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GB/T 42124.3-2025: Geometrical product specifications (GPS) - Dimensional and geometrical tolerances for moulded parts - Part 3: General dimensional and geometrical tolerances and machining allowances for castings
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Geometrical product specifications (GPS) - Dimensional and geometrical tolerances for moulded parts - Part 3: General dimensional and geometrical tolerances and machining allowances for castings
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GB/T 42124.3-2025
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Basic data | Standard ID | GB/T 42124.3-2025 (GB/T42124.3-2025) | | Description (Translated English) | Geometrical product specifications (GPS) - Dimensional and geometrical tolerances for moulded parts - Part 3: General dimensional and geometrical tolerances and machining allowances for castings | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | J31 | | Classification of International Standard | 17.040.10 | | Word Count Estimation | 46,414 | | Date of Issue | 2025-05-30 | | Date of Implementation | 2025-12-01 | | Older Standard (superseded by this standard) | GB/T 6414-2017 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 42124.3-2025: Geometrical product specifications (GPS) - Dimensional and geometrical tolerances for moulded parts - Part 3: General dimensional and geometrical tolerances and machining allowances for castings
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ICS 17.040.10
CCSJ31
National Standard of the People's Republic of China
Replaces GB/T 6414-2017
Geometric Product Specifications (GPS) for molded parts
Dimensional and geometrical tolerances Part 3.Dimensions of castings
Tolerances, geometrical tolerances and machining allowances
Published on May 30, 2025, implemented on December 1, 2025
State Administration for Market Regulation
The National Standardization Administration issued
Table of contents
Preface III
Introduction V
1 Scope 1
2 Normative references 1
3 Terms and Definitions 1
4 Abbreviations 3
5 Draft Angle 4
6 Draft Angle Value 5
7 Tolerance Grade 8
8 Misplaced box (SMI) 12
9 Wall thickness tolerance 12
10 Machining allowance (RMA) 12
11 Marking on the drawing 16
12 Rejection 17
Appendix A (Informative) Comparison table of structure numbers between this document and ISO 8062-3.2023 18
Appendix B (Informative) Technical differences between this document and ISO 8062-3.2023 and their causes 20
Appendix C (Informative) Casting Dimensional Tolerances and Geometric Tolerances 21
Appendix D (Informative) Application of General Geometric Tolerances to Castings 24
Appendix E (Informative) General Geometric Tolerances 31
Appendix F (Informative) Selection of Machining Allowance Grade (RMAG) 34
Appendix G (Informative) GPS-related benchmark models 35
Reference 36
Foreword
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 is Part 3 of GB/T 42124 Geometrical Product Specifications (GPS) - Dimensions and geometrical tolerances of mouldings.
GB/T 42124 has published the following parts.
--- Part 1.Vocabulary;
--- Part 3.Dimensional tolerances, geometrical tolerances and machining allowances of castings.
This document replaces GB/T 6414-2017 "Dimensional tolerances, geometrical tolerances and machining allowances for castings" and GB/T 6414-
Compared with.2017, in addition to structural adjustments and editorial changes, the main technical changes are as follows.
a) The scope of application has been changed (see Chapter 1, Chapter 1 of the.2017 edition);
b) Added the terms and definitions of “external draft angle” and “internal draft angle” (see 3.2 and 3.3);
c) The definitions of the terms “casting dimensional tolerance”, “misalignment” and “machining allowance” have been changed (see 3.5, 3.6 and 3.7,.2017 edition).
3.2, 3.3 and 3.4);
d) Dimensioning has been deleted (see Chapter 4 of the.2017 edition);
e) The tilt element has been deleted (see Chapter 5 of the.2017 edition);
f) The abbreviations have been changed (see Chapter 4, Chapter 6 of the.2017 edition);
g) Added draft angle and draft angle value (see Chapter 5 and Chapter 6);
h) The casting dimension tolerance grade has been changed (see 7.2, 7.2 of the.2017 edition);
i) The geometric tolerance grade of castings has been changed (see 7.3, 7.3 of the.2017 edition);
j) The provisions on wall thickness tolerance have been changed (see Chapter 9, Chapter 9 of the.2017 edition);
k) Added rejection requirements (see Chapter 12).
