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GB/T 845-2017 English PDF (GBT845-2017)

GB/T 845-2017 English PDF (GBT845-2017)

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GB/T 845-2017: Cross-recessed pan head tapping screws

This Standard specifies the type and dimension, technical conditions and marking of cross-recessed pan head tapping screws. This Standard is applicable to the cross-recessed pan head tapping screws with Thread Specification of ST 2.2 ~ ST 9.5, and Product Grade A.
GB/T 845-2017
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 21.060.10
J 13
Replacing GB/T 845-1985
Cross-Recessed Pan Head Tapping Screws
(ISO 7049.2011, MOD)
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ISSUED ON. JULY 12, 2017
IMPLEMENTED ON. FEBRUARY 1, 2018
Issued by. General Administration of Quality Supervision, Inspection and Quarantine;
Standardization Administration of PRC.
3. No action is required - Full-copy of this standard will be automatically and immediately delivered to your EMAIL address in 0~60 minutes.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative References ... 5
3 Type and Dimension ... 6
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 845-1985 Cross-Recessed Pan Head Tapping Screws; compared with GB/T 845-1985, 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 Pan Head Tapping Screws
1 Scope
This Standard specifies the type and dimension, technical conditions and marking of cross-recessed pan head tapping screws.
This Standard is applicable to the cross-recessed pan 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 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 5267.2-2002, ISO 10683.2000, IDT)

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