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GB/T 846-2017

Chinese Standard: 'GB/T 846-2017'
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Detail Information of GB/T 846-2017; GB/T846-2017
Description (Translated English): Cross-recessed countersunk(flat) head tapping screws
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: J13
Classification of International Standard: 21.060.10
Word Count Estimation: 6,634
Date of Issue: 2017-07-12
Date of Implementation: 2018-02-01
Drafting Organization: China Machine Productivity Promotion Center
Administrative Organization: National Fastener Standardization Technical Committee (SAC/TC 85)
Proposing organization: China Machinery Industry Federation
Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine of the People Republic of China, China National Standardization Administration Committee

GB/T 846-2017
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 21.060.10
J 13
Replacing GB/T 846-1985
Cross-Recessed
Countersunk (Flat) Head Tapping Screws
(ISO 7050.2011, MOD)
十字槽沉头自攻螺钉
ISSUED ON. JULY 12, 2017
IMPLEMENTED ON. FEBRUARY 1, 2018
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of PRC.
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Table of Contents
Foreword ... 3
2 Normative References ... 5
4 Technical Conditions and Reference Standards ... 9
5 Markings ... 9
Foreword
This Standard is one of the serial national standards of “Tapping Screws”, such series
include.
--- GB/T 845 Cross-Recessed Pan Head Tapping Screws;
--- GB/T 846 Cross-Recessed Countersunk (Flat) Head Tapping Screws;
--- GB/T 847 Cross-Recessed Raised Countersunk Head Tapping Screws;
--- GB/T 2670.1 Hexalobular Socket Pan Head Tapping Screws;
--- GB/T 2670.2 Hexalobular Socket Countersunk Head Tapping Screws;
--- GB/T 2670.3 Hexalobular Socket Raised Countersunk (Oval) Head Tapping
Screws;
--- GB/T 5282 Slotted Pan Head Tapping Screws;
--- GB/T 5283 Slotted Countersunk Head Tapping Screws;
--- GB/T 5284 Slotted Raised Countersunk Head Tapping Screws;
--- GB/T 5285 Hexagon Head Tapping Screws;
--- GB/T 9456 Cross-Recessed Hexagon Head Tapping Screws with Indentation;
--- GB/T 13806.2 Fasteners for Fine Mechanics – Cross-Recessed Tapping Screws
– Scrape Point;
--- GB/T 16824.1 Hexagon Head Tapping Screws with Collar;
--- GB/T 16824.2 Hexagon Flange Head Tapping Screws.
This Standard was drafted as per the rules specified in GB/T 1.1-2009.
This Standard replaced GB/T 846-1985 Cross-Recessed Countersunk (Flat) Head
Tapping Screws; compared with GB/T 846-1985, this Standard has the major technical
changes as follows.
--- Increased Type-R (see Figure 1 and Table 1);
--- Add general technical conditions as per GB/T 16938 (see Clause 2, Table 2);
--- For steel screws, add the untreated and non-electrolytically applied zinc flake
coating technical requirements as per GB/T 5267.2 (see Table 2);
Cross-Recessed
Countersunk (Flat) Head Tapping Screws
1 Scope
This Standard specifies the type and dimension, technical conditions and marking of
cross-recessed countersunk (flat) head tapping screws.
This Standard is applicable to the cross-recessed countersunk (flat) head tapping
screws with Thread Specification of ST 2.2 ~ ST 9.5, 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)
GB/T 90.2 Fasteners – Marking and Packaging
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 3098.5 Mechanical Properties of Fasteners -Tapping Screws (GB/T 3098.5-
2016, ISO 2702.2011, MOD)
GB/T 3098.21......
Related standard:   GB/T 845-2017  GB/T 847-2017
   
 
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