This document is modified to adopt ISO 8062-3.2023 "Geometrical Product Specifications (GPS) Dimensional and geometrical tolerances of mouldings Part 3
Division. General dimensional tolerances and general geometrical tolerances and machining allowances of castings marked with /-dimensional tolerances.
Compared with ISO 8062-3.2023, this document has more structural adjustments. The structural number changes between the two documents are shown in the table below.
See Appendix A.
This document has many technical differences compared to ISO 8062-3.2023.
A single line (|) is used to indicate these technical differences. A list of these technical differences and their reasons is given in Appendix B.
The following editorial changes were made to this document.
--- In order to coordinate with the existing standard name, the standard name is changed to "Product Geometric Specification (GPS) Dimensions and Geometry of Molded Parts
Tolerances Part 3.Dimensional tolerances, geometrical tolerances and machining allowances for castings
--- Changed the notes of 3.2 and 3.3 (merged into the notes of 3.3);
--- Added the content of the note in Table 7;
--- Added Appendix A (informative) Comparison table of structure numbers between this document and ISO 8062-3.2023, Appendix B (informative)
The technical differences between the document and ISO 8062-3.2023 and their reasons;
--- Deleted the informative Appendix C of ISO 8062-3.2023;
--- Changed the data in Table C.1 and Table C.2 in Appendix C; the notes and footnotes in Table C.1, Table C.2 and Table C.3 were changed to clauses (see
C.2.2, C.3.2, C.3.3, C.5.2 and C.5.3);
--- Changed references.
Please note that some of the contents in this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents.
This document is proposed and coordinated by the National Casting Standardization Technical Committee (SAC/TC54).
This document was drafted by. China Machinery Engineering Institute Group Shenyang Foundry Research Institute Co., Ltd., CSSC Shuangrui (Luoyang) Special Equipment Co., Ltd.
Company, CRRC Qishuyan Locomotive and Rolling Stock Technology Research Institute Co., Ltd., AECC Harbin Dongan Engine Co., Ltd., Shanghai Steam Turbine
Machinery Factory Co., Ltd., Zhejiang Wanfeng Motorcycle Co., Ltd., Zhejiang Qicheng Aluminum Co., Ltd., Anhui Yongcheng Machinery Co., Ltd., Guangdong Hongtu Technology
Co., Ltd., FAW Foundry Co., Ltd., Dongfeng Electronic Technology Co., Ltd. Wuhan Branch, SAIC Volkswagen Automotive Co., Ltd., Hangzhou
Hangzhou Oxygen Foundry Co., Ltd., Harbin Large Electric Motor Research Institute Co., Ltd., China Railway Baoqiao Group Co., Ltd., Tianrun Industrial Technology Co., Ltd.
Company, Sun Moon Heavy Industry Co., Ltd., Tongyu Heavy Industry Co., Ltd., Shandong Tianli Machinery Casting Co., Ltd., Yantai Xingchuang Auto Parts
Co., Ltd., Botou Yaqi Casting Co., Ltd., Guangdong Hongtu Wuhan Die Casting Co., Ltd., Hangzhou Steam Turbine Casting and Forging Co., Ltd., Jiangsu Wan
Hengxin Materials Technology Co., Ltd., Changluo (Liaocheng) Intelligent Manufacturing Co., Ltd., Xinjiang Xinlü Aluminum Co., Ltd., Wuxi Yoshioka Precision Technology Co., Ltd.
Co., Ltd., Shandong Weihe Transmission Co., Ltd., Sanming Yijun Machinery Casting Co., Ltd., Shanghai Jiaotong University, Foshan Vocational and Technical
College, Tongling University, Hubei Gucheng County Donghua Machinery Co., Ltd., Huizhou Jinzhu Equipment Casting Co., Ltd., Dongguan Bilian Machinery Technology
Co., Ltd., Fengyang ALS Light Alloy Precision Forming Co., Ltd., Shanxi Ruige Metal New Materials Co., Ltd., Zhejiang Suijin Special Casting Co., Ltd.
