment technical requirements as per GB/T 5267.4 (see Table 2).
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 Small Pan Head Screws with Cross Recess
1 Scope
This Standard specifies the type and dimension, technical conditions and markings of small pan head screws with cross recess.
This Standard is applicable to the small pan head screws with cross recess for Thread Specification M2~M8, Property Class 4.8, A1-50, C4-50, 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 90.2 Fasteners ?€? Marking and Packaging
GB/T 193 General Purpose Screw Threads ?€? Diameters and Pitches
GB/T 944.1 Cross Recesses for Screws
GB/T 1237 Designation System for Fasteners
GB/T 3098.1 Mechanical Properties of Fasteners - Bolts, Screws and Studs GB/T 3098.6 Mechanical Properties of Fasteners ?€? Stainless Steel Bolts, Screws and Studs
GB/T 3103.1 Tolerances for Fasteners ?€? Bolts, Screws and Nuts
GB/T 5267.1 Fasteners ?€? Electroplated Coatings
GB/T 5267.2 Fasteners ?€? Non-Electrolytically Applied Zinc Flake Coatings GB/T 5267.4 Passivation of Corrosion ?€? Resistant Stainless ?€? Steel Fasteners GB/T 5276 Fasteners - Bolts, Screws, Studs and Nuts - Symbols and Descriptions of Dimensions
Tolerance Product Grade A Standard GB/T 3103.1
Cross recess GB/T 944.1
Surface defects GB/T 5779.1 --- ---
Surface treatment
Untreated.
Electroplating
technical
requirements refer to
GB/T 5267.1;
non-electrolytically
applied zinc flake
coating technical
requirements refer to
GB/T 5267.2
Simplified treatment.
Passivation treatment technical
requirements refer to GB/T 5267.4
If other technical requirements and surface treatment are needed,
it shall be negotiated between purchaser and supplier
Acceptance and package GB/T 90.1, GB/T 90.2
5 Markings
5.1 Marking method
The marking method shall conform to the provisions of GB/T 1237.
5.2 Marking example
The marking of small pan head screws with cross recess for Thread Specification M5, Nominal Length l=20mm, Property Class 4.8, Type-H cross recess, untreated surface, and Product Grade A is shown as follows.
Screw GB/T 823 M5??20

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