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GB/T 20331-2025: Machine taper 1∶50 pin reamers with parallel shanks
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Std ID	Version	USD	Buy	Deliver [PDF] in	Title (Description)
GB/T 20331-2025	English	199	Add to Cart	3 days [Need to translate]	Machine taper 1∶50 pin reamers with parallel shanks
GB/T 20331-2006	English	139	Add to Cart	2 days [Need to translate]	Machine taper 1: 50 pin reamers with parallel shanks

GB/T 20331-2025: Machine taper 1∶50 pin reamers with parallel shanks

---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 25.100.30 CCSJ41 National Standards of the People's Republic of China Replaces GB/T 20331-2006 1.50 taper pin reamer for straight shank machine 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 20331-2006 "1.50 Tapered Pin Reamers for Straight Shank Machines". Compared with GB/T 20331-2006, except for... Aside from structural adjustments and editorial changes, the main technical changes are as follows. a) The style and size have been changed (see Chapter 4, Chapter 4 of the.2006 edition); b) The tagging has been changed (see Chapter 5, 4.2 of the.2006 edition); c) The technical requirements have been changed (see Chapter 6, Chapter 5 of the.2006 edition); d) A new chapter on “Logos and Packaging” has been added (see Chapter 7). This document is modified to adopt ISO 3466.2016 "Tapered pin reamers for straight shank machines". Compared with ISO 3466.2016, this document has undergone the following structural adjustments. ---A chapter on "Terms and Definitions" has been added; ---Chapter 4 corresponds to Chapters 1, 3, and 4 of ISO 3466.2016, where 4.1 corresponds to Chapter 1 of ISO 3466.2016. The third and fourth paragraphs of Chapter 4 and Chapter 4.2 correspond to Chapter 3 of ISO 3466.2016; ---Chapters 5 through 7 have been added. The technical differences between this document and ISO 3466.2016, and the reasons therefor, are as follows. ---The design drawing has been modified, and dimensions d3 and y1 have been removed (see Figure 1 and Table 1) to better suit domestic production practices; ---ISO 4203 (see 4.2) has been replaced with the normatively referenced GB/T 1442 to meet domestic usage requirements; ---Added "Marking" (see Chapter 5), "Technical Requirements" (see Chapter 6), and "Marking and Packaging" (see Chapter 7) to comply with domestic use. need. The following editorial changes have been made to this document. ---To align with existing standards, the standard name has been changed to "1.50 Tapered Pin Reamer for Straight Shank Machines"; ---Informative references to ISO 2339, ISO 3465, and ISO 3467 (see Chapter 1) have been removed. 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. Sichuan Tianhu Tools Co., Ltd., Guohong Tool Systems (Wuxi) Co., Ltd., and Chengdu Tool Research Institute. Co., Ltd., Ningbo Sanhan Alloy Materials Co., Ltd. The main drafters of this document are. Liu Qianlun, Zhang Jibo, Xu Gang, Chen Wenlang, Wang Biyong, Luo Liang, Zhao Jun, Li Zhi, and Liu Wenju. This document was first published in.2006, and this is its first revision. 1.50 taper pin reamer for straight shank machine

1 Scope

This document specifies the type, dimensions, markings, and technical requirements of 1.50 taper pin reamers (hereinafter referred to as "pin reamers") for straight shank machines. Requirements, logos, and packaging. This document applies to the manufacture of pin reamers with diameters of 2mm to 12mm.

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 1442 Dimensions of drive tails and sleeves for straight shank tools (GB/T 1442-2004, ISO 4203.1978, MOD)

3 Terms and Definitions

This document does not contain any terms or definitions that need to be defined. 4.Types and Sizes 4.1 The chip groove may be made into a straight groove or a left-hand spiral groove, at the manufacturer's discretion. Unless otherwise specified, the pin reamer shall be made for right-hand cutting. The type of sub-reamer is shown in Figure 1, and its dimensions conform to the specifications in Table 1. The relationship between the symbols in this document and those in ISO 13399 (all parts) is given in Appendix A. a) Spiral groove Figure 1 Pin Reamer ...