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GB/T 28253: Historical versions
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Thread forming tap
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| GB/T 28253-2012 | English | 399 |
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Basic data
| Standard ID | GB/T 28253-2025 (GB/T28253-2025) |
| Description (Translated English) | Thread forming tap |
| Sector / Industry | National Standard (Recommended) |
| Classification of Chinese Standard | J41 |
| Classification of International Standard | 25.100.50 |
| Word Count Estimation | 26,275 |
| Date of Issue | 2025-10-31 |
| Date of Implementation | 2026-05-01 |
| Older Standard (superseded by this standard) | GB/T 28253-2012 |
| Issuing agency(ies) | State Administration for Market Regulation, Standardization Administration of China |
GB/T 28253-2025: Thread forming tap
---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
ICS 25.100.50
CCSJ41
National Standards of the People's Republic of China
Replaces GB/T 28253-2012
Extrusion taps
Published on 2025-10-31
Implemented on May 1, 2026
State Administration for Market Regulation
The State Administration for Standardization issued a statement.
Foreword
This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1.Structure and Drafting Rules of Standardization Documents".
Drafting.
This document replaces GB/T 28253-2012 "Extrusion Taps". Compared with GB/T 28253-2012, the main differences are structural adjustments and editorial changes.
Aside from the changes, the main technical changes are as follows.
a) The scope of application has been changed (see Chapter 1, Chapter 1 of the.2012 edition);
b) The dimensions of the tap thread section have been increased (see Tables 1 and 2);
c) The tap type diagram has been revised (see Figures 1-3, Figures 1-3 in the.2012 version);
d) Added tap thread types (see 4.3);
e) Added marking requirements for extrusion taps (see 4.4) and changed the marking example (see 4.4, 3.7 of the.2012 edition);
f) The content regarding non-molar taps has been deleted (see section 3.4, Tables 8-10, and 5.5 in the.2012 edition);
g) Increased the dimensional tolerance limits of precision taps (see 5.2);
h) The technical requirements for taps have been changed (see Tables 9, 10, 14 and 6.11; Tables 9, 10, 13 and 5.9 in the.2012 edition);
i) Tap materials have been removed (see 5.8 in the.2012 edition);
j) A chapter on "Detection Methods" has been added (see Chapter 7).
Please note that some content in this document may involve patents. The issuing organization of this document assumes no responsibility for identifying patents.
This document was proposed by the China Machinery Industry Federation.
This document is under the jurisdiction of the National Technical Committee on Standardization of Cutting Tools (SAC/TC91).
This document was drafted by. Changzhou Hengding Tools Manufacturing Co., Ltd., Shanghai Tool Factory Co., Ltd., Shanghai Cutting Tool Factory Co., Ltd., and Chengdu Xin
Chengliang Tools Co., Ltd., Jiangsu Shidai Jiangyu Cutting Tool Co., Ltd., Guangdong Dingtai High-Tech Technology Co., Ltd., Chengdu Tool Research Institute
Limited Company.
The main drafters of this document are. Jiang Xiangrong, He Jia, Xu Yingen, Yu Maodi, Zhao Quan, Dong Xiangyang, Wang Junfeng, Xiong Liehua, Cao Shiyi, and Jiang Zhengjian.
Xu Gang, Chen Wenlang, Zhang Ming, Ding Wei.
This document was first published in.2012, and this is its first revision.
Extrusion taps
1 Scope
This document specifies the types and dimensions of forming taps, thread tolerances, technical requirements, testing methods, marking, and packaging.
This document applies to machining ordinary threads with a nominal diameter of 1mm to 27mm on non-ferrous metal and low- to medium-strength ferrous metal parts.
Extrusion taps according to (GB/T 192, GB/T 193, GB/T 196, GB/T 197).
Note 1.For some explanations regarding tap thread tolerances, see Appendix A.
Note 2.See Appendix B for the dimensions of the pre-drilled threaded holes.
Note 3.The tap profile and grinding amount are shown in Appendix C.
Note 4.The relationship between this document and ISO 13399 (all parts) symbols is given in Appendix D.
2 Normative references
The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included.
For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies.
This document.
GB/T 4267 Dimensions of the shank diameter and drive square head of straight shank rotary tools
JB/T 10231.4 Testing Methods for Cutting Tools - Part 4.Taps
3 Terms and Definitions
This document does not contain any terms or definitions that need to be defined.
4.Types and Sizes
4.1 Coarse shank forming tap
4.1.1 A schematic diagram of a coarse shank flat neck extrusion tap is shown in Figure 1.The dimensions conform to the specifications in Tables 1 and 2.
Figure 1.Coarse shank flat neck extrusion tap
...
