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QC/T 870-2022: Double end studs bm=1.25d Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid QC/T 870: Historical versions
QC/T 870-2022: Double end studs bm=1.25d---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/QCT870-2022QC AUTOMOBILE INDUSTRY STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 43.040 CCS T 33 Replacing QC/T 870-2011 Double end studs bm = 1.25d 双头螺柱 bm = 1.25d ISSUED ON: APRIL 08, 2022 IMPLEMENTED ON: OCTOBER 01, 2022 Issued by: Ministry of Industry and Information Technology of PRC Table of ContentsForeword ... 6 1 Scope ... 7 2 Normative references ... 7 3 Terms and definitions ... 8 4 Types and sizes ... 8 5 Technical conditions ... 11 6 Product number ... 12ForewordThis document was in accordance with the requirements of GB/T 1.1-2020 "Directives for standardization - Part 1: Rules for the structure and drafting of standardizing documents". This document replaces QC/T 870-2011 "Double end studs bm = 1.25d". Compared with QC/T 870-2011, except for editorial modifications, the main changes are as follows: - CHANGE the limit deviation of "l" in the dimension from "jsl7" to "js15" (see Table 2); - CHANGE the limit deviation of ds from "h14" to "h13" (see Table 2); - CHANGE the limit deviation of bm from "jsl7" to "js16" (see Table 2); - CHANGE the product grade of tolerance, in specification, from "B" to "A" (see Table 3); - ADD the "zinc-nickel alloy" to the surface treatment type; CANCEL the oxidation (see Table 3) - ADD the zinc-aluminum coating; ADOPT the standard "QC/T 721" (see Table 3). This document was proposed by AND shall be under the jurisdiction of the National Automotive Standardization Technical Committee (SAC/TC 114). Drafting organizations of this document: Shanghai Dongfeng Motor Special Parts Co., Ltd., Dongfeng Motor Group Co., Ltd., Dongfeng Commercial Vehicle Co., Ltd. The main drafters of this document: Xiong Yaping, Li Yurong, Cao Yanli. This standard replaces the standard previously issued as follows: - It was first published as QC/T 870-2011 in 2011; - This is the first revision. Double end studs bm = 1.25d1 ScopeThis document specifies the type, size, technical conditions of double end studs bm = 1.25d. This document is applicable to double end studs for automobiles, whose thread at the screw-in base end is ordinary coarse thread, transition fit thread, ordinary fine thread (thread specification is greater than M16), AND the thread at the screw-in nut end is ordinary coarse thread and ordinary fine thread.2 Normative referencesThe contents of the following documents constitute the essential provisions of this document through normative references in the text. Among them, for dated references, only the version corresponding to the date is applicable to this document; for undated references, the latest version (including all amendments) is applicable to this document. GB/T 2 Fasteners - Ends of parts with external thread GB/T 90.1-2002 Fasteners - Acceptance inspection GB/T 90.2-2002 Fasteners - Marking and packaging GB/T 196 General purpose metric screw threads - Basic dimensions GB/T 197 General purpose metric screw threads - Tolerances GB/T 1167 The threads for transition fit GB/T 3098.1-2010 Mechanical properties of fasteners - Bolts, screws and studs GB/T 3103.1-2002 Essential oils and aromatic extracts - Determination of residual benzene content GB/T 5779.1-2000 Fasteners - Surface discontinuities - Bolts, screws and studs for general requirements GB/T 30512 Requirements for prohibited substances on automobiles QC/T 326 Coding rules for automotive standardized parts ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. |
