QC/T 266-2025 English PDF
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QC/T 266: Historical versions
| Standard ID | USD | BUY PDF | Delivery | Standard Title (Description) | Status |
| QC/T 266-2025 | 230 | Add to Cart | Auto, 9 seconds. | General principles of general tolerances for automotive parts | Valid |
| QC/T 266-1999 | 249 | Add to Cart | 3 days | Extreme deviation for undeclared tolerance size of automobile parts - General requirements |
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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/QCT266-2025QC AUTOMOTIVE INDUSTRY STANDARD ICS 43.020 CCS T 04 Replacing QC/T 266-1999 General principles of general tolerances for automotive parts Issued on: MAY 09, 2025 Implemented on: NOVEMBER 01, 2025 Issued by. Ministry of Industry and Information Technology of the People's Republic of China
Table of Contents
Foreword... 3 1 Scope... 5 2 Normative references... 5 3 Terms and definitions... 6 4 General provisions... 6Foreword
This document was drafted in accordance with the rules given in GB/T 1.1-2020 "Directives for standardization - Part 1.Rules for the structure and drafting of standardizing documents". This document replaces QC/T 266-1999 "Extreme deviation for undeclared tolerance size of automobile parts - General requirements". Compared with QC/T 266-1999, apart from structural adjustments and editorial changes, the main technical changes are as follows. - Modified the scope of application (see Chapter 1 of this Edition; Chapter 1 of Edition 1999); - Modified the terms and definitions (see Chapter 3 of this Edition; Chapter 2 of Edition 1999); - Deleted the content related to "inspection of the limit deviations for dimensions without specified tolerances" (see 3.2 of Edition 1999); - Deleted the content related to "when using a universal measuring tool with an accuracy of 0.1 mm" (see 3.3 of Edition 1999); - Deleted the content related to "it shall be noted in the technical requirements column on the part drawings or assembly drawings of automobiles" (see 3.7 of Edition 1999); - Modified the content related to "the permissible value of wall thickness variation due to single-sided machining for sand-cast parts" (see 4.3 of this Edition; 3.5 of Edition 1999); - Modified the content related to "allowing thinning of the wall thickness when drilling holes in protrusions, lugs, flanges, brackets, etc. of castings and forgings" (see 4.4 of this Edition; 3.6 of Edition 1999); - Added general tolerance requirements for automotive machined parts, automotive cold-stamped parts, automotive cast parts, automotive steel forging parts, automotive molded plastic parts, and automotive welded parts (see 4.5, 4.6, 4.7, 4.8, 4.9, 4.10 of this Edition); - Added geometric tolerance requirements (see 4.11 of this Edition). Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. The issuing authority shall not be held responsible for identifying any or all such patent rights. General principles of general tolerances for automotive parts1 Scope
This document specifies the general tolerance technical specifications for automotive parts. This document applies to the general dimensional tolerances required in automotive product parts drawings. It also applies to the general dimensional tolerances required for post-assembly machining of assemblies. This document does not apply to dimensions that are affected by cumulative tolerances after assembly, reference dimensions, geometric dimensions, dimensions of heat- treated and coated areas, profile dimensions, dimensions of highly elastic spring parts, inter-process dimensions, and coordinate dimensions.2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. GB/T 1184, Geometrical tolerancing. Geometrical tolerance for features without individual tolerance indications GB/T 1800.1, Geometrical product specifications (GPS) -- ISO code system for tolerances on linear sizes -- Part 1.Basis of tolerances, deviations and fits GB/T 13916, Unnoted tolerance of shape and position for stamping parts QC/T 267, Extreme deviation for undeclared tolerance size of automobile machining parts QC/T 268, Permissible automobile cold stamping variations in dimensions without tolerance indication QC/T 269, Limit deviation of dimensions of automobile parts without tolerance indicated QC/T 270, Permissible variations in dimensions without tolerance indication for steel die forgings of automobile made by vertical press forging process ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
