QC/T 870-2022 English PDF (QCT870-2022)

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QC/T 870-2022: Double end studs bm=1.25d
QC/T 870-2022
QC
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 Contents
Foreword ... 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 ... 12
Foreword
This 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 = 1.25d
1 Scope
This 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 references
The 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