Limited Company, Chongqing Chaoqun Industrial Co., Ltd., Chongqing Shijia Precision Technology Co., Ltd., Hebei Kama Hydraulic Machinery Co., Ltd., Chongqing
Jinshili Aviation Materials Co., Ltd., Shandong Zhongli High Pressure Valve Co., Ltd., Binzhou Rude Crankshaft Co., Ltd., Guizhou Aerospace Wind
Hua Precision Equipment Co., Ltd., Meike (Guangzhou) New Materials Co., Ltd., Fuxin Lida Steel Casting Co., Ltd., Aisidi (Tianjin) Automotive
Auto Parts Co., Ltd., Nanjing Ruishi Intelligent Safety Technology Co., Ltd., Ningbo Lane Machinery Manufacturing Co., Ltd., Zhejiang Anji Huayi Technology
Co., Ltd., Zhejiang Wanxi Precision Casting Co., Ltd., Hangzhou Geely Machinery Co., Ltd., Changzhou Kaidu Electromechanical Co., Ltd., Zhejiang Focheng Refrigeration
Co., Ltd., Zhuhai Nante Metal Technology Co., Ltd., Shenzhen Hantai Precision Machinery Co., Ltd., Hangzhou Yongjun Intelligent Equipment Co., Ltd.
Company, Zhejiang Wanneng Spring Machinery Co., Ltd., Zhejiang Junhong Machinery Co., Ltd., Zhejiang Jiahong Sports Equipment Co., Ltd., Qingzhou Junkai Machinery
Industrial Equipment Co., Ltd., Shandong Yibaitong Machinery Co., Ltd., Hubei Jiutian Motorcycle Parts Co., Ltd., Hubei Sanhuan Casting Co., Ltd.
Company, Cangzhou Shengshi Weiye Machinery Equipment Manufacturing Co., Ltd., Sike Intelligent Hardware (Shaoxing) Co., Ltd., Chongqing Taicang Technology Co., Ltd., Su
Zhejiang Haoxin Precision Technology Co., Ltd., Zhejiang Wujing Machinery Manufacturing Co., Ltd., Ningbo Fenghua Bolong Machinery Manufacturing Co., Ltd., Hebei Henggong
Precision Equipment Co., Ltd., Jiangsu Kate Auto Parts Co., Ltd., Changzhou Hansen Machinery Co., Ltd., Changzhou Sawiri Casting Technology Co., Ltd.
Technology Co., Ltd., Hebei Xingsheng Machinery Co., Ltd., Taizhou Ruida Machinery Co., Ltd., Jiangsu Maixinlin Aviation Technology Co., Ltd.,
CHE YONGJI ELECTRICAL ENGINEERING CO., LTD.
The main drafters of this document are. Zhang Yin, Wu Tieming, Liu Yufu, Jin Li, Cong Jianchen, Guo Xingchun, Liu Zhifa, Chen Yatao, Yang Zhaoling, Lu Shiping,
Wang Qingyu, Wu Senqi, Liu Dongmei, Wu Baojian, Cao Qiao, Yu Jichang, Zhu Yue, Wang Donghong, Hu Zhongchao, Zhu Zhengfeng, Wu Haibin, Guo Delong, Wang Lilin,
Fan Jiajian, Yang Zhisen, Liu Yuanyi, Zhang Jiaqi, Mao Chengrong, Liu Hua, Lin Shuying, Ruan Jiangang, Li Baijin, Tan Honggang, Yuan Yaoyao, Yu Jianjun,
Wang Jinghui, Li Chunliang, Feng Xingping, Yang Mingjun, Xie Laiwang, Zhao Yang, Zhou Yan, Fu Yingjie, Wang Jianguo, Zhang Jianxiong, Chen Xiulin, Li Xihua, Zhang Lingfeng,
Wang Junlan, Zhang Peipei, Wu Yingxue, Zhang Jianqing, Hu Weiquan, Jiang Hong, Ding Changqing, He Jincheng, Zhang Youzhi, Xu Tao, Zhang Chenggen, Liu Jingjing, Yu Xiangfei,
Fei Peng, He Baican, Shen Zhongjian, Duan Xianwei, Wu Qianghong, Jin Da, He Xiaofeng, Huang Xiangyang, Shi Tiantian, Shan Jibin, Xuan Hongzheng, Lu Weilong, Wang Xinwei,
Qin Tong, Zhuang Xu, Yu Xun, Xiao Gang, Wei Zhiyong, Kong Xiangjian, Zhu Min, Su Xinchang, Du Qiang, Zhang Peigen, Bai Jinyang, Zhou Zhiqiang, Xu Jian, Xia Hongbo,
Liu Yongna, Zuo Lijuan, Zheng Bingcheng, Teng Zonglong, Zhang Zhifeng, Wang Shufeng.
