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GB/T 819.2-2016 English PDF (GBT819.2-2016)

GB/T 819.2-2016 English PDF (GBT819.2-2016)

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GB/T 819.2-2016: Countersunk flat head screws with cross recess -- Part 2: Property class 8.8, stainless steel screws and non-ferrous metal screws

This Standard specifies the terms and definitions, principle, apparatus and materials, test pieces, procedure, expression of results, test errors and test report for the determination of the bulk density, apparent porosity and true porosity of dense shaped refractory products.
GB/T 819.2-2016
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 21.060.10
J 13
Replacing GB/T 819.2-1997
Countersunk Flat Head Screws with Cross Recess ?€?
Part 2. Property Class 8.8, Stainless Steel Screws and
Non-Ferrous Metal Screws
[ISO 7046-2.2011, Countersunk Flat Head Screws (Common Head Style) with Type H or Type Z Cross Recess ?€? Product Grade A ?€? Part 2. Steel Screws of Property Class 8.8, Stainless Steel Screws and Non-Ferrous Metal Screws, MOD]
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 ... 10
5 Markings ... 11
Foreword
This Part 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 Part was drafted as per the rules specified in GB/T 1.1-2009.
This Part replaced GB/T 819.2-1997 Countersunk Flat Head Screws with Cross Recess ?€? Part 2. Steel Property Class 8.8, Stainless Steel A2-70 and Non-Ferrous Metal CU2 or CU3; compared with GB/T 819.2-1997, the major technical changes are as follows.
--- Delete ?€?if under special conditions, the technical conditions specified beyond this Standard, ... GB 3106 and GB 9145?€? (Chapter 1 of 1997 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 Countersunk Flat Head Screws with Cross Recess ?€?
Part 2. Property Class 8.8, Stainless Steel Screws and
Non-Ferrous Metal Screws
1 Scope
This Part of GB/T 819 specifies the type and dimension, technical conditions and markings of stainless steel and non-ferrous metal countersunk flat head screws with cross recess and property class 8.8.
This Part is applicable to Type-H and Type-Z countersunk flat head screws with cross recess for Thread Specification M2~M10, Property Class 8.8, A2-70, CU2, CU3, 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)
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 5279 Countersunk Head Screws - Head Configuration and Gauging (GB/T 5279-1985, idt ISO 7721.1983)
GB/T 5279.2 Countersunk Flat Head Screws - Part 2. Penetration Depth of Cross Recesses (GB/T 5279.2-1997, idt ISO 7721-2.1990)
GB/T 5779.1 Fastener ?€? Surface Discontinues ?€? 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 type and dimension of screws can refer to Figure 1 and Table 1.
The dimension codes and markings shall conform to GB/T 5276.
The shank diameter of the part without thread equals to the medium diameter of thread or allows equaling to the large diameter of thread.
Screw GB/T 819.2 M5??20
If insert depth series are needed to designate, the type and series number of cross recess shall be indicated in the marking, e.g.. Type-H, Series 1.
Screw GB/T 819.2 M5??20 H1

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