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GB/T 846-2017: Cross-recessed countersunk (flat) head tapping screws Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid GB/T 846: Historical versions
GB/T 846-2017: Cross-recessed countersunk (flat) head tapping screws---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT846-2017GB 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. 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 ContentsForeword... 3 2 Normative References... 5 4 Technical Conditions and Reference Standards... 9 5 Markings... 9ForewordThis 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 ReferencesThe 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 ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. |