The previous versions of this document and the documents it replaces are as follows.
---First published as GB/T 6414-1986 in 1986, first revised in.1999, second revised in.2017;
--- This is the third revision. As a partial standard GB/T 42124.3, GB/T 42124 "Technical Specification for Product Geometry" is incorporated.
(GPS) is one of the standards in the series "Dimensional and Geometrical Tolerances of Moulded Parts".
Introduction
In order to make the geometric technical specifications of our country's molded parts dimensions and geometric tolerances better consistent with the latest ISO GPS,
To promote foreign exchanges, cooperation and trade of my country's molded parts enterprises, this document is consistent with the name of the GB/T 42124 series of national standards.
GB/T 42124 "Geometric Product Specification (GPS) Dimensions and Geometric Tolerances of Moulded Parts" is intended to consist of four parts, each of which is related to
They are interrelated yet independent and together constitute the dimensions and geometric tolerances of molded parts.
--- Part 1.Vocabulary. Aims to define the terms and definitions used to describe features, shapes and types of tolerances when tolerances are given on mouldings.
definition.
--- Part 2.Rules. Aims to give the geometric tolerance marking rules for final molded parts and machined molded parts.
--- Part 3.Dimensional tolerances, geometrical tolerances and machining allowances for castings. Aims to specify the general dimensions of castings delivered to the buyer
and geometric tolerances, as well as machining allowance grades.
--- Part 4.General tolerances for castings using profile tolerances relative to a general reference system. This is intended to give
A method of marking the general geometric tolerances of castings using profile tolerances while retaining the general datum system on the workpiece.
Intended to specify machining allowances and draft angles for castings of all foundry metals and their alloys formed by various manufacturing processes.
This document is modified to adopt ISO 8062-3.2023, in order to convert the ISO 8062 series standards into GB/T 42124 "Product Geometry Technology"
The names and numbers of the series of national standards for the dimensions and geometric tolerances of molded parts (GPS) are consistent with those of the national product geometric technical standards.
The standard name "Casting Dimension Tolerance, Geometric Tolerance and Machining Allowance" was changed to "Product
Geometrical specifications (GPS) Dimensional and geometrical tolerances of mouldings Part 3.Dimensional tolerances, geometrical tolerances and machining allowances for castings
The standard number GB/T 6414 was changed to GB/T 42124.3.
Geometric Product Specifications (GPS) for molded parts
Dimensional and geometrical tolerances Part 3.Dimensions of castings
Tolerances, geometrical tolerances and machining allowances
1 Scope
This document specifies the draft angle, draft value, tolerance grade, misalignment, wall thickness tolerance, machining allowance, and
Requirements for marking and rejection.
This document applies to castings produced by various casting processes using /- dimensional tolerances.
2 Normative references
The contents of the following documents constitute 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.
GB/T 131 Product Geometry Specification (GPS) - Method of representation of surface structure in technical product documents (GB/T 131-2006,
ISO 1302.2002, IDT)
GB/T 1182 Product Geometric Specification (GPS) Geometric Tolerances Shape, Orientation, Position and Runout Tolerances (GB/T 1182-
2018,ISO 1101.2017,MOD)
GB/T 4458.4 Dimensioning Methods for Mechanical Drawings
GB/T 5611 Casting Terminology
GB/T 24744 Product geometry specification (GPS) - Representation of moulded parts in technical product documents (TPD) (GB/T 24744-
2009,ISO 10135.2007,IDT)
GB/T 42124.1 Geometrical Product Specifications (GPS) Dimensions and geometrical tolerances of mouldings Part 1.Vocabulary
(GB/T 42124.1-2022,ISO 8062-1.2007, MOD)
1) ISO 1302 has been obsoleted and replaced by ISO 21920-1.There is no technical difference in the referenced content.
3 Terms and definitions
The terms and definitions defined in GB/T 5611 and GB/T 42124.1 and the following apply to this document.
3.1
Draft Angle
Draft angle taper
In order to make it easier to remove the mold or core pattern from the casting mold or core box, a slope is reserved on the pattern or core box wall parallel to the demolding direction.
3.2
External draft angle
The slope on the outer surface of the pattern parallel to the demolding direction.
|