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GB/T 846-2017 (GB/T846-2017)

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GB/T 846-2017: PDF in English (GBT 846-2017)

GB/T 846-2017
ICS 21.060.10
J 13
Replacing GB/T 846-1985
Countersunk (Flat) Head Tapping Screws
(ISO 7050.2011, MOD)
ISSUED ON. JULY 12, 2017
Issued by. General Administration of Quality Supervision, Inspection and
Standardization Administration of PRC.
3. No action is required - Full-copy of this standard will be automatically &
immediately delivered to your EMAIL address in 0~60 minutes.
Table of Contents
Foreword ... 3
2 Normative References ... 5
4 Technical Conditions and Reference Standards ... 9
5 Markings ... 9
This Standard is one of the serial national standards of “Tapping Screws”, such series
--- 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
--- 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);
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
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
GB/T 3098.5 Mechanical Properties of Fasteners -Tapping Screws (GB/T 3098.5-
2016, ISO 2702.2011, MOD)
GB/T 3098.21 Mechanical Properties of Fasteners – Stainless Steel Tapping
Screws (GB/T 3098.21-2014, ISO 3506-4.2008, MOD)
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
(Above excerpt was released on 2017-11-17, modified on 2021-06-07, translated/reviewed by: Wayne Zheng et al.)
Source: https://www.chinesestandard.net/PDF.aspx/GBT846-2017