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QC/T 266-2025 English PDF

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QC/T 266-2025: General principles of general tolerances for automotive parts
Status: Valid

QC/T 266: Evolution and historical versions

Standard ID	Contents [version]	USD	STEP2	[PDF] delivered in	Standard Title (Description)	Status	PDF
QC/T 266-2025	English	219	Add to Cart	3 days [Need to translate]	General principles of general tolerances for automotive parts	Valid	QC/T 266-2025
QC/T 266-1999	English	249	Add to Cart	3 days [Need to translate]	Extreme deviation for undeclared tolerance size of automobile parts - General requirements		QC/T 266-1999

Basic data

Standard ID	QC/T 266-2025 (QC/T266-2025)
Description (Translated English)	General principles of general tolerances for automotive parts
Sector / Industry	Automobile & Vehicle Industry Standard (Recommended)
Classification of Chinese Standard	T04
Classification of International Standard	43.020
Word Count Estimation	10,190
Date of Issue	2025-05-09
Date of Implementation	2025-11-01
Older Standard (superseded by this standard)	QC/T 266-1999
Issuing agency(ies)	Ministry of Industry and Information Technology of the People's Republic of China

QC/T 266-2025: General principles of general tolerances for automotive parts

---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/QCT266-2025
Automobile Industry Standards of the People's Republic of China General tolerance technical specifications for automotive parts Replaces QC/T 266-1999 2025-05-09 Release 2025-11-01 Implementation CCS T 04 ICS 43.020 Ministry of Industry and Information Technology of the People's Republic of China issued Preface III 1 Scope 1 2 Normative references 1 3 Terms and Definitions 1 4 General Provisions 1

Preface This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1.Structure and drafting rules for standardization documents" Drafting. This document replaces QC/T 266-1999 "General requirements for limit deviations of untoleranced dimensions of automotive parts" and is in compliance with QC/T 266-1999. In addition to structural adjustments and editorial changes, the main technical changes are as follows. --The scope of application has been changed (see Chapter 1, Chapter 1 of the.1999 edition); -- Changed "Terms and Definitions" (see Chapter 3, Chapter 2 of the.1999 edition); -- Deleted the content related to "Checking the limit deviation of untoleranced dimensions" (see 3.2 of the.1999 edition); -- Deleted the content related to "when measuring with a universal measuring instrument with an accuracy of 0.1 mm" (see 3.3 of the.1999 edition); -- Deleted the content related to "the technical requirements column should be indicated on the parts drawing or assembly drawing of the vehicle" (see 3.7 of the.1999 edition); -- Changed the content related to "For sand casting parts, the allowable value of wall thickness variation due to single-sided processing" (see 4.3, 3.5 of the.1999 edition); -- Changed the content related to "The wall thickness of holes drilled on the bosses, lugs, flanges, brackets, etc. of castings and forgings may be reduced" (see 4.4, 3.6 of the.1999 edition); --Added automobile cutting parts, automobile cold stamping parts, automobile casting parts, automobile steel die forging parts, automobile molding General tolerance requirements for plastic parts and automotive welded parts (see 4.5, 4.6, 4.7, 4.8, 4.9, 4.10); --Added geometric tolerance requirements (see 4.11). Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents. This document was proposed and coordinated by the National Technical Committee for Automotive Standardization (SAC/TC114). This document was drafted by. Pan Asia Technical Automotive Center Co., Ltd., FAW Jiefang Automobile Co., Ltd., Shenzhen Aviation Standard Parts Co., Ltd., Dongfeng Peugeot Citroen Automobile Co., Ltd. The main drafters of this document are. Wang Lixin, Hu Min, Zhao Hongbo, Zhou Xiaozhen, Sun Chao, Zhao Zhe, and Xiong Biyun. The previous versions of this document and the documents it replaces are as follows. --First published in.1999 as QC/T 226-1999; --This is the first revision. General tolerance technical specifications for automotive parts 1 Scope This document specifies general tolerance specifications for automotive parts. This document applies to the general tolerance dimensions in the drawings of automotive parts, and also applies to the general tolerance dimensions after assembly and reprocessing. Require. This document does not apply to dimensions, reference dimensions, geometric dimensions, heat treatment and coating areas that are affected by tolerance accumulation after assembly. Dimensions, profile dimensions, high-elasticity spring part dimensions, process dimensions, coordinate dimensions. 2 Normative references The contents of the following documents constitute the essential clauses of this document through normative references in this document. For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to this document. document. GB/T 1184 Tolerances on shape and position without tolerance value GB/T 1800.1 Geometrical Product Specifications (GPS) - ISO code system for linear dimension tolerances - Part 1.Tolerances, deviations and The basis of cooperation GB/T 13916 Stamping parts, shape and position, without tolerances QC/T 267 Limit deviations of untoleranced dimensions of automotive machined parts QC/T 268 Limit deviations of untoleranced dimensions of automotive cold stamping parts QC/T 269 Limit deviations of untoleranced dimensions of automotive casting parts QC/T 270 Limit deviations of uninjected tolerance dimensions for vertical steel die forgings for automobiles QC/T 714 Geometric Tolerances for Automobile Body Metal Coverings QC/T 29017 Limit deviations of untoleranced dimensions of automotive molded plastic parts QC/T 29087 Limit deviations of untoleranced dimensions of automotive welded parts 3 Terms and Definitions The terms and definitions defined in GB/T 1800.1 apply to this document. 4 General Provisions 4.1 For parts that require systematic inspection, even if the allowable deviation value is greater than or equal to the value specified in this document, the deviation value should be noted in the drawing. 4.2 The limit deviation of the dimensions between two surfaces obtained by two different processes shall be determined according to the dimensional deviation of the process with lower precision. 4.3 For sand-cast parts, the allowable values of wall thickness variation due to single-sided machining are shown in Table 1.